Add UI tests for diagnostics comparing types

They highlight how types are displayed in those cases, and will show
how the current output is altered by the next patch.

Author: glandium

src/test/ui/type-mismatch.rs

@@ -0,0 +1,86 @@
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+trait Qux {}
+struct A;
+struct B;
+impl Qux for A {}
+impl Qux for B {}
+
+struct Foo<T, U: Qux = A, V: Qux = B>(T, U, V);
+
+struct foo;
+struct bar;
+
+fn want<T>(t: T) {}
+
+fn have_usize(f: usize) {
+    want::<foo>(f); //~ ERROR mismatched types
+    want::<bar>(f); //~ ERROR mismatched types
+    want::<Foo<usize>>(f); //~ ERROR mismatched types
+    want::<Foo<usize, B>>(f); //~ ERROR mismatched types
+    want::<Foo<foo>>(f); //~ ERROR mismatched types
+    want::<Foo<foo, B>>(f); //~ ERROR mismatched types
+    want::<Foo<bar>>(f); //~ ERROR mismatched types
+    want::<Foo<bar, B>>(f); //~ ERROR mismatched types
+}
+
+fn have_foo(f: foo) {
+    want::<usize>(f); //~ ERROR mismatched types
+    want::<bar>(f); //~ ERROR mismatched types
+    want::<Foo<usize>>(f); //~ ERROR mismatched types
+    want::<Foo<usize, B>>(f); //~ ERROR mismatched types
+    want::<Foo<foo>>(f); //~ ERROR mismatched types
+    want::<Foo<foo, B>>(f); //~ ERROR mismatched types
+    want::<Foo<bar>>(f); //~ ERROR mismatched types
+    want::<Foo<bar, B>>(f); //~ ERROR mismatched types
+}
+
+fn have_foo_foo(f: Foo<foo>) {
+    want::<usize>(f); //~ ERROR mismatched types
+    want::<foo>(f); //~ ERROR mismatched types
+    want::<bar>(f); //~ ERROR mismatched types
+    want::<Foo<usize>>(f); //~ ERROR mismatched types
+    want::<Foo<usize, B>>(f); //~ ERROR mismatched types
+    want::<Foo<foo, B>>(f); //~ ERROR mismatched types
+    want::<Foo<bar>>(f); //~ ERROR mismatched types
+    want::<Foo<bar, B>>(f); //~ ERROR mismatched types
+    want::<&Foo<foo>>(f); //~ ERROR mismatched types
+    want::<&Foo<foo, B>>(f); //~ ERROR mismatched types
+}
+
+fn have_foo_foo_b(f: Foo<foo, B>) {
+    want::<usize>(f); //~ ERROR mismatched types
+    want::<foo>(f); //~ ERROR mismatched types
+    want::<bar>(f); //~ ERROR mismatched types
+    want::<Foo<usize>>(f); //~ ERROR mismatched types
+    want::<Foo<usize, B>>(f); //~ ERROR mismatched types
+    want::<Foo<foo>>(f); //~ ERROR mismatched types
+    want::<Foo<bar>>(f); //~ ERROR mismatched types
+    want::<Foo<bar, B>>(f); //~ ERROR mismatched types
+    want::<&Foo<foo>>(f); //~ ERROR mismatched types
+    want::<&Foo<foo, B>>(f); //~ ERROR mismatched types
+}
+
+fn have_foo_foo_b_a(f: Foo<foo, B, A>) {
+    want::<usize>(f); //~ ERROR mismatched types
+    want::<foo>(f); //~ ERROR mismatched types
+    want::<bar>(f); //~ ERROR mismatched types
+    want::<Foo<usize>>(f); //~ ERROR mismatched types
+    want::<Foo<usize, B>>(f); //~ ERROR mismatched types
+    want::<Foo<foo>>(f); //~ ERROR mismatched types
+    want::<Foo<foo, B>>(f); //~ ERROR mismatched types
+    want::<Foo<bar>>(f); //~ ERROR mismatched types
+    want::<Foo<bar, B>>(f); //~ ERROR mismatched types
+    want::<&Foo<foo>>(f); //~ ERROR mismatched types
+    want::<&Foo<foo, B>>(f); //~ ERROR mismatched types
+}
+
+fn main() {}