std: Synchronize access to global env during `exec` #55939

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bors merged 2 commits intorust-lang:masterfrom

alexcrichton:path-regression-again

Nov 15, 2018

Commits on Nov 14, 2018

Revert "Fixes #46775 -- don't mutate the process's environment in Command::exec"
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std: Synchronize access to global env during `exec`

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