coherence doesn't like region constraints

Author: compiler-errors

tests/ui/coherence/coherence-negative-outlives-lifetimes.rs

@@ -1,5 +1,5 @@
 // revisions: stock with_negative_coherence
-//[with_negative_coherence] check-pass
+//[with_negative_coherence] known-bug: unknown
 
 #![feature(negative_impls)]
 #![cfg_attr(with_negative_coherence, feature(with_negative_coherence))]

tests/ui/coherence/coherence-negative-outlives-lifetimes.with_negative_coherence.stderr

@@ -0,0 +1,11 @@
+error[E0119]: conflicting implementations of trait `MyTrait<'_>` for type `&_`
+  --> $DIR/coherence-negative-outlives-lifetimes.rs:14:1
+   |
+LL | impl<'a, T: MyPredicate<'a>> MyTrait<'a> for T {}
+   | ---------------------------------------------- first implementation here
+LL | impl<'a, T> MyTrait<'a> for &'a T {}
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `&_`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0119`.

tests/ui/coherence/coherence-overlap-with-regions.rs

@@ -1,4 +1,4 @@
-// check-pass
+// known-bug: unknown
 
 #![feature(negative_impls)]
 #![feature(rustc_attrs)]

tests/ui/coherence/coherence-overlap-with-regions.stderr

@@ -0,0 +1,11 @@
+error[E0119]: conflicting implementations of trait `Bar` for type `&_`
+  --> $DIR/coherence-overlap-with-regions.rs:20:1
+   |
+LL | impl<T: Foo> Bar for T {}
+   | ---------------------- first implementation here
+LL | impl<T> Bar for &T where T: 'static {}
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `&_`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0119`.

tests/ui/coherence/negative-coherence-considering-regions.rs

@@ -1,5 +1,5 @@
 // revisions: any_lt static_lt
-//[static_lt] check-pass
+//[static_lt] known-bug: unknown
 
 #![feature(negative_impls)]
 #![feature(with_negative_coherence)]

tests/ui/coherence/negative-coherence-considering-regions.static_lt.stderr

@@ -0,0 +1,12 @@
+error[E0119]: conflicting implementations of trait `Bar` for type `&'static _`
+  --> $DIR/negative-coherence-considering-regions.rs:26:1
+   |
+LL | impl<T> Bar for T where T: Foo {}
+   | ------------------------------ first implementation here
+...
+LL | impl<T> Bar for &'static T {}
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `&'static _`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0119`.