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Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

p5.mm
// RUN: %clang_cc1 -fobjc-exceptions -fexceptions -std=c++11 -fblocks -fsyntax-only -verify %s

template<typename...Types>
void f(Types ...values) {
  for (id x in values) { } // expected-error {{expression contains unexpanded parameter pack 'values'}}
  @synchronized(values) { // expected-error {{expression contains unexpanded parameter pack 'values'}}
    @throw values; // expected-error {{expression contains unexpanded parameter pack 'values'}}
  }
}