Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

ast-dump-types-errors.cpp
// RUN: not %clang_cc1 -triple x86_64-unknown-unknown -fsyntax-only -ast-dump %s | FileCheck %s

void test() {
  using ContainsErrors = int[sizeof(undef())];
  // CHECK: DependentSizedArrayType {{.*}} contains-errors dependent
}