3 files changed, 108 insertions, 0 deletions
diff --git a/src/test/ui/numeric/numeric-cast-no-fix.rs b/src/test/ui/numeric/numeric-cast-no-fix.rs
new file mode 100644
index 00000000000..8bfd8333541
--- /dev/null
+++ b/src/test/ui/numeric/numeric-cast-no-fix.rs
@@ -0,0 +1,22 @@
+#[allow(unused_must_use)]
+fn main() {
+    let x_usize: usize = 1;
+    let x_u128: u128 = 2;
+    let x_u64: u64 = 3;
+    let x_u32: u32 = 4;
+    let x_u16: u16 = 5;
+    let x_u8: u8 = 6;
+
+    x_usize > -1_isize;
+    //~^ ERROR mismatched types
+    x_u128 > -1_isize;
+    //~^ ERROR mismatched types
+    x_u64 > -1_isize;
+    //~^ ERROR mismatched types
+    x_u32 > -1_isize;
+    //~^ ERROR mismatched types
+    x_u16 > -1_isize;
+    //~^ ERROR mismatched types
+    x_u8 > -1_isize;
+    //~^ ERROR mismatched types
+}
diff --git a/src/test/ui/numeric/numeric-cast-no-fix.stderr b/src/test/ui/numeric/numeric-cast-no-fix.stderr
new file mode 100644
index 00000000000..51e263d636f
--- /dev/null
+++ b/src/test/ui/numeric/numeric-cast-no-fix.stderr
@@ -0,0 +1,74 @@
+error[E0308]: mismatched types
+  --> $DIR/numeric-cast-no-fix.rs:10:15
+   |
+LL |     x_usize > -1_isize;
+   |               ^^^^^^^^ expected `usize`, found `isize`
+   |
+note: `-1_isize` can never fit into `usize`
+  --> $DIR/numeric-cast-no-fix.rs:10:15
+   |
+LL |     x_usize > -1_isize;
+   |               ^^^^^^^^
+
+error[E0308]: mismatched types
+  --> $DIR/numeric-cast-no-fix.rs:12:14
+   |
+LL |     x_u128 > -1_isize;
+   |              ^^^^^^^^ expected `u128`, found `isize`
+   |
+note: `-1_isize` can never fit into `u128`
+  --> $DIR/numeric-cast-no-fix.rs:12:14
+   |
+LL |     x_u128 > -1_isize;
+   |              ^^^^^^^^
+
+error[E0308]: mismatched types
+  --> $DIR/numeric-cast-no-fix.rs:14:13
+   |
+LL |     x_u64 > -1_isize;
+   |             ^^^^^^^^ expected `u64`, found `isize`
+   |
+note: `-1_isize` can never fit into `u64`
+  --> $DIR/numeric-cast-no-fix.rs:14:13
+   |
+LL |     x_u64 > -1_isize;
+   |             ^^^^^^^^
+
+error[E0308]: mismatched types
+  --> $DIR/numeric-cast-no-fix.rs:16:13
+   |
+LL |     x_u32 > -1_isize;
+   |             ^^^^^^^^ expected `u32`, found `isize`
+   |
+note: `-1_isize` can never fit into `u32`
+  --> $DIR/numeric-cast-no-fix.rs:16:13
+   |
+LL |     x_u32 > -1_isize;
+   |             ^^^^^^^^
+
+error[E0308]: mismatched types
+  --> $DIR/numeric-cast-no-fix.rs:18:13
+   |
+LL |     x_u16 > -1_isize;
+   |             ^^^^^^^^ expected `u16`, found `isize`
+   |
+note: `-1_isize` can never fit into `u16`
+  --> $DIR/numeric-cast-no-fix.rs:18:13
+   |
+LL |     x_u16 > -1_isize;
+   |             ^^^^^^^^
+
+error[E0308]: mismatched types
+  --> $DIR/numeric-cast-no-fix.rs:20:12
+   |
+LL |     x_u8 > -1_isize;
+   |            ^^^^^^^^ expected `u8`, found `isize`
+   |
+help: you can convert `x_u8` from `u8` to `isize`, matching the type of `-1_isize`
+   |
+LL |     isize::from(x_u8) > -1_isize;
+   |     ^^^^^^^^^^^^^^^^^
+
+error: aborting due to 6 previous errors
+
+For more information about this error, try `rustc --explain E0308`.
diff --git a/src/test/ui/repeat_count.stderr b/src/test/ui/repeat_count.stderr
index 6a081e23d9d..a1d5b36931d 100644
--- a/src/test/ui/repeat_count.stderr
+++ b/src/test/ui/repeat_count.stderr
@@ -39,12 +39,24 @@ error[E0308]: mismatched types
    |
 LL |     let f = [0; -4_isize];
    |                 ^^^^^^^^ expected `usize`, found `isize`
+   |
+note: `-4_isize` can never fit into `usize`
+  --> $DIR/repeat_count.rs:19:17
+   |
+LL |     let f = [0; -4_isize];
+   |                 ^^^^^^^^
 
 error[E0308]: mismatched types
   --> $DIR/repeat_count.rs:22:23
    |
 LL |     let f = [0_usize; -1_isize];
    |                       ^^^^^^^^ expected `usize`, found `isize`
+   |
+note: `-1_isize` can never fit into `usize`
+  --> $DIR/repeat_count.rs:22:23
+   |
+LL |     let f = [0_usize; -1_isize];
+   |                       ^^^^^^^^
 
 error[E0308]: mismatched types
   --> $DIR/repeat_count.rs:25:17