Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// RUN: %clang_cc1 %s -E -CC -pedantic -verify // expected-no-diagnostics #if 1 /*bar */ #endif /*foo*/ #if /*foo*/ defined /*foo*/ FOO /*foo*/ #if /*foo*/ defined /*foo*/ ( /*foo*/ FOO /*foo*/ ) /*foo*/ #endif #endif