Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// RUN: not %clang_cc1 -emit-llvm %s -o - -fprofile-instrument-use-path=%t.nonexistent.profdata 2>&1 | FileCheck %s // CHECK: error: Could not read profile {{.*}}.nonexistent.profdata: // CHECK-NOT: Assertion failed