tests

12 files changed, 1117 insertions, 121 deletions

diff --git a/tests/ui/transmutability/primitives/bool.stderr b/tests/ui/transmutability/primitives/bool.current.stderr
index 22decf15e54..999302224ee 100644
--- a/tests/ui/transmutability/primitives/bool.stderr
+++ b/tests/ui/transmutability/primitives/bool.current.stderr
@@ -1,12 +1,12 @@
 error[E0277]: `u8` cannot be safely transmuted into `bool` in the defining scope of `assert::Context`.
-  --> $DIR/bool.rs:22:35
+  --> $DIR/bool.rs:24:35
    |
 LL |     assert::is_transmutable::<u8, bool>();
    |                                   ^^^^ `u8` cannot be safely transmuted into `bool` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: true, validity: false }>` is not implemented for `bool`
 note: required by a bound in `is_transmutable`
-  --> $DIR/bool.rs:12:14
+  --> $DIR/bool.rs:14:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
diff --git a/tests/ui/transmutability/primitives/bool.next.stderr b/tests/ui/transmutability/primitives/bool.next.stderr
new file mode 100644
index 00000000000..999302224ee
--- /dev/null
+++ b/tests/ui/transmutability/primitives/bool.next.stderr
@@ -0,0 +1,19 @@
+error[E0277]: `u8` cannot be safely transmuted into `bool` in the defining scope of `assert::Context`.
+  --> $DIR/bool.rs:24:35
+   |
+LL |     assert::is_transmutable::<u8, bool>();
+   |                                   ^^^^ `u8` cannot be safely transmuted into `bool` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: true, validity: false }>` is not implemented for `bool`
+note: required by a bound in `is_transmutable`
+  --> $DIR/bool.rs:14:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context, { Assume::SAFETY }>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/transmutability/primitives/bool.rs b/tests/ui/transmutability/primitives/bool.rs
index eebb74fff47..de77cfc78aa 100644
--- a/tests/ui/transmutability/primitives/bool.rs
+++ b/tests/ui/transmutability/primitives/bool.rs
@@ -1,8 +1,10 @@
+// revisions: current next
+//[next] compile-flags: -Ztrait-solver=next
+
 #![crate_type = "lib"]
 #![feature(transmutability)]
 #![allow(dead_code)]
 #![allow(incomplete_features)]
-
 mod assert {
     use std::mem::{Assume, BikeshedIntrinsicFrom};
     pub struct Context;
diff --git a/tests/ui/transmutability/primitives/numbers.stderr b/tests/ui/transmutability/primitives/numbers.current.stderr
index c04a0e82aa2..bbf1f166999 100644
--- a/tests/ui/transmutability/primitives/numbers.stderr
+++ b/tests/ui/transmutability/primitives/numbers.current.stderr
@@ -1,12 +1,12 @@
 error[E0277]: `i8` cannot be safely transmuted into `i16` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:62:40
+  --> $DIR/numbers.rs:65:40
    |
 LL |     assert::is_transmutable::<   i8,   i16>();
    |                                        ^^^ `i8` cannot be safely transmuted into `i16` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i16`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -15,14 +15,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i8` cannot be safely transmuted into `u16` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:63:40
+  --> $DIR/numbers.rs:66:40
    |
 LL |     assert::is_transmutable::<   i8,   u16>();
    |                                        ^^^ `i8` cannot be safely transmuted into `u16` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u16`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -31,14 +31,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i8` cannot be safely transmuted into `i32` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:64:40
+  --> $DIR/numbers.rs:67:40
    |
 LL |     assert::is_transmutable::<   i8,   i32>();
    |                                        ^^^ `i8` cannot be safely transmuted into `i32` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i32`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -47,14 +47,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i8` cannot be safely transmuted into `f32` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:65:40
+  --> $DIR/numbers.rs:68:40
    |
 LL |     assert::is_transmutable::<   i8,   f32>();
    |                                        ^^^ `i8` cannot be safely transmuted into `f32` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f32`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -63,14 +63,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i8` cannot be safely transmuted into `u32` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:66:40
+  --> $DIR/numbers.rs:69:40
    |
 LL |     assert::is_transmutable::<   i8,   u32>();
    |                                        ^^^ `i8` cannot be safely transmuted into `u32` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u32`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -79,14 +79,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i8` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:67:40
+  --> $DIR/numbers.rs:70:40
    |
 LL |     assert::is_transmutable::<   i8,   u64>();
    |                                        ^^^ `i8` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -95,14 +95,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i8` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:68:40
+  --> $DIR/numbers.rs:71:40
    |
 LL |     assert::is_transmutable::<   i8,   i64>();
    |                                        ^^^ `i8` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -111,14 +111,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i8` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:69:40
+  --> $DIR/numbers.rs:72:40
    |
 LL |     assert::is_transmutable::<   i8,   f64>();
    |                                        ^^^ `i8` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -127,14 +127,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i8` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:70:39
+  --> $DIR/numbers.rs:73:39
    |
 LL |     assert::is_transmutable::<   i8,  u128>();
    |                                       ^^^^ `i8` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -143,14 +143,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i8` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:71:39
+  --> $DIR/numbers.rs:74:39
    |
 LL |     assert::is_transmutable::<   i8,  i128>();
    |                                       ^^^^ `i8` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -159,14 +159,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u8` cannot be safely transmuted into `i16` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:73:40
+  --> $DIR/numbers.rs:76:40
    |
 LL |     assert::is_transmutable::<   u8,   i16>();
    |                                        ^^^ `u8` cannot be safely transmuted into `i16` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i16`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -175,14 +175,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u8` cannot be safely transmuted into `u16` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:74:40
+  --> $DIR/numbers.rs:77:40
    |
 LL |     assert::is_transmutable::<   u8,   u16>();
    |                                        ^^^ `u8` cannot be safely transmuted into `u16` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u16`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -191,14 +191,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u8` cannot be safely transmuted into `i32` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:75:40
+  --> $DIR/numbers.rs:78:40
    |
 LL |     assert::is_transmutable::<   u8,   i32>();
    |                                        ^^^ `u8` cannot be safely transmuted into `i32` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i32`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -207,14 +207,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u8` cannot be safely transmuted into `f32` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:76:40
+  --> $DIR/numbers.rs:79:40
    |
 LL |     assert::is_transmutable::<   u8,   f32>();
    |                                        ^^^ `u8` cannot be safely transmuted into `f32` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f32`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -223,14 +223,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u8` cannot be safely transmuted into `u32` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:77:40
+  --> $DIR/numbers.rs:80:40
    |
 LL |     assert::is_transmutable::<   u8,   u32>();
    |                                        ^^^ `u8` cannot be safely transmuted into `u32` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u32`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -239,14 +239,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u8` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:78:40
+  --> $DIR/numbers.rs:81:40
    |
 LL |     assert::is_transmutable::<   u8,   u64>();
    |                                        ^^^ `u8` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -255,14 +255,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u8` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:79:40
+  --> $DIR/numbers.rs:82:40
    |
 LL |     assert::is_transmutable::<   u8,   i64>();
    |                                        ^^^ `u8` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -271,14 +271,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u8` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:80:40
+  --> $DIR/numbers.rs:83:40
    |
 LL |     assert::is_transmutable::<   u8,   f64>();
    |                                        ^^^ `u8` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -287,14 +287,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u8` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:81:39
+  --> $DIR/numbers.rs:84:39
    |
 LL |     assert::is_transmutable::<   u8,  u128>();
    |                                       ^^^^ `u8` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -303,14 +303,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u8` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:82:39
+  --> $DIR/numbers.rs:85:39
    |
 LL |     assert::is_transmutable::<   u8,  i128>();
    |                                       ^^^^ `u8` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -319,14 +319,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i16` cannot be safely transmuted into `i32` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:84:40
+  --> $DIR/numbers.rs:87:40
    |
 LL |     assert::is_transmutable::<  i16,   i32>();
    |                                        ^^^ `i16` cannot be safely transmuted into `i32` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i32`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -335,14 +335,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i16` cannot be safely transmuted into `f32` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:85:40
+  --> $DIR/numbers.rs:88:40
    |
 LL |     assert::is_transmutable::<  i16,   f32>();
    |                                        ^^^ `i16` cannot be safely transmuted into `f32` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f32`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -351,14 +351,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i16` cannot be safely transmuted into `u32` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:86:40
+  --> $DIR/numbers.rs:89:40
    |
 LL |     assert::is_transmutable::<  i16,   u32>();
    |                                        ^^^ `i16` cannot be safely transmuted into `u32` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u32`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -367,14 +367,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i16` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:87:40
+  --> $DIR/numbers.rs:90:40
    |
 LL |     assert::is_transmutable::<  i16,   u64>();
    |                                        ^^^ `i16` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -383,14 +383,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i16` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:88:40
+  --> $DIR/numbers.rs:91:40
    |
 LL |     assert::is_transmutable::<  i16,   i64>();
    |                                        ^^^ `i16` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -399,14 +399,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i16` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:89:40
+  --> $DIR/numbers.rs:92:40
    |
 LL |     assert::is_transmutable::<  i16,   f64>();
    |                                        ^^^ `i16` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -415,14 +415,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i16` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:90:39
+  --> $DIR/numbers.rs:93:39
    |
 LL |     assert::is_transmutable::<  i16,  u128>();
    |                                       ^^^^ `i16` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -431,14 +431,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i16` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:91:39
+  --> $DIR/numbers.rs:94:39
    |
 LL |     assert::is_transmutable::<  i16,  i128>();
    |                                       ^^^^ `i16` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -447,14 +447,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u16` cannot be safely transmuted into `i32` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:93:40
+  --> $DIR/numbers.rs:96:40
    |
 LL |     assert::is_transmutable::<  u16,   i32>();
    |                                        ^^^ `u16` cannot be safely transmuted into `i32` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i32`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -463,14 +463,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u16` cannot be safely transmuted into `f32` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:94:40
+  --> $DIR/numbers.rs:97:40
    |
 LL |     assert::is_transmutable::<  u16,   f32>();
    |                                        ^^^ `u16` cannot be safely transmuted into `f32` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f32`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -479,14 +479,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u16` cannot be safely transmuted into `u32` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:95:40
+  --> $DIR/numbers.rs:98:40
    |
 LL |     assert::is_transmutable::<  u16,   u32>();
    |                                        ^^^ `u16` cannot be safely transmuted into `u32` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u32`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -495,14 +495,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u16` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:96:40
+  --> $DIR/numbers.rs:99:40
    |
 LL |     assert::is_transmutable::<  u16,   u64>();
    |                                        ^^^ `u16` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -511,14 +511,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u16` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:97:40
+  --> $DIR/numbers.rs:100:40
    |
 LL |     assert::is_transmutable::<  u16,   i64>();
    |                                        ^^^ `u16` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -527,14 +527,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u16` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:98:40
+  --> $DIR/numbers.rs:101:40
    |
 LL |     assert::is_transmutable::<  u16,   f64>();
    |                                        ^^^ `u16` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -543,14 +543,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u16` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:99:39
+  --> $DIR/numbers.rs:102:39
    |
 LL |     assert::is_transmutable::<  u16,  u128>();
    |                                       ^^^^ `u16` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -559,14 +559,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u16` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:100:39
+  --> $DIR/numbers.rs:103:39
    |
 LL |     assert::is_transmutable::<  u16,  i128>();
    |                                       ^^^^ `u16` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -575,14 +575,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i32` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:102:40
+  --> $DIR/numbers.rs:105:40
    |
 LL |     assert::is_transmutable::<  i32,   u64>();
    |                                        ^^^ `i32` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -591,14 +591,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i32` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:103:40
+  --> $DIR/numbers.rs:106:40
    |
 LL |     assert::is_transmutable::<  i32,   i64>();
    |                                        ^^^ `i32` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -607,14 +607,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i32` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:104:40
+  --> $DIR/numbers.rs:107:40
    |
 LL |     assert::is_transmutable::<  i32,   f64>();
    |                                        ^^^ `i32` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -623,14 +623,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i32` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:105:39
+  --> $DIR/numbers.rs:108:39
    |
 LL |     assert::is_transmutable::<  i32,  u128>();
    |                                       ^^^^ `i32` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -639,14 +639,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i32` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:106:39
+  --> $DIR/numbers.rs:109:39
    |
 LL |     assert::is_transmutable::<  i32,  i128>();
    |                                       ^^^^ `i32` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -655,14 +655,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `f32` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:108:40
+  --> $DIR/numbers.rs:111:40
    |
 LL |     assert::is_transmutable::<  f32,   u64>();
    |                                        ^^^ `f32` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<f32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -671,14 +671,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `f32` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:109:40
+  --> $DIR/numbers.rs:112:40
    |
 LL |     assert::is_transmutable::<  f32,   i64>();
    |                                        ^^^ `f32` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<f32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -687,14 +687,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `f32` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:110:40
+  --> $DIR/numbers.rs:113:40
    |
 LL |     assert::is_transmutable::<  f32,   f64>();
    |                                        ^^^ `f32` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<f32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -703,14 +703,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `f32` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:111:39
+  --> $DIR/numbers.rs:114:39
    |
 LL |     assert::is_transmutable::<  f32,  u128>();
    |                                       ^^^^ `f32` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<f32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -719,14 +719,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `f32` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:112:39
+  --> $DIR/numbers.rs:115:39
    |
 LL |     assert::is_transmutable::<  f32,  i128>();
    |                                       ^^^^ `f32` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<f32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -735,14 +735,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u32` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:114:40
+  --> $DIR/numbers.rs:117:40
    |
 LL |     assert::is_transmutable::<  u32,   u64>();
    |                                        ^^^ `u32` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -751,14 +751,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u32` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:115:40
+  --> $DIR/numbers.rs:118:40
    |
 LL |     assert::is_transmutable::<  u32,   i64>();
    |                                        ^^^ `u32` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -767,14 +767,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u32` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:116:40
+  --> $DIR/numbers.rs:119:40
    |
 LL |     assert::is_transmutable::<  u32,   f64>();
    |                                        ^^^ `u32` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f64`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -783,14 +783,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u32` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:117:39
+  --> $DIR/numbers.rs:120:39
    |
 LL |     assert::is_transmutable::<  u32,  u128>();
    |                                       ^^^^ `u32` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -799,14 +799,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u32` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:118:39
+  --> $DIR/numbers.rs:121:39
    |
 LL |     assert::is_transmutable::<  u32,  i128>();
    |                                       ^^^^ `u32` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -815,14 +815,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u64` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:120:39
+  --> $DIR/numbers.rs:123:39
    |
 LL |     assert::is_transmutable::<  u64,  u128>();
    |                                       ^^^^ `u64` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u64, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -831,14 +831,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `u64` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:121:39
+  --> $DIR/numbers.rs:124:39
    |
 LL |     assert::is_transmutable::<  u64,  i128>();
    |                                       ^^^^ `u64` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<u64, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -847,14 +847,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i64` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:123:39
+  --> $DIR/numbers.rs:126:39
    |
 LL |     assert::is_transmutable::<  i64,  u128>();
    |                                       ^^^^ `i64` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i64, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -863,14 +863,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `i64` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:124:39
+  --> $DIR/numbers.rs:127:39
    |
 LL |     assert::is_transmutable::<  i64,  i128>();
    |                                       ^^^^ `i64` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<i64, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -879,14 +879,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `f64` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:126:39
+  --> $DIR/numbers.rs:129:39
    |
 LL |     assert::is_transmutable::<  f64,  u128>();
    |                                       ^^^^ `f64` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<f64, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
@@ -895,14 +895,14 @@ LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
 
 error[E0277]: `f64` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
-  --> $DIR/numbers.rs:127:39
+  --> $DIR/numbers.rs:130:39
    |
 LL |     assert::is_transmutable::<  f64,  i128>();
    |                                       ^^^^ `f64` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<f64, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
 note: required by a bound in `is_transmutable`
-  --> $DIR/numbers.rs:12:14
+  --> $DIR/numbers.rs:15:14
    |
 LL |     pub fn is_transmutable<Src, Dst>()
    |            --------------- required by a bound in this function
diff --git a/tests/ui/transmutability/primitives/numbers.next.stderr b/tests/ui/transmutability/primitives/numbers.next.stderr
new file mode 100644
index 00000000000..bbf1f166999
--- /dev/null
+++ b/tests/ui/transmutability/primitives/numbers.next.stderr
@@ -0,0 +1,915 @@
+error[E0277]: `i8` cannot be safely transmuted into `i16` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:65:40
+   |
+LL |     assert::is_transmutable::<   i8,   i16>();
+   |                                        ^^^ `i8` cannot be safely transmuted into `i16` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i16`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i8` cannot be safely transmuted into `u16` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:66:40
+   |
+LL |     assert::is_transmutable::<   i8,   u16>();
+   |                                        ^^^ `i8` cannot be safely transmuted into `u16` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u16`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i8` cannot be safely transmuted into `i32` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:67:40
+   |
+LL |     assert::is_transmutable::<   i8,   i32>();
+   |                                        ^^^ `i8` cannot be safely transmuted into `i32` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i32`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i8` cannot be safely transmuted into `f32` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:68:40
+   |
+LL |     assert::is_transmutable::<   i8,   f32>();
+   |                                        ^^^ `i8` cannot be safely transmuted into `f32` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f32`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i8` cannot be safely transmuted into `u32` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:69:40
+   |
+LL |     assert::is_transmutable::<   i8,   u32>();
+   |                                        ^^^ `i8` cannot be safely transmuted into `u32` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u32`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i8` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:70:40
+   |
+LL |     assert::is_transmutable::<   i8,   u64>();
+   |                                        ^^^ `i8` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i8` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:71:40
+   |
+LL |     assert::is_transmutable::<   i8,   i64>();
+   |                                        ^^^ `i8` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i8` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:72:40
+   |
+LL |     assert::is_transmutable::<   i8,   f64>();
+   |                                        ^^^ `i8` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i8` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:73:39
+   |
+LL |     assert::is_transmutable::<   i8,  u128>();
+   |                                       ^^^^ `i8` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i8` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:74:39
+   |
+LL |     assert::is_transmutable::<   i8,  i128>();
+   |                                       ^^^^ `i8` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u8` cannot be safely transmuted into `i16` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:76:40
+   |
+LL |     assert::is_transmutable::<   u8,   i16>();
+   |                                        ^^^ `u8` cannot be safely transmuted into `i16` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i16`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u8` cannot be safely transmuted into `u16` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:77:40
+   |
+LL |     assert::is_transmutable::<   u8,   u16>();
+   |                                        ^^^ `u8` cannot be safely transmuted into `u16` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u16`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u8` cannot be safely transmuted into `i32` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:78:40
+   |
+LL |     assert::is_transmutable::<   u8,   i32>();
+   |                                        ^^^ `u8` cannot be safely transmuted into `i32` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i32`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u8` cannot be safely transmuted into `f32` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:79:40
+   |
+LL |     assert::is_transmutable::<   u8,   f32>();
+   |                                        ^^^ `u8` cannot be safely transmuted into `f32` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f32`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u8` cannot be safely transmuted into `u32` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:80:40
+   |
+LL |     assert::is_transmutable::<   u8,   u32>();
+   |                                        ^^^ `u8` cannot be safely transmuted into `u32` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u32`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u8` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:81:40
+   |
+LL |     assert::is_transmutable::<   u8,   u64>();
+   |                                        ^^^ `u8` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u8` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:82:40
+   |
+LL |     assert::is_transmutable::<   u8,   i64>();
+   |                                        ^^^ `u8` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u8` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:83:40
+   |
+LL |     assert::is_transmutable::<   u8,   f64>();
+   |                                        ^^^ `u8` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u8` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:84:39
+   |
+LL |     assert::is_transmutable::<   u8,  u128>();
+   |                                       ^^^^ `u8` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u8` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:85:39
+   |
+LL |     assert::is_transmutable::<   u8,  i128>();
+   |                                       ^^^^ `u8` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u8, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i16` cannot be safely transmuted into `i32` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:87:40
+   |
+LL |     assert::is_transmutable::<  i16,   i32>();
+   |                                        ^^^ `i16` cannot be safely transmuted into `i32` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i32`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i16` cannot be safely transmuted into `f32` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:88:40
+   |
+LL |     assert::is_transmutable::<  i16,   f32>();
+   |                                        ^^^ `i16` cannot be safely transmuted into `f32` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f32`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i16` cannot be safely transmuted into `u32` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:89:40
+   |
+LL |     assert::is_transmutable::<  i16,   u32>();
+   |                                        ^^^ `i16` cannot be safely transmuted into `u32` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u32`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i16` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:90:40
+   |
+LL |     assert::is_transmutable::<  i16,   u64>();
+   |                                        ^^^ `i16` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i16` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:91:40
+   |
+LL |     assert::is_transmutable::<  i16,   i64>();
+   |                                        ^^^ `i16` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i16` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:92:40
+   |
+LL |     assert::is_transmutable::<  i16,   f64>();
+   |                                        ^^^ `i16` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i16` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:93:39
+   |
+LL |     assert::is_transmutable::<  i16,  u128>();
+   |                                       ^^^^ `i16` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i16` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:94:39
+   |
+LL |     assert::is_transmutable::<  i16,  i128>();
+   |                                       ^^^^ `i16` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u16` cannot be safely transmuted into `i32` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:96:40
+   |
+LL |     assert::is_transmutable::<  u16,   i32>();
+   |                                        ^^^ `u16` cannot be safely transmuted into `i32` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i32`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u16` cannot be safely transmuted into `f32` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:97:40
+   |
+LL |     assert::is_transmutable::<  u16,   f32>();
+   |                                        ^^^ `u16` cannot be safely transmuted into `f32` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f32`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u16` cannot be safely transmuted into `u32` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:98:40
+   |
+LL |     assert::is_transmutable::<  u16,   u32>();
+   |                                        ^^^ `u16` cannot be safely transmuted into `u32` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u32`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u16` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:99:40
+   |
+LL |     assert::is_transmutable::<  u16,   u64>();
+   |                                        ^^^ `u16` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u16` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:100:40
+   |
+LL |     assert::is_transmutable::<  u16,   i64>();
+   |                                        ^^^ `u16` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u16` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:101:40
+   |
+LL |     assert::is_transmutable::<  u16,   f64>();
+   |                                        ^^^ `u16` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u16` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:102:39
+   |
+LL |     assert::is_transmutable::<  u16,  u128>();
+   |                                       ^^^^ `u16` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u16` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:103:39
+   |
+LL |     assert::is_transmutable::<  u16,  i128>();
+   |                                       ^^^^ `u16` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u16, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i32` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:105:40
+   |
+LL |     assert::is_transmutable::<  i32,   u64>();
+   |                                        ^^^ `i32` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i32` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:106:40
+   |
+LL |     assert::is_transmutable::<  i32,   i64>();
+   |                                        ^^^ `i32` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i32` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:107:40
+   |
+LL |     assert::is_transmutable::<  i32,   f64>();
+   |                                        ^^^ `i32` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i32` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:108:39
+   |
+LL |     assert::is_transmutable::<  i32,  u128>();
+   |                                       ^^^^ `i32` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i32` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:109:39
+   |
+LL |     assert::is_transmutable::<  i32,  i128>();
+   |                                       ^^^^ `i32` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `f32` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:111:40
+   |
+LL |     assert::is_transmutable::<  f32,   u64>();
+   |                                        ^^^ `f32` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<f32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `f32` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:112:40
+   |
+LL |     assert::is_transmutable::<  f32,   i64>();
+   |                                        ^^^ `f32` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<f32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `f32` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:113:40
+   |
+LL |     assert::is_transmutable::<  f32,   f64>();
+   |                                        ^^^ `f32` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<f32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `f32` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:114:39
+   |
+LL |     assert::is_transmutable::<  f32,  u128>();
+   |                                       ^^^^ `f32` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<f32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `f32` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:115:39
+   |
+LL |     assert::is_transmutable::<  f32,  i128>();
+   |                                       ^^^^ `f32` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<f32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u32` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:117:40
+   |
+LL |     assert::is_transmutable::<  u32,   u64>();
+   |                                        ^^^ `u32` cannot be safely transmuted into `u64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u32` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:118:40
+   |
+LL |     assert::is_transmutable::<  u32,   i64>();
+   |                                        ^^^ `u32` cannot be safely transmuted into `i64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u32` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:119:40
+   |
+LL |     assert::is_transmutable::<  u32,   f64>();
+   |                                        ^^^ `u32` cannot be safely transmuted into `f64` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `f64`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u32` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:120:39
+   |
+LL |     assert::is_transmutable::<  u32,  u128>();
+   |                                       ^^^^ `u32` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u32` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:121:39
+   |
+LL |     assert::is_transmutable::<  u32,  i128>();
+   |                                       ^^^^ `u32` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u32, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u64` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:123:39
+   |
+LL |     assert::is_transmutable::<  u64,  u128>();
+   |                                       ^^^^ `u64` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u64, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `u64` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:124:39
+   |
+LL |     assert::is_transmutable::<  u64,  i128>();
+   |                                       ^^^^ `u64` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u64, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i64` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:126:39
+   |
+LL |     assert::is_transmutable::<  i64,  u128>();
+   |                                       ^^^^ `i64` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i64, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `i64` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:127:39
+   |
+LL |     assert::is_transmutable::<  i64,  i128>();
+   |                                       ^^^^ `i64` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<i64, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `f64` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:129:39
+   |
+LL |     assert::is_transmutable::<  f64,  u128>();
+   |                                       ^^^^ `f64` cannot be safely transmuted into `u128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<f64, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `u128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error[E0277]: `f64` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+  --> $DIR/numbers.rs:130:39
+   |
+LL |     assert::is_transmutable::<  f64,  i128>();
+   |                                       ^^^^ `f64` cannot be safely transmuted into `i128` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<f64, assert::Context, Assume { alignment: false, lifetimes: false, safety: false, validity: false }>` is not implemented for `i128`
+note: required by a bound in `is_transmutable`
+  --> $DIR/numbers.rs:15:14
+   |
+LL |     pub fn is_transmutable<Src, Dst>()
+   |            --------------- required by a bound in this function
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable`
+
+error: aborting due to 57 previous errors
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/transmutability/primitives/numbers.rs b/tests/ui/transmutability/primitives/numbers.rs
index 0df43d2045f..e980e91ed06 100644
--- a/tests/ui/transmutability/primitives/numbers.rs
+++ b/tests/ui/transmutability/primitives/numbers.rs
@@ -1,3 +1,6 @@
+// revisions: current next
+//[next] compile-flags: -Ztrait-solver=next
+
 #![crate_type = "lib"]
 #![feature(transmutability)]
 #![allow(dead_code)]
diff --git a/tests/ui/transmutability/primitives/unit.stderr b/tests/ui/transmutability/primitives/unit.current.stderr
index 988cd33b3bf..c20355e16f5 100644
--- a/tests/ui/transmutability/primitives/unit.stderr
+++ b/tests/ui/transmutability/primitives/unit.current.stderr
@@ -1,12 +1,12 @@
 error[E0277]: `()` cannot be safely transmuted into `u8` in the defining scope of `should_have_correct_size::Context`.
-  --> $DIR/unit.rs:28:35
+  --> $DIR/unit.rs:31:35
    |
 LL |     assert::is_transmutable::<(), u8, Context>();
    |                                   ^^ `()` cannot be safely transmuted into `u8` in the defining scope of `should_have_correct_size::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<(), should_have_correct_size::Context, Assume { alignment: true, lifetimes: true, safety: true, validity: true }>` is not implemented for `u8`
 note: required by a bound in `is_transmutable`
-  --> $DIR/unit.rs:12:14
+  --> $DIR/unit.rs:15:14
    |
 LL |       pub fn is_transmutable<Src, Dst, Context>()
    |              --------------- required by a bound in this function
diff --git a/tests/ui/transmutability/primitives/unit.next.stderr b/tests/ui/transmutability/primitives/unit.next.stderr
new file mode 100644
index 00000000000..c20355e16f5
--- /dev/null
+++ b/tests/ui/transmutability/primitives/unit.next.stderr
@@ -0,0 +1,25 @@
+error[E0277]: `()` cannot be safely transmuted into `u8` in the defining scope of `should_have_correct_size::Context`.
+  --> $DIR/unit.rs:31:35
+   |
+LL |     assert::is_transmutable::<(), u8, Context>();
+   |                                   ^^ `()` cannot be safely transmuted into `u8` in the defining scope of `should_have_correct_size::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<(), should_have_correct_size::Context, Assume { alignment: true, lifetimes: true, safety: true, validity: true }>` is not implemented for `u8`
+note: required by a bound in `is_transmutable`
+  --> $DIR/unit.rs:15:14
+   |
+LL |       pub fn is_transmutable<Src, Dst, Context>()
+   |              --------------- required by a bound in this function
+LL |       where
+LL |           Dst: BikeshedIntrinsicFrom<Src, Context, {
+   |  ______________^
+LL | |             Assume::ALIGNMENT
+LL | |                 .and(Assume::LIFETIMES)
+LL | |                 .and(Assume::SAFETY)
+LL | |                 .and(Assume::VALIDITY)
+LL | |         }>
+   | |__________^ required by this bound in `is_transmutable`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/transmutability/primitives/unit.rs b/tests/ui/transmutability/primitives/unit.rs
index 1975a61de98..12eac175106 100644
--- a/tests/ui/transmutability/primitives/unit.rs
+++ b/tests/ui/transmutability/primitives/unit.rs
@@ -1,3 +1,6 @@
+// revisions: current next
+//[next] compile-flags: -Ztrait-solver=next
+
 //! The unit type, `()`, should be one byte.
 
 #![crate_type = "lib"]
diff --git a/tests/ui/transmutability/references.stderr b/tests/ui/transmutability/references.current.stderr
index eb3bd03fd31..39d42cc4fa6 100644
--- a/tests/ui/transmutability/references.stderr
+++ b/tests/ui/transmutability/references.current.stderr
@@ -1,12 +1,12 @@
 error[E0277]: `&'static Unit` cannot be safely transmuted into `&'static Unit` in the defining scope of `assert::Context`.
-  --> $DIR/references.rs:26:52
+  --> $DIR/references.rs:29:52
    |
 LL |     assert::is_maybe_transmutable::<&'static Unit, &'static Unit>();
    |                                                    ^^^^^^^^^^^^^ `&'static Unit` cannot be safely transmuted into `&'static Unit` in the defining scope of `assert::Context`.
    |
    = help: the trait `BikeshedIntrinsicFrom<&'static Unit, assert::Context, Assume { alignment: true, lifetimes: true, safety: true, validity: true }>` is not implemented for `&'static Unit`
 note: required by a bound in `is_maybe_transmutable`
-  --> $DIR/references.rs:13:14
+  --> $DIR/references.rs:16:14
    |
 LL |       pub fn is_maybe_transmutable<Src, Dst>()
    |              --------------------- required by a bound in this function
diff --git a/tests/ui/transmutability/references.next.stderr b/tests/ui/transmutability/references.next.stderr
new file mode 100644
index 00000000000..39d42cc4fa6
--- /dev/null
+++ b/tests/ui/transmutability/references.next.stderr
@@ -0,0 +1,26 @@
+error[E0277]: `&'static Unit` cannot be safely transmuted into `&'static Unit` in the defining scope of `assert::Context`.
+  --> $DIR/references.rs:29:52
+   |
+LL |     assert::is_maybe_transmutable::<&'static Unit, &'static Unit>();
+   |                                                    ^^^^^^^^^^^^^ `&'static Unit` cannot be safely transmuted into `&'static Unit` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<&'static Unit, assert::Context, Assume { alignment: true, lifetimes: true, safety: true, validity: true }>` is not implemented for `&'static Unit`
+note: required by a bound in `is_maybe_transmutable`
+  --> $DIR/references.rs:16:14
+   |
+LL |       pub fn is_maybe_transmutable<Src, Dst>()
+   |              --------------------- required by a bound in this function
+LL |       where
+LL |           Dst: BikeshedIntrinsicFrom<Src, Context, {
+   |  ______________^
+LL | |             Assume {
+LL | |                 alignment: true,
+LL | |                 lifetimes: true,
+...  |
+LL | |             }
+LL | |         }>
+   | |__________^ required by this bound in `is_maybe_transmutable`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/transmutability/references.rs b/tests/ui/transmutability/references.rs
index af3ff0ec1d2..8c2b25ebba1 100644
--- a/tests/ui/transmutability/references.rs
+++ b/tests/ui/transmutability/references.rs
@@ -1,3 +1,6 @@
+// revisions: current next
+//[next] compile-flags: -Ztrait-solver=next
+
 //! Transmutations involving references are not yet supported.
 
 #![crate_type = "lib"]