From 992ba801c271aeb087b1619467c487e35bae4e65 Mon Sep 17 00:00:00 2001
From: Michael Goulet <michael@errs.io>
Date: Wed, 28 Dec 2022 06:44:29 +0000
Subject: [PATCH] Add test for bad suggestion

---
 .../mismatched-where-clause-regions.rs          | 12 ++++++++++++
 .../mismatched-where-clause-regions.stderr      | 17 +++++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 src/test/ui/generic-associated-types/mismatched-where-clause-regions.rs
 create mode 100644 src/test/ui/generic-associated-types/mismatched-where-clause-regions.stderr

diff --git a/src/test/ui/generic-associated-types/mismatched-where-clause-regions.rs b/src/test/ui/generic-associated-types/mismatched-where-clause-regions.rs
new file mode 100644
index 000000000000..8caf5317693e
--- /dev/null
+++ b/src/test/ui/generic-associated-types/mismatched-where-clause-regions.rs
@@ -0,0 +1,12 @@
+trait Foo {
+    type T<'a1, 'b1>
+    where
+        'a1: 'b1;
+}
+
+impl Foo for () {
+    type T<'a2, 'b2> = () where 'b2: 'a2;
+    //~^ ERROR impl has stricter requirements than trait
+}
+
+fn main() {}
diff --git a/src/test/ui/generic-associated-types/mismatched-where-clause-regions.stderr b/src/test/ui/generic-associated-types/mismatched-where-clause-regions.stderr
new file mode 100644
index 000000000000..91a030076408
--- /dev/null
+++ b/src/test/ui/generic-associated-types/mismatched-where-clause-regions.stderr
@@ -0,0 +1,17 @@
+error[E0276]: impl has stricter requirements than trait
+  --> $DIR/mismatched-where-clause-regions.rs:8:38
+   |
+LL |     type T<'a1, 'b1>
+   |     ---------------- definition of `T` from trait
+...
+LL |     type T<'a2, 'b2> = () where 'b2: 'a2;
+   |                                      ^^^ impl has extra requirement `'b2: 'a2`
+   |
+help: copy the `where` clause predicates from the trait
+   |
+LL |     type T<'a2, 'b2> = () where 'a2: 'b2;
+   |                           ~~~~~~~~~~~~~~
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0276`.