1 files changed, 45 insertions, 0 deletions
diff --git a/src/test/ui/traits/where-clause-vs-impl.rs b/src/test/ui/traits/where-clause-vs-impl.rs
new file mode 100644
index 000000000..7cfee27ef
--- /dev/null
+++ b/src/test/ui/traits/where-clause-vs-impl.rs
@@ -0,0 +1,45 @@
+// run-pass
+#![allow(dead_code)]
+#![allow(unused_variables)]
+// Test that when there is a conditional (but blanket) impl and a
+// where clause, we don't get confused in trait resolution.
+//
+// Issue #18453.
+
+// pretty-expanded FIXME #23616
+
+use std::rc::Rc;
+
+pub trait Foo<M> {
+    fn foo(&mut self, msg: M);
+}
+
+pub trait Bar<M> {
+    fn dummy(&self) -> M;
+}
+
+impl<M, F: Bar<M>> Foo<M> for F {
+    fn foo(&mut self, msg: M) {
+    }
+}
+
+pub struct Both<M, F> {
+    inner: Rc<(M, F)>,
+}
+
+impl<M, F: Foo<M>> Clone for Both<M, F> {
+    fn clone(&self) -> Both<M, F> {
+        Both { inner: self.inner.clone() }
+    }
+}
+
+fn repro1<M, F: Foo<M>>(_both: Both<M, F>) {
+}
+
+fn repro2<M, F: Foo<M>>(msg: M, foo: F) {
+    let both = Both { inner: Rc::new((msg, foo)) };
+    repro1(both.clone()); // <--- This clone causes problem
+}
+
+pub fn main() {
+}