// RUN: %target-sil-opt -enable-sil-verify-all  -sil-verify-without-invalidation %s -compute-dominance-info

// Check if post-dominator verification does not crash on multiple roots.

sil_stage canonical

import Builtin
import Swift

sil @testit : $@convention(thin) () -> () {
bb0:
  cond_br undef, bb1, bb2

bb1:
  br bb1

bb2:
  %r = tuple ()
  return %r : $()
}