Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// RUN: %clang_cc1 -S -emit-llvm %s -o - | FileCheck %s typedef void (*fptrs_t[4])(void); fptrs_t p __attribute__((noreturn)); void __attribute__((noreturn)) f(void) { p[0](); } // CHECK: call void // CHECK-NEXT: unreachable