1 files changed, 45 insertions, 0 deletions
diff --git a/tests/ui/dep-graph/dep-graph-trait-impl-two-traits.rs b/tests/ui/dep-graph/dep-graph-trait-impl-two-traits.rs
new file mode 100644
index 00000000000..590475fa03a
--- /dev/null
+++ b/tests/ui/dep-graph/dep-graph-trait-impl-two-traits.rs
@@ -0,0 +1,45 @@
+// Test that adding an impl to a trait `Foo` does not affect functions
+// that only use `Bar`, so long as they do not have methods in common.
+
+// incremental
+// compile-flags: -Z query-dep-graph
+
+#![feature(rustc_attrs)]
+#![allow(warnings)]
+
+fn main() { }
+
+pub trait Foo: Sized {
+    fn foo(self) { }
+}
+
+pub trait Bar: Sized {
+    fn bar(self) { }
+}
+
+mod x {
+    use {Foo, Bar};
+
+    #[rustc_if_this_changed]
+    impl Foo for char { }
+
+    impl Bar for char { }
+}
+
+mod y {
+    use {Foo, Bar};
+
+    #[rustc_then_this_would_need(typeck)] //~ ERROR OK
+    pub fn call_bar() {
+        char::bar('a');
+    }
+}
+
+mod z {
+    use y;
+
+    #[rustc_then_this_would_need(typeck)] //~ ERROR no path
+    pub fn z() {
+        y::call_bar();
+    }
+}