Add tests for #12669

crates/ide-diagnostics/src/handlers/inactive_code.rs

@@ -104,6 +104,25 @@ fn f() {
         );
     }
 
+    #[test]
+    fn inactive_assoc_item() {
+        // FIXME these currently don't work, hence the *
+        check(
+            r#"
+struct Foo;
+impl Foo {
+    #[cfg(any())] pub fn f() {}
+  //*************************** weak: code is inactive due to #[cfg] directives
+}
+
+trait Bar {
+    #[cfg(any())] pub fn f() {}
+  //*************************** weak: code is inactive due to #[cfg] directives
+}
+"#,
+        );
+    }
+
     /// Tests that `cfg` attributes behind `cfg_attr` is handled properly.
     #[test]
     fn inactive_via_cfg_attr() {