Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// RUN: not %clang_cc1 -std=c++11 %s 2>&1 | FileCheck %s // PR11000: Don't crash. class tuple<> { template <class _Alloc> tuple(allocator_arg_t, const _Alloc&) {} // CHECK: 6 errors generated.