Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
; RUN: not llvm-as < %s -o /dev/null 2>&1 | FileCheck %s ; CHECK: Attribute 'byval(i32)' applied to incompatible type! ; CHECK-NEXT: ptr @h declare void @h(i32 byval(i32) %num)