Fix hygiene violations in some warnings #63
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Pull request #37 added some must_use warnings conditionalized on the "nightly" feature. However, because proc macros are unhygienic, the warnings were actually conditionalized on the instantiating crate's nightly feature, not on mockall_derive's nightly feature. I didn't notice at the time because Mockall _also_ has a nightly feature, and so does the only crate of mine that uses Mockall. Fix the hygiene errors, and rename mockall_derive's feature to "nightly_derive", which will help to catch similar errors in the future.
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Pull request #37 added some must_use warnings conditionalized on the
"nightly" feature. However, because proc macros are unhygienic, the
warnings were actually conditionalized on the instantiating crate's
nightly feature, not on mockall_derive's nightly feature. I didn't
notice at the time because Mockall also has a nightly feature, and so
does the only crate of mine that uses Mockall.
Fix the hygiene errors, and rename mockall_derive's feature to
"nightly_derive", which will help to catch similar errors in the future.