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Compiler projects using llvm 
# RUN: not llvm-xray stack %s 2>&1 | FileCheck %s
---
header:
  version: 1
  type: 0
  constant-tsc: true
  nonstop-tsc: true
  cycle-frequency: 2601000000
records:
...
# CHECK:     llvm-xray: No instrumented calls were accounted in the input file.
# CHECK-NOT: {{[0-9A-Z]+}}