Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

pragma-mark.c
// RUN: %clang_cc1 %s -fsyntax-only -verify
// expected-no-diagnostics

// Lexer diagnostics shouldn't be included in #pragma mark.
#pragma mark Mike's world
_Pragma("mark foo ' bar")

#define X(S) _Pragma(S)
X("mark foo ' bar")

int i;