[llvm-dev] How to write an 'expected failure test'

[Xing GUO via llvm-dev]

Hi devs,

I want to write a test that expected to fail. And I want to check the error
message. But I found that if the command exit code is not 0, then the test
will fail. Also, if I add `XFAIL: *`, it will not check the command line
output ... Can someone help me?

Best Regards,
Xing
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