Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
#define FOO(X) X #if FOO( #elif FOO( #endif // RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:2:9 %s // RUN: not %clang_cc1 -fsyntax-only -code-completion-at=%s:3:11 %s