Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
# RUN: not llvm-mc -triple i386-unknown-unknown %s 2>&1 | FileCheck %s .macro foo .err .endm .purgem bar # CHECK: error: macro 'bar' is not defined .purgem foo foo # CHECK: error: invalid instruction mnemonic 'foo'