1 files changed, 28 insertions, 0 deletions
diff --git a/src/test/ui/unboxed-closures/unboxed-closure-sugar-default.rs b/src/test/ui/unboxed-closures/unboxed-closure-sugar-default.rs
new file mode 100644
index 000000000..f1c83f060
--- /dev/null
+++ b/src/test/ui/unboxed-closures/unboxed-closure-sugar-default.rs
@@ -0,0 +1,28 @@
+// Test interaction between unboxed closure sugar and default type
+// parameters (should be exactly as if angle brackets were used).
+
+#![feature(unboxed_closures)]
+#![allow(dead_code)]
+
+trait Foo<T,V=T> {
+    type Output;
+    fn dummy(&self, t: T, v: V);
+}
+
+trait Eq<X: ?Sized> { fn same_types(&self, x: &X) -> bool { true } }
+impl<X: ?Sized> Eq<X> for X { }
+fn eq<A: ?Sized,B: ?Sized>() where A : Eq<B> { }
+
+fn test<'a,'b>() {
+    // Parens are equivalent to omitting default in angle.
+    eq::<dyn Foo<(isize,), Output=()>, dyn Foo(isize)>();
+
+    // In angle version, we supply something other than the default
+    eq::<dyn Foo<(isize,), isize, Output=()>, dyn Foo(isize)>();
+    //~^ ERROR E0277
+
+    // Supply default explicitly.
+    eq::<dyn Foo<(isize,), (isize,), Output=()>, dyn Foo(isize)>();
+}
+
+fn main() { }