Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

instantiate-explicitly-after-fatal.cpp
// RUN: not %clang_cc1 -fsyntax-only -std=c++11 -ferror-limit 1 %s 2>&1 | FileCheck %s
unknown_type foo(unknown_type);
// CHECK: fatal error: too many errors emitted, stopping now

template <typename>
class Bar {};

extern template class Bar<int>;
template class Bar<int>;