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Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

version-ok.ifs
# RUN: llvm-ifs --input-format=IFS --output-ifs - %s %S/object.ifs

--- !ifs-v1
IfsVersion: 3.0
Target:          x86_64-unknown-linux-gnu
Symbols:
  - { Name: a, Type: Func }
...