Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

explicit-build-prefer-self.cpp
// RUN: rm -rf %t
// RUN: %clang_cc1 -fmodules -fno-implicit-modules -emit-module -fmodule-name=a %S/Inputs/explicit-build-prefer-self/map -o %t/a.pcm
// RUN: %clang_cc1 -fmodules -fno-implicit-modules -emit-module -fmodule-name=b %S/Inputs/explicit-build-prefer-self/map -o %t/b.pcm