Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
RUN: llvm-cxxfilt -n _Z1fi __Z1fi f ___ZSt1ff_block_invoke | FileCheck %s CHECK: f(int) CHECK-NEXT: __Z1fi CHECK-NEXT: f CHECK-NEXT: invocation function for block in std::f(float)