llvm-project/llvm/test/CodeGen/MIR/machine-basic-block-undefined-ir-block.mir

# RUN: not llc -start-after branch-folder -stop-after branch-folder -o /dev/null %s 2>&1 | FileCheck %s

--- |

  define i32 @foo() {
    ret i32 0
  }

...
---
name:            foo
body:
 - id:           0
# CHECK: [[@LINE+1]]:19: use of undefined IR block '%ir-block.10'
   ir-block:     '%ir-block.10'
...