Move /src/test to /tests

tests/ui/impl-trait/impl-trait-plus-priority.rs

@@ -0,0 +1,49 @@
+// compile-flags: -Z parse-only
+
+fn f() -> impl A + {} // OK
+fn f() -> impl A + B {} // OK
+fn f() -> dyn A + B {} // OK
+fn f() -> A + B {} // OK
+
+impl S {
+    fn f(self) -> impl A + { // OK
+        let _ = |a, b| -> impl A + {}; // OK
+    }
+    fn f(self) -> impl A + B { // OK
+        let _ = |a, b| -> impl A + B {}; // OK
+    }
+    fn f(self) -> dyn A + B { // OK
+        let _ = |a, b| -> dyn A + B {}; // OK
+    }
+    fn f(self) -> A + B { // OK
+        let _ = |a, b| -> A + B {}; // OK
+    }
+}
+
+type A = fn() -> impl A +;
+//~^ ERROR ambiguous `+` in a type
+type A = fn() -> impl A + B;
+//~^ ERROR ambiguous `+` in a type
+type A = fn() -> dyn A + B;
+//~^ ERROR ambiguous `+` in a type
+type A = fn() -> A + B;
+//~^ ERROR expected a path on the left-hand side of `+`, not `fn() -> A`
+
+type A = Fn() -> impl A +;
+//~^ ERROR ambiguous `+` in a type
+type A = Fn() -> impl A + B;
+//~^ ERROR ambiguous `+` in a type
+type A = Fn() -> dyn A + B;
+//~^ ERROR ambiguous `+` in a type
+type A = Fn() -> A + B; // OK, interpreted as `(Fn() -> A) + B` for compatibility
+
+type A = &impl A +;
+//~^ ERROR ambiguous `+` in a type
+type A = &impl A + B;
+//~^ ERROR ambiguous `+` in a type
+type A = &dyn A + B;
+//~^ ERROR ambiguous `+` in a type
+type A = &A + B;
+//~^ ERROR expected a path on the left-hand side of `+`, not `&A`
+
+fn main() {}