error: add hint to ProgrammingError As the hint isn't shown by the default exception handler, we need to print it manually. I've copied the "** " style from _exceptionwarning().

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#

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# Avoid interference from actual test env:

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unset HGTEST_JOBS

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unset HGTEST_TIMEOUT

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unset HGTEST_PORT

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unset HGTEST_SHELL