Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// RUN: %clang_cc1 -emit-llvm %s -o /dev/null @protocol O @end @interface O < O > { } @end struct A { }; @protocol AB - (unsigned) ver; @end @interface AGy:O < AB > { } @end @implementation AGy - (unsigned) ver { } @end