Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
; RUN: not llvm-as < %s > /dev/null 2>&1 declare void @llvm.gcroot(ptr, ptr) nounwind define void @f() gc "x" { %st = alloca { ptr, i1 } ; <ptr> [#uses=1] call void @llvm.gcroot(ptr %st, ptr null) ret void }