Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

diag-crash.c
// RUN: %clang_cc1 -fsyntax-only -verify %s

// Avoid preprocessor diag crash caused by a parser diag left in flight.

int foo: // expected-error {{expected ';' after top level declarator}}
#endif   // expected-error {{#endif without #if}}