Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// RUN: %clang_cc1 -x objective-c++ -fblocks -rewrite-objc -fobjc-runtime=macosx-fragile-10.5 -o - %s @interface Foo { void (^_block)(void); } @end @implementation Foo - (void)bar { _block(); } @end