1 files changed, 31 insertions, 0 deletions
diff --git a/src/test/ui/regions/regions-normalize-in-where-clause-list.rs b/src/test/ui/regions/regions-normalize-in-where-clause-list.rs
new file mode 100644
index 000000000..389f82e79
--- /dev/null
+++ b/src/test/ui/regions/regions-normalize-in-where-clause-list.rs
@@ -0,0 +1,31 @@
+// Test that we are able to normalize in the list of where-clauses,
+// even if `'a: 'b` is required.
+
+trait Project<'a, 'b> {
+    type Item;
+}
+
+impl<'a, 'b> Project<'a, 'b> for ()
+where
+    'a: 'b,
+{
+    type Item = ();
+}
+
+// No error here, we have 'a: 'b. We used to report an error here
+// though, see https://github.com/rust-lang/rust/issues/45937.
+fn foo<'a: 'b, 'b>()
+where
+    <() as Project<'a, 'b>>::Item: Eq,
+{
+}
+
+// Here we get an error: we need `'a: 'b`.
+fn bar<'a, 'b>()
+//~^ ERROR cannot infer
+where
+    <() as Project<'a, 'b>>::Item: Eq,
+{
+}
+
+fn main() {}