Bug 290825 – [TestWTF] Work around compiler bug in TypeCastsCocoa.mm test

• Status: RESOLVED
• Resolution: FIXED
• Component: Tools / Tests

[David Kilzer (:ddkilzer)]

Work around compiler bug in TypeCastsCocoa.mm test from TestWTF.

In TestWTF.TypeCastsCocoa.dynamic_objc_cast_RetainPtr (and TestWTF.TypeCastsCocoaARC.dynamic_objc_cast_RetainPtr), this declaration using `auto` causes the destructor for `object` to be called before `object.get()` when combined with the `WTFMove()` in the previous statement, resulting in `nullptr` being returned.

This was originally worked around in 291650@main for Bug 283039 by removing the `WTFMove()` call in the previous line, but then this code isn't testing `dynamic_objc_cast<T>(RetainPtr<U>&&)` anymore.

A better workaround is to replace `auto` with `RetainPtr<id>` so that we can add back the `WTFMove()` so the test calls the intended function.

```
 TEST(TypeCastsCocoa, dynamic_objc_cast_RetainPtr)
 {
    [...]
    @autoreleasepool {
        auto object = adoptNS<id>([[NSString alloc] initWithFormat:@"%s", helloWorldCString]);   // "Bad" auto
        [...]
        RetainPtr<NSArray> objectCastBad;
        uintptr_t objectPtr2;
        AUTORELEASEPOOL_FOR_ARC_DEBUG {
            objectCastBad = dynamic_objc_cast<NSArray>(WTFMove(object));
            objectPtr2 = reinterpret_cast<uintptr_t>(object.get());   // RetainPtr<id>::~RetainPtr() is called before object.get() here.
        }
        EXPECT_EQ(objectPtr, objectPtr2);
        EXPECT_EQ(nil, objectCastBad.get());
        EXPECT_EQ(1L, CFGetRetainCount((CFTypeRef)objectPtr2)); 
    }
    [...]
}
```

[Radar WebKit Bug Importer]

<rdar://problem/148299583>

[David Kilzer (:ddkilzer)]

Pull request: https://github.com/WebKit/WebKit/pull/43373

[EWS]

Committed 293007@main (89cb37b46594): <https://commits.webkit.org/293007@main>

Reviewed commits have been landed. Closing PR #43373 and removing active labels.