Move /src/test to /tests

tests/ui/impl-trait/diagnostics/fully-qualified-path-impl-trait.rs

@@ -0,0 +1,15 @@
+trait Foo<T> {
+    fn foo(self, f: impl FnOnce());
+}
+
+impl<T> Foo<T> for () {
+    fn foo(self, f: impl FnOnce()) {
+        f()
+    }
+}
+
+fn main() {
+    // FIXME: This should ideally use a fully qualified path
+    // without mentioning the generic arguments of `foo`.
+    ().foo(|| ()) //~ ERROR type annotations needed
+}