1 files changed, 38 insertions, 0 deletions
diff --git a/src/test/ui/dep-graph/dep-graph-assoc-type-codegen.rs b/src/test/ui/dep-graph/dep-graph-assoc-type-codegen.rs
new file mode 100644
index 000000000..978c19948
--- /dev/null
+++ b/src/test/ui/dep-graph/dep-graph-assoc-type-codegen.rs
@@ -0,0 +1,38 @@
+// Test that when a trait impl changes, fns whose body uses that trait
+// must also be recompiled.
+
+// incremental
+// compile-flags: -Z query-dep-graph
+
+#![feature(rustc_attrs)]
+#![allow(warnings)]
+
+fn main() { }
+
+pub trait Foo: Sized {
+    type T;
+    fn method(self) { }
+}
+
+mod x {
+    use Foo;
+
+    #[rustc_if_this_changed]
+    impl Foo for char { type T = char; }
+
+    impl Foo for u32 { type T = u32; }
+}
+
+mod y {
+    use Foo;
+
+    #[rustc_then_this_would_need(typeck)] //~ ERROR OK
+    pub fn use_char_assoc() {
+        // Careful here: in the representation, <char as Foo>::T gets
+        // normalized away, so at a certain point we had no edge to
+        // codegen.  (But now codegen just depends on typeck.)
+        let x: <char as Foo>::T = 'a';
+    }
+
+    pub fn take_foo<T:Foo>(t: T) { }
+}