1 files changed, 43 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/equality.rs b/tests/ui/impl-trait/equality.rs
new file mode 100644
index 00000000000..828b5aac896
--- /dev/null
+++ b/tests/ui/impl-trait/equality.rs
@@ -0,0 +1,43 @@
+#![feature(specialization)] //~ WARN the feature `specialization` is incomplete
+
+trait Foo: Copy + ToString {}
+
+impl<T: Copy + ToString> Foo for T {}
+
+fn hide<T: Foo>(x: T) -> impl Foo {
+    x
+}
+
+fn two(x: bool) -> impl Foo {
+    if x {
+        return 1_i32;
+    }
+    0_u32
+    //~^ ERROR mismatched types
+    //~| expected `i32`, found `u32`
+}
+
+fn sum_to(n: u32) -> impl Foo {
+    if n == 0 {
+        0
+    } else {
+        n + sum_to(n - 1)
+        //~^ ERROR cannot add `impl Foo` to `u32`
+    }
+}
+
+trait Leak: Sized {
+    type T;
+    fn leak(self) -> Self::T;
+}
+impl<T> Leak for T {
+    default type T = ();
+    default fn leak(self) -> Self::T { panic!() }
+}
+impl Leak for i32 {
+    type T = i32;
+    fn leak(self) -> i32 { self }
+}
+
+fn main() {
+}