Config crate

Ben Boeckelrequested to merge
ben.boeckel/rust-git-checks:config-crate into master

Proof of concept for now. Porting the rest of the code is for later. Based on !143 (merged).

Requires nightly right now due to using std::marker::Unsize. https://github.com/rust-lang/rust/issues/27732 No longer requires nightly; workaround found.

TODO:

  • test the crate with and without the feature flag (see yaml-merge-keys for CI strategy)
Edited by Ben Boeckel

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