# Regression report stable-2016-12-21 vs. nightly-2016-12-29

**URL:** <https://internals.rust-lang.org/t/regression-report-stable-2016-12-21-vs-nightly-2016-12-29/4543>\
**Category:** Uncategorized\
**Created:** [December 31, 2016, 12:46am UTC](https://internals.rust-lang.org/t/regression-report-stable-2016-12-21-vs-nightly-2016-12-29/4543 "2016-12-31T00:46:55Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![brson](https://sea2.discourse-cdn.com/flex002/user_avatar/internals.rust-lang.org/brson/32/5197_2.png) [@brson](https://internals.rust-lang.org/u/brson)\
**Post date:** [December 31, 2016, 12:58am UTC](https://internals.rust-lang.org/t/regression-report-stable-2016-12-21-vs-nightly-2016-12-29/4543/2 "2016-12-31T00:58:53Z")

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- type alias never used lint - mio, backtrace, diesel, sprs, sotahyper
- unnecessary qualification lint - nalgebra, libimagestore, rust\_sodium, slack-hook, collenchyma-blas, cudnn, kvm, cuticula, cargo count, cargo graph
- macro already defined in this module - aws-sdk-rust. what’s this?
- mismatched types in string comparison - namedarg\_hack. what’s this?
- false positive - google-container1, google-cloudtrace1-cli
- unused import - perlin. what changed here?
- OUT\_DIR not defined - rasen
  - [https://github.com/rust-lang/cargo/issues/3368](https://github.com/rust-lang/cargo/issues/3368)

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