Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// RUN: %clang_cc1 -emit-llvm-only %s typedef struct _IO_FILE FILE; int vfprintf(FILE*restrict,const char*restrict, __builtin_va_list); void foo(__builtin_va_list ap) { vfprintf(0, " ", ap); }