Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

nm-trivial-object-arm64_32.test
RUN: llvm-nm -arch arm64_32 %p/../Inputs/trivial-object-test.macho-arm64_32 \
RUN:   | FileCheck %s

CHECK: 00000000 T _foo
CHECK: 00000000 t ltmp0