Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// RUN: %clang_cc1 %s -O900 -o /dev/null 2>&1 | FileCheck %s // RUN: %clang_cc1 %s -O8 -o /dev/null 2>&1 | FileCheck %s // CHECK: warning: optimization level '-O{{.*}}' is not supported; using '-O3' instead