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Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

2008-10-15-MissingSpace.ll
; RUN: llvm-as < %s | llvm-dis | FileCheck %s
; PR2894
declare void @g()
define void @f() personality i32 (...)* @__gxx_personality_v0 {
; CHECK:  invoke void @g()
; CHECK:           to label %d unwind label %c
  invoke void @g() to label %d unwind label %c
d:
  ret void
c:
  %exn = landingpad {i8*, i32}
            cleanup
  ret void
}

declare i32 @__gxx_personality_v0(...)