Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

PR2727.c
// RUN: %clang_cc1 -verify -fsyntax-only -std=c90 %s
// RUN: %clang_cc1 -verify -fsyntax-only -std=c99 %s
// expected-no-diagnostics

int f (int x)
{
  // sizeof applied to a type should not delete the type.
  return sizeof (int[x]);
}