Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// RUN: %clang_cc1 -O0 -emit-llvm -o - %s | FileCheck %s kernel void kernel1(int a) {} // CHECK: define{{.*}}@kernel1{{.*}}#[[ATTR:[0-9]*]] // CHECK: attributes #[[ATTR]] = {{.*}}norecurse