Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// RUN: %clang_cc1 -std=c++1z -fsyntax-only -verify %s namespace decomp_decl { void f() { auto [this_is_a_typo] = this_is_a_typp(); // expected-error{{use of undeclared identifier 'this_is_a_typp'}} } }