Auto merge of #49368 - matthewjasper:feature-gate-where-clause, r=nikomatsakis

Feature gate where clauses on associated types

Fixes #49365. Requires crater: these have been usable since 1.24.

2 files changed, 26 insertions, 3 deletions

diff --git a/src/test/ui/feature-gate-generic_associated_types.rs b/src/test/ui/feature-gate-generic_associated_types.rs
index 724ec2496f2..34706626866 100644
--- a/src/test/ui/feature-gate-generic_associated_types.rs
+++ b/src/test/ui/feature-gate-generic_associated_types.rs
@@ -15,6 +15,7 @@ trait PointerFamily<U> {
     //~^ ERROR generic associated types are unstable
     type Pointer2<T>: Deref<Target = T> where T: Clone, U: Clone;
     //~^ ERROR generic associated types are unstable
+    //~| ERROR where clauses on associated types are unstable
 }
 
 struct Foo;
@@ -25,4 +26,10 @@ impl PointerFamily<u32> for Foo {
     //~^ ERROR generic associated types are unstable
 }
 
+trait Bar {
+    type Assoc where Self: Sized;
+    //~^ ERROR where clauses on associated types are unstable
+}
+
+
 fn main() {}
diff --git a/src/test/ui/feature-gate-generic_associated_types.stderr b/src/test/ui/feature-gate-generic_associated_types.stderr
index 5f23def88eb..d7891f13c6b 100644
--- a/src/test/ui/feature-gate-generic_associated_types.stderr
+++ b/src/test/ui/feature-gate-generic_associated_types.stderr
@@ -14,8 +14,16 @@ LL |     type Pointer2<T>: Deref<Target = T> where T: Clone, U: Clone;
    |
    = help: add #![feature(generic_associated_types)] to the crate attributes to enable
 
+error[E0658]: where clauses on associated types are unstable (see issue #44265)
+  --> $DIR/feature-gate-generic_associated_types.rs:16:5
+   |
+LL |     type Pointer2<T>: Deref<Target = T> where T: Clone, U: Clone;
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(generic_associated_types)] to the crate attributes to enable
+
 error[E0658]: generic associated types are unstable (see issue #44265)
-  --> $DIR/feature-gate-generic_associated_types.rs:22:5
+  --> $DIR/feature-gate-generic_associated_types.rs:23:5
    |
 LL |     type Pointer<usize> = Box<usize>;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -23,13 +31,21 @@ LL |     type Pointer<usize> = Box<usize>;
    = help: add #![feature(generic_associated_types)] to the crate attributes to enable
 
 error[E0658]: generic associated types are unstable (see issue #44265)
-  --> $DIR/feature-gate-generic_associated_types.rs:24:5
+  --> $DIR/feature-gate-generic_associated_types.rs:25:5
    |
 LL |     type Pointer2<u32> = Box<u32>;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add #![feature(generic_associated_types)] to the crate attributes to enable
 
-error: aborting due to 4 previous errors
+error[E0658]: where clauses on associated types are unstable (see issue #44265)
+  --> $DIR/feature-gate-generic_associated_types.rs:30:5
+   |
+LL |     type Assoc where Self: Sized;
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(generic_associated_types)] to the crate attributes to enable
+
+error: aborting due to 6 previous errors
 
 For more information about this error, try `rustc --explain E0658`.