Hi, Recently I upgraded to Xcode 11.0 and re-synced to top-of-tree WebKit. With a clean WebKitBuild directory I'm seeing the following build error: $ ./Tools/Scripts/build-webkit --release > build-log.txt ... In file included from /Users/kbr/src/WebKit/WebKitBuild/Release/DerivedSources/WebKitLegacy/unified-sources/UnifiedSource20-mm.mm:4: /Users/kbr/src/WebKit/Source/WebKitLegacy/mac/WebView/WebHTMLView.mm:222:5: error: use of undeclared identifier '_subviews'; did you mean 'subviews'? _subviews = subviews; ^~~~~~~~~ subviews /Users/kbr/src/WebKit/Source/WebKitLegacy/mac/WebView/WebHTMLView.mm:220:63: note: 'subviews' declared here - (void)_setSubviewsIvar:(NSMutableArray<__kindof NSView *> *)subviews { ^ /Users/kbr/src/WebKit/Source/WebKitLegacy/mac/WebView/WebHTMLView.mm:222:15: error: explicitly assigning value of variable of type 'NSMutableArray<__kindof NSView *> *' to itself [-Werror,-Wself-assign] _subviews = subviews; ~~~~~~~~~ ^ ~~~~~~~~ /Users/kbr/src/WebKit/Source/WebKitLegacy/mac/WebView/WebHTMLView.mm:228:30: error: use of undeclared identifier '_subviews' return (NSMutableArray *)_subviews; ^ 3 errors generated. Has anyone else run into this? Thanks, -Ken