1 files changed, 21 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-37291/main.rs b/src/test/ui/issues/issue-37291/main.rs
new file mode 100644
index 000000000..6fb6b50da
--- /dev/null
+++ b/src/test/ui/issues/issue-37291/main.rs
@@ -0,0 +1,21 @@
+// run-pass
+#![allow(unused_imports)]
+// aux-build:lib.rs
+
+// Regression test for #37291. The problem was that the starting
+// environment for a specialization check was not including the
+// where-clauses from the impl when attempting to normalize the impl's
+// trait-ref, so things like `<C as Foo>::Item` could not resolve,
+// since the `C: Foo` trait bound was not included in the environment.
+
+extern crate lib;
+
+use lib::{CV, WrapperB, WrapperC};
+
+fn main() {
+    let a = WrapperC(CV);
+    let b = WrapperC(CV);
+    if false {
+        let _ = a * b;
+    }
+}