Contributing to the Standard Library: best way to run the tests?

I'm working on a PR for std::iter::Iterator. Is there a way for me only run the library's tests? Or do I need to compile the compiler from source, etc. ?

./ test libstd "should" do the minimum required to just test libstd. (You might need a --stage 0 to actually do the minimum, I don't recall.)

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Thanks! I just discovered

You should probably look at the Contribution section in the Rustc Developers Guide.

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