Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

shadowed-submodule.m
// RUN: rm -rf %t
// RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -I %S/Inputs/shadowed-submodule/Foo -I %S/Inputs/shadowed-submodule/A2 %s -verify

@import Foo; // expected-error {{module 'A' was built in directory}}
             // expected-note@shadowed-submodule.m:4 {{imported by module 'Foo'}}