Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

ifdef.c
// RUN: %clang_cc1 -triple=x86_64-unknown-linux-gnu -emit-llvm -o - %s | FileCheck -check-prefixes=CHECK %s
// RUN: %clang_cc1 -triple=x86_64-unknown-linux-gnu -emit-llvm -o - %s -DFOO | FileCheck -check-prefixes=CHECK,FOO %s

#ifdef FOO
int foo() {
  return 1;
}
#endif

int bar() {
  return 2;
}