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      1 ; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
      2 ; PR3168
      3 
      4 ; CHECK-LABEL: append
      5 
      6 define i32* @append() gc "ocaml" {
      7 entry:
      8   switch i32 0, label %L2 [i32 0, label %L1]
      9 L1:
     10   %var8 = alloca i8*
     11   call void @llvm.gcroot(i8** %var8,i8* null)
     12   br label %L3
     13 L2:
     14   call ccc void @oread_runtime_casenotcovered()
     15   unreachable
     16 L3:
     17   ret i32* null
     18 }
     19 
     20 declare ccc void @oread_runtime_casenotcovered()
     21 declare void @llvm.gcroot(i8**,i8*)
     22