1 files changed, 42 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-37291/auxiliary/lib.rs b/tests/ui/issues/issue-37291/auxiliary/lib.rs
new file mode 100644
index 000000000..1b163ee13
--- /dev/null
+++ b/tests/ui/issues/issue-37291/auxiliary/lib.rs
@@ -0,0 +1,42 @@
+#![crate_type = "lib"]
+
+use std::ops::Mul;
+
+pub trait A {}
+pub trait B {
+    type AT: A;
+}
+pub trait C {
+    type BT: B;
+}
+
+pub struct AV;
+impl A for AV {}
+
+pub struct BV;
+impl B for BV {
+    type AT = AV;
+}
+
+pub struct CV;
+impl C for CV {
+    type BT = BV;
+}
+
+pub struct WrapperB<T>(pub T);
+pub struct WrapperC<T>(pub T);
+
+impl<C1> Mul<WrapperB<<C1::BT as B>::AT>> for WrapperC<C1>
+    where C1: C
+{
+    type Output = u8;
+    fn mul(self, _: WrapperB<<C1::BT as B>::AT>) -> Self::Output {
+        loop {}
+    }
+}
+impl<C1> Mul<WrapperC<C1>> for WrapperC<C1> {
+    type Output = u8;
+    fn mul(self, _: WrapperC<C1>) -> Self::Output {
+        loop {}
+    }
+}