1 files changed, 57 insertions, 0 deletions
diff --git a/src/test/ui/nll/user-annotations/dump-fn-method.rs b/src/test/ui/nll/user-annotations/dump-fn-method.rs
new file mode 100644
index 000000000..148d63d84
--- /dev/null
+++ b/src/test/ui/nll/user-annotations/dump-fn-method.rs
@@ -0,0 +1,57 @@
+// Unit test for the "user substitutions" that are annotated on each
+// node.
+
+// compile-flags:-Zverbose
+
+#![feature(rustc_attrs)]
+
+// Note: we reference the names T and U in the comments below.
+trait Bazoom<T> {
+    fn method<U>(&self, arg: T, arg2: U) { }
+}
+
+impl<S, T> Bazoom<T> for S {
+}
+
+fn foo<'a, T>(_: T) { }
+
+#[rustc_dump_user_substs]
+fn main() {
+    // Here: nothing is given, so we don't have any annotation.
+    let x = foo;
+    x(22);
+
+    // Here: `u32` is given, which doesn't contain any lifetimes, so we don't
+    // have any annotation.
+    let x = foo::<u32>;
+    x(22);
+
+    let x = foo::<&'static u32>; //~ ERROR [&ReStatic u32]
+    x(&22);
+
+    // Here: we only want the `T` to be given, the rest should be variables.
+    //
+    // (`T` refers to the declaration of `Bazoom`)
+    let x = <_ as Bazoom<u32>>::method::<_>; //~ ERROR [^0, u32, ^1]
+    x(&22, 44, 66);
+
+    // Here: all are given and definitely contain no lifetimes, so we
+    // don't have any annotation.
+    let x = <u8 as Bazoom<u16>>::method::<u32>;
+    x(&22, 44, 66);
+
+    // Here: all are given and we have a lifetime.
+    let x = <u8 as Bazoom<&'static u16>>::method::<u32>; //~ ERROR [u8, &ReStatic u16, u32]
+    x(&22, &44, 66);
+
+    // Here: we want in particular that *only* the method `U`
+    // annotation is given, the rest are variables.
+    //
+    // (`U` refers to the declaration of `Bazoom`)
+    let y = 22_u32;
+    y.method::<u32>(44, 66); //~ ERROR [^0, ^1, u32]
+
+    // Here: nothing is given, so we don't have any annotation.
+    let y = 22_u32;
+    y.method(44, 66);
+}