[issue40551] PRs should be rebased on top of master before running the build/tests

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

I don't think this is a real issue we should solve:

* Travis-CI, at least, does test against "merge commit", not HEAD of PR branch.
* As you said already, master branch grow after PR is created anyway.
* We run CI and buildbots against master branch too.  So we can find breakage soon when something go wrong.

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nosy: +inada.naoki

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