Commits on Sep 1, 2017

1. efficacious `#[must_use]` methods for nightly, fix warnings …

   137660d annotated many methods with `#[must_use]`, but despite not
   being rejected by the compiler, this is actually a no-op (as of Rust
   1.20). `#[must_use]` for functions is now available on nightly
   Rust (since rust-lang/rust@3645b06), under a feature-gate (since
   rust-lang/rust@8492ad2 and 35c44941), with a warning if `#[must_use]`
   appears on a function or method without the feature being enabled—a
   warning that regrettably added a lot of noise to Euclid's build, as
   reported in rust-lang/rust#44213. But with judicious use of `cfg_attr`,
   Euclid can make use of this functionality if our "unstable" feature is
   enabled, and shut up the warnings in any case.

   

   zackmdavis committed Sep 1, 2017

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