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      1 ; RUN: opt < %s -lowerswitch -disable-output
      2 
      3 ; This test verify -lowerswitch does not crash after deleting the default block.
      4 
      5 declare i32 @f(i32)
      6 
      7 define i32 @unreachable(i32 %x) {
      8 
      9 entry:
     10   switch i32 %x, label %unreachable [
     11     i32 5, label %a
     12     i32 6, label %a
     13     i32 7, label %a
     14     i32 10, label %b
     15     i32 20, label %b
     16     i32 30, label %b
     17     i32 40, label %b
     18   ]
     19 unreachable:
     20   unreachable
     21 a:
     22   %0 = call i32 @f(i32 0)
     23   ret i32 %0
     24 b:
     25   %1 = call i32 @f(i32 1)
     26   ret i32 %1
     27 }
     28