Add name-colon-bounds test

Let's add a test case using the full `NAME: BOUNDS` syntax to verify
that compilation works and that we get the bounds that we want.

trait-variant/tests/name-colon-bounds.rs

@@ -0,0 +1,65 @@
+// Copyright (c) 2023 Google LLC
+// Copyright (c) 2023 Various contributors (see git history)
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#[trait_variant::make(Trait: Send + Sync)]
+pub trait LocalTrait {
+    const CONST: &'static ();
+    type Gat<'a>
+    where
+        Self: 'a;
+    async fn assoc_async_fn_no_ret(a: (), b: ());
+    async fn assoc_async_method_no_ret(&self, a: (), b: ());
+    async fn assoc_async_fn(a: (), b: ()) -> ();
+    async fn assoc_async_method(&self, a: (), b: ()) -> ();
+    fn assoc_sync_fn_no_ret(a: (), b: ());
+    fn assoc_sync_method_no_ret(&self, a: (), b: ());
+    fn assoc_sync_fn(a: (), b: ()) -> ();
+    fn assoc_sync_method(&self, a: (), b: ()) -> ();
+    // FIXME: See #17.
+    //async fn dft_assoc_async_fn_no_ret(_a: (), _b: ()) {}
+    //async fn dft_assoc_async_method_no_ret(&self, _a: (), _b: ()) {}
+    //async fn dft_assoc_async_fn(_a: (), _b: ()) -> () {}
+    //async fn dft_assoc_async_method(&self, _a: (), _b: ()) -> () {}
+    fn dft_assoc_sync_fn_no_ret(_a: (), _b: ()) {}
+    fn dft_assoc_sync_method_no_ret(&self, _a: (), _b: ()) {}
+    fn dft_assoc_sync_fn(_a: (), _b: ()) -> () {}
+    fn dft_assoc_sync_method(&self, _a: (), _b: ()) -> () {}
+}
+
+impl Trait for () {
+    const CONST: &'static () = &();
+    type Gat<'a> = ();
+    async fn assoc_async_fn_no_ret(_a: (), _b: ()) {}
+    async fn assoc_async_method_no_ret(&self, _a: (), _b: ()) {}
+    async fn assoc_async_fn(_a: (), _b: ()) -> () {}
+    async fn assoc_async_method(&self, _a: (), _b: ()) -> () {}
+    fn assoc_sync_fn_no_ret(_a: (), _b: ()) {}
+    fn assoc_sync_method_no_ret(&self, _a: (), _b: ()) {}
+    fn assoc_sync_fn(_a: (), _b: ()) -> () {}
+    fn assoc_sync_method(&self, _a: (), _b: ()) -> () {}
+}
+
+fn is_bounded<T: Send + Sync>(_: T) {}
+
+#[test]
+fn test() {
+    fn inner<T: Trait>(x: T) {
+        let (a, b) = ((), ());
+        is_bounded(<T as Trait>::assoc_async_fn_no_ret(a, b));
+        is_bounded(<T as Trait>::assoc_async_method_no_ret(&x, a, b));
+        is_bounded(<T as Trait>::assoc_async_fn(a, b));
+        is_bounded(<T as Trait>::assoc_async_method(&x, a, b));
+        // FIXME: See #17.
+        //is_bounded(<T as Trait>::dft_assoc_async_fn_no_ret(a, b));
+        //is_bounded(<T as Trait>::dft_assoc_async_method_no_ret(&x, a, b));
+        //is_bounded(<T as Trait>::dft_assoc_async_fn(a, b));
+        //is_bounded(<T as Trait>::dft_assoc_async_method(&x, a, b));
+    }
+    inner(());
+}