Mitchell Hentges 07133c01bc Bug 1656403: Configure should reject potentially-out-of-date nightlies r=firefox-build-system-reviewers,froydnj
We have a minimum rust version required for compilations. For both stable and beta rust compilers, we can trust that they will have all the stabilized features we're expecting.
However, for nightlies, they may "match" our minimum version, but may have been released in the version window before a certain feature we need has been stabilized.
So, when validating rustc version in configure, ensure that the nightly is at least one version newer than our expected version.

Differential Revision: https://phabricator.services.mozilla.com/D86889
2020-08-21 19:19:36 +00:00
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