Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// RUN: %clang_cc1 -emit-llvm %s -o %t void f() { int a; if (int x=a) ++a; else a=x; while (int x=a) ++a; for (; int x=a; --a) ; switch (int x=0) { } }