cargo-mutants doesn't work on tarpaulin tree

[sourcefrog]

So tarpaulin tests instrument binaries with breakpoints and do coverage which involves intercepting signals going to the process and handling them in code. There's a possibility I'm intercepting the cargo mutants kill signal and then failing the test because it's got an unexpected termination signal 🤔

Reproducing is pretty simple, it's just cloning tarpaulin and running cargo mutants on it

git clone --depth 1 https://github.com/xd009642/tarpaulin
cd tarpaulin
cargo mutants --in-place 

Originally posted by @xd009642 in #348 (comment)

[sourcefrog]

@xd009642 I can reproduce this; I haven't looked into why yet. I see a bunch of test failures during the baseline test. Since it isn't timing out, it should not be getting signaled. I guess something else about the environment where cargo-mutants runs it might be causing a problem?

I will look into it some more when I get a chance, but if you want to investigate then a good place to start would be to get the command that it runs from mutants.out/debug.log and run that yourself, and see if it causes the same failure.