1 files changed, 48 insertions, 0 deletions
diff --git a/tests/ui/unboxed-closures/unboxed-closure-sugar-equiv.rs b/tests/ui/unboxed-closures/unboxed-closure-sugar-equiv.rs
new file mode 100644
index 000000000..acf0227a7
--- /dev/null
+++ b/tests/ui/unboxed-closures/unboxed-closure-sugar-equiv.rs
@@ -0,0 +1,48 @@
+// Test that the unboxed closure sugar can be used with an arbitrary
+// struct type and that it is equivalent to the same syntax using
+// angle brackets. This test covers only simple types and in
+// particular doesn't test bound regions.
+
+#![feature(unboxed_closures)]
+#![allow(dead_code)]
+
+trait Foo<T> {
+    type Output;
+    fn dummy(&self, t: T, u: Self::Output);
+}
+
+trait Eq<X: ?Sized> { }
+impl<X: ?Sized> Eq<X> for X { }
+fn eq<A: ?Sized,B: ?Sized +Eq<A>>() { }
+
+fn test<'a,'b>() {
+    // No errors expected:
+    eq::< dyn Foo<(),Output=()>,                       dyn Foo()                         >();
+    eq::< dyn Foo<(isize,),Output=()>,                 dyn Foo(isize)                      >();
+    eq::< dyn Foo<(isize,usize),Output=()>,            dyn Foo(isize,usize)                 >();
+    eq::< dyn Foo<(isize,usize),Output=usize>,         dyn Foo(isize,usize) -> usize         >();
+    eq::< dyn Foo<(&'a isize,&'b usize),Output=usize>, dyn Foo(&'a isize,&'b usize) -> usize >();
+
+    // Test that anonymous regions in `()` form are equivalent
+    // to fresh bound regions, and that we can intermingle
+    // named and anonymous as we choose:
+    eq::< dyn for<'x,'y> Foo<(&'x isize,&'y usize),Output=usize>,
+          dyn for<'x,'y> Foo(&'x isize,&'y usize) -> usize            >();
+    eq::< dyn for<'x,'y> Foo<(&'x isize,&'y usize),Output=usize>,
+          dyn for<'x> Foo(&'x isize,&usize) -> usize                  >();
+    eq::< dyn for<'x,'y> Foo<(&'x isize,&'y usize),Output=usize>,
+          dyn for<'y> Foo(&isize,&'y usize) -> usize                  >();
+    eq::< dyn for<'x,'y> Foo<(&'x isize,&'y usize),Output=usize>,
+          dyn Foo(&isize,&usize) -> usize                             >();
+
+    // lifetime elision
+    eq::< dyn for<'x> Foo<(&'x isize,), Output=&'x isize>,
+          dyn Foo(&isize) -> &isize                                   >();
+
+    // Errors expected:
+    eq::< dyn Foo<(),Output=()>,
+          dyn Foo(char)                                               >();
+    //~^ ERROR E0277
+}
+
+fn main() { }