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Roy Ivy III authored
* includes a fix/workaround for ongoing `gcc` library issues - see github:rust-lang/rust#47048 and github:rust-lang/rust#53454 - note: this fix is required for successful gcc/gnu compilation of `expr` on windows * improves clarity and logging of the AppVeyor config * "install" phase is more generic and more easily usable within other rust crates
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