From ff11dfd71d900a05033f3c1b126a792e02a032fb Mon Sep 17 00:00:00 2001
From: Santiago Pastorino <spastorino@gmail.com>
Date: Thu, 10 Feb 2022 11:55:23 -0300
Subject: [PATCH] Add failing test that should pass

---
 .../coherence-negative-outlives-lifetimes.rs         | 12 ++++++++++++
 .../coherence-negative-outlives-lifetimes.stderr     | 11 +++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 src/test/ui/coherence/coherence-negative-outlives-lifetimes.rs
 create mode 100644 src/test/ui/coherence/coherence-negative-outlives-lifetimes.stderr

diff --git a/src/test/ui/coherence/coherence-negative-outlives-lifetimes.rs b/src/test/ui/coherence/coherence-negative-outlives-lifetimes.rs
new file mode 100644
index 0000000000000..159788b1b77f7
--- /dev/null
+++ b/src/test/ui/coherence/coherence-negative-outlives-lifetimes.rs
@@ -0,0 +1,12 @@
+#![feature(negative_impls)]
+
+// FIXME: this should compile
+
+trait MyPredicate<'a> {}
+impl<'a, T> !MyPredicate<'a> for &T where T: 'a {}
+trait MyTrait<'a> {}
+impl<'a, T: MyPredicate<'a>> MyTrait<'a> for T {}
+impl<'a, T> MyTrait<'a> for &'a T {}
+//~^ ERROR: conflicting implementations of trait `MyTrait<'_>` for type `&_`
+
+fn main() {}
diff --git a/src/test/ui/coherence/coherence-negative-outlives-lifetimes.stderr b/src/test/ui/coherence/coherence-negative-outlives-lifetimes.stderr
new file mode 100644
index 0000000000000..263bd19b4249e
--- /dev/null
+++ b/src/test/ui/coherence/coherence-negative-outlives-lifetimes.stderr
@@ -0,0 +1,11 @@
+error[E0119]: conflicting implementations of trait `MyTrait<'_>` for type `&_`
+  --> $DIR/coherence-negative-outlives-lifetimes.rs:9:1
+   |
+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`.