Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// RUN: %clang_cc1 %s -emit-llvm -o - | FileCheck %s union U { int x; char* p; }; void foo(void) { union U bar; // CHECK: call void asm __asm__ volatile("foo %0\n" :: "r"(bar)); }