MozillaBuild 4.0.1 is a small patch containing a couple bug fixes introduced in the MozillaBuild 4.0 Release. I advise upgrading it at your earliest convenience.
Quick Overview:
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hg tab completions work again
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shebang of 'Scripts\hg` now points to the correct python.exe
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watchman has been upgraded to a much newer version (v2022.04.11.00)
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The warning message for doing a “pave over install” of MozillaBuild now warns of the risk of instability for doing so.
Upgrade instructions are here, the full changelog is here, and you can download MozillaBuild 4.0.1 from here.
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Alex Hochheiden
Engineering Workflow
Mozilla