Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// RUN: %clang_cc1 -fsyntax-only -verify %s struct A {}; int i = __real__ A(); // expected-error {{invalid type 'A' to __real operator}} int j = __imag__ A(); // expected-error {{invalid type 'A' to __imag operator}}