tree a6c57b53a9b63a98bb9eee151d907007d59e977d
parent 351e5a13850af3f9ec77e2a59d36fc7383be91b9
author David Tolnay <dtolnay@gmail.com> 1565971357 -0700
committer David Tolnay <dtolnay@gmail.com> 1565971373 -0700
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Fail better on some old compilers

This message will appear on 1.22 through 1.26. Before 1.22, the build.rs
does not compile. On 1.27 through 1.30 it never runs because editions
are detected as unstable.