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Description
The dartdoc grinder relies on pub global activate -spath to run against flutter. For some reason, when using the version of pub included with the Dart SDK inside Flutter, this results in excessive precompiling that hangs Travis.
A workaround in #2224 uses the default pub instead, but this isn't correct in reproducing how dartdoc is run by Flutter on their CI. Flutter probably doesn't hit this problem themselves because they use released versions of dartdoc.