add test for ICE

`asked to assemble constituent types of unexpected type: Binder(Foo, [])`

Fixes rust-lang#10972

Author: matthiaskrgr

tests/ui/crashes/ice-10972-tait.rs

@@ -0,0 +1,9 @@
+// ICE: #10972
+// asked to assemble constituent types of unexpected type: Binder(Foo, [])
+#![feature(type_alias_impl_trait)]
+
+use std::fmt::Debug;
+type Foo = impl Debug;
+const FOO2: Foo = 22_u32;
+
+pub fn main() {}