# Regression report stable-2015-10-29 vs. beta-2015-11-05 vs nightly-2015-11-19 **URL:** \ **Category:** Uncategorized\ **Created:** [November 21, 2015, 12:55am UTC](https://internals.rust-lang.org/t/regression-report-stable-2015-10-29-vs-beta-2015-11-05-vs-nightly-2015-11-19/2922 "2015-11-21T00:55:25Z")\ **Posts on this page:** 8\ **Page:** 1
**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:** [November 21, 2015, 12:55am UTC](https://internals.rust-lang.org/t/regression-report-stable-2015-10-29-vs-beta-2015-11-05-vs-nightly-2015-11-19/2922/1 "2015-11-21T00:55:25Z")
[stable-2015-10-29 vs. beta-2015-11-05](https://gist.github.com/brson/0fa58baaf7c92277a462). [stable-2015-10-29 vs. nightly-2015-11-19](https://gist.github.com/brson/f017be3b0f341e3bcc98). ## Beta root regressions, sorted by rank: - [nanovg-0.3.0](https://crates.io/crates/nanovg) ([before](https://tools.taskcluster.net/task-inspector/#zyMD4bKSQhiMTNB8zCPe4Q)) ([after](https://tools.taskcluster.net/task-inspector/#eKR8EPnDQS6ahwV3782cXg)) - [cudd-sys-0.1.0](https://crates.io/crates/cudd-sys) ([before](https://tools.taskcluster.net/task-inspector/#E0VojVZ_TtSbKmdmjkiBjg)) ([after](https://tools.taskcluster.net/task-inspector/#YtyysTmtQ7GhTapEfcMnsg)) - [pinyin-0.0.4](https://crates.io/crates/pinyin) ([before](https://tools.taskcluster.net/task-inspector/#JDjphMm2QC2XSsinbK2dUg)) ([after](https://tools.taskcluster.net/task-inspector/#vaDviVfuR36MLVtFLojUQw)) - [fastcgi-1.0.0-alpha.2](https://crates.io/crates/fastcgi) ([before](https://tools.taskcluster.net/task-inspector/#Q6MDMdlmTRemLYbhMEvY4w)) ([after](https://tools.taskcluster.net/task-inspector/#UFrxvFvwQ06FD2XbAdvCCw)) - [ao-0.6.1](https://crates.io/crates/ao) ([before](https://tools.taskcluster.net/task-inspector/#K1SiLwYjTVqLiNFabww91g)) ([after](https://tools.taskcluster.net/task-inspector/#5S5JDAEPQ_yxzZIfLQo91w)) ## Nightly root regressions, sorted by rank: - [lru\_time\_cache-0.2.4](https://crates.io/crates/lru_time_cache) ([before](https://tools.taskcluster.net/task-inspector/#7WJftWKQQc24sE_8hIiQSQ)) ([after](https://tools.taskcluster.net/task-inspector/#BdJzhCXVRmOzgSWwGFXG3Q)) - [glib-0.0.5](https://crates.io/crates/glib) ([before](https://tools.taskcluster.net/task-inspector/#hERb0m_iQ_-Y8I9bofsS3g)) ([after](https://tools.taskcluster.net/task-inspector/#x4zJubNdRJWKDOJKaBvTdg)) - [message\_filter-0.1.5](https://crates.io/crates/message_filter) ([before](https://tools.taskcluster.net/task-inspector/#IbK8r9o7RU2nPYWbAMjsYg)) ([after](https://tools.taskcluster.net/task-inspector/#lijghRyFQG-w7obqdyP4CQ)) - [nanovg-0.3.0](https://crates.io/crates/nanovg) ([before](https://tools.taskcluster.net/task-inspector/#zyMD4bKSQhiMTNB8zCPe4Q)) ([after](https://tools.taskcluster.net/task-inspector/#yVlfdQZyT1mJwt83vSzhlw)) - [syncbox-0.2.4](https://crates.io/crates/syncbox) ([before](https://tools.taskcluster.net/task-inspector/#dG-MMDHKTnivaeptDVmzkA)) ([after](https://tools.taskcluster.net/task-inspector/#Y2j5n1UPQXCXBccQP9OPWw)) - [tcod-0.8.0](https://crates.io/crates/tcod) ([before](https://tools.taskcluster.net/task-inspector/#2Vnq_n9kQtmLhw8UvlgM9w)) ([after](https://tools.taskcluster.net/task-inspector/#eBNddXw_TMGqrv7ep7zkaA)) - [maidsafe\_utilities-0.1.2](https://crates.io/crates/maidsafe_utilities) ([before](https://tools.taskcluster.net/task-inspector/#MNh58hxjQkqWh7XRClIJ_A)) ([after](https://tools.taskcluster.net/task-inspector/#bnyMk-rBSn6QtA3VFntGWw)) - [cudd-sys-0.1.0](https://crates.io/crates/cudd-sys) ([before](https://tools.taskcluster.net/task-inspector/#E0VojVZ_TtSbKmdmjkiBjg)) ([after](https://tools.taskcluster.net/task-inspector/#N8h15puFR8G5KORPNNO8iA)) - [pinyin-0.0.4](https://crates.io/crates/pinyin) ([before](https://tools.taskcluster.net/task-inspector/#JDjphMm2QC2XSsinbK2dUg)) ([after](https://tools.taskcluster.net/task-inspector/#N1Hvz4FQQ1CHTXUAS_ySZg)) - [ao-0.6.1](https://crates.io/crates/ao) ([before](https://tools.taskcluster.net/task-inspector/#K1SiLwYjTVqLiNFabww91g)) ([after](https://tools.taskcluster.net/task-inspector/#91prVo0gQDKPxwc_rA3epQ)) - [bud-0.0.1](https://crates.io/crates/bud) ([before](https://tools.taskcluster.net/task-inspector/#-zpWjOt4RtyUEDypqKn4Hw)) ([after](https://tools.taskcluster.net/task-inspector/#3LioRZzJRIqWK4XkyE65Ew)) - [fastcgi-1.0.0-alpha.2](https://crates.io/crates/fastcgi) ([before](https://tools.taskcluster.net/task-inspector/#Q6MDMdlmTRemLYbhMEvY4w)) ([after](https://tools.taskcluster.net/task-inspector/#o6-tkGYgQ2-vdqbx3iY-zg)) # Analysis I’ve only given a brief look at the betas, not nightlies. - “unnecessary parens around `for` head expression” - nanovg. lint change - “attribute should be applied to struct or enum” - cudd-sys. bug fix? - “cannot infer appropriate lifetime” - pinyin. what’s this? - “type annotations required” - fastcgi. what’s this? - “attribute should be applied to function” - ao. similar bug fix to cudd-sys Anybody know offhand what caused these? cc @nikomatsakis there are two typecheck failures here. ---
**Author:** ![eefriedman](https://avatars.discourse-cdn.com/v4/letter/e/ec9cab/32.png) [@eefriedman](https://internals.rust-lang.org/u/eefriedman)\ **Post date:** [November 21, 2015, 1:20am UTC](https://internals.rust-lang.org/t/regression-report-stable-2015-10-29-vs-beta-2015-11-05-vs-nightly-2015-11-19/2922/2 "2015-11-21T01:20:59Z")
- “attribute should be applied to struct or enum” - “attribute should be applied to function” Yes; we were missing a check to make sure the attribute wasn’t just being ignored. See [https://github.com/rust-lang/rust/pull/28650](https://github.com/rust-lang/rust/pull/28650) . If this is causing too many regressions, we could probably make it a soft error. pinyin is being tracked at [https://github.com/rust-lang/rust/issues/28853](https://github.com/rust-lang/rust/issues/28853) . Not sure what the fastcgi regression is; I think it reduces to this: ```rust use std::io::{Read, Cursor}; fn main() { let x = Vec::new(); let _x: &mut Read = &mut Cursor::new(x.as_ref()); } ``` ---
**Author:** ![eefriedman](https://avatars.discourse-cdn.com/v4/letter/e/ec9cab/32.png) [@eefriedman](https://internals.rust-lang.org/u/eefriedman)\ **Post date:** [November 21, 2015, 1:30am UTC](https://internals.rust-lang.org/t/regression-report-stable-2015-10-29-vs-beta-2015-11-05-vs-nightly-2015-11-19/2922/3 "2015-11-21T01:30:25Z")
The glib regression is [https://github.com/rust-lang/rust/issues/29857](https://github.com/rust-lang/rust/issues/29857) . tcod is getting hit by the new AsRef implementation on Box. ---
**Author:** ![bluss](https://sea2.discourse-cdn.com/flex002/user_avatar/internals.rust-lang.org/bluss/32/2264_2.png) [@bluss](https://internals.rust-lang.org/u/bluss)\ **Post date:** [November 21, 2015, 1:47am UTC](https://internals.rust-lang.org/t/regression-report-stable-2015-10-29-vs-beta-2015-11-05-vs-nightly-2015-11-19/2922/4 "2015-11-21T01:47:26Z")
For pinyin, the affected code looks like: ```rust let py = re_phonetic_symbol.replace_all(&p, |caps: &Captures| { let cap = caps.at(0).unwrap(); let symbol = match PHONETIC_SYMBOL_MAP.get(&cap) { Some(&v) => v, None => "", }; ``` The error is: ```rust src/lib.rs:157:24: 157:29 error: cannot infer an appropriate lifetime for lifetime parameter `'t` due to conflicting req uirements [E0495] src/lib.rs:157 let cap = caps.at(0).unwrap(); ^ ~~~~ ``` `Captures` is: `impl<'t> Captures<'t>` And the method has signature: `fn at(&self, i: usize) -> Option<&'t str>` Something must have changed in how the explicit type `caps: &Captures` in the closure is treated? I’ve submitted a PR to fix the crate by a very simple change, `cap` instead of `&cap` [(PR)](https://github.com/mozillazg/rust-pinyin/pull/1). So, why does this work? ---
**Author:** ![arielb1](https://sea2.discourse-cdn.com/flex002/user_avatar/internals.rust-lang.org/arielb1/32/3044_2.png) [@arielb1](https://internals.rust-lang.org/u/arielb1)\ **Post date:** [November 21, 2015, 6:02pm UTC](https://internals.rust-lang.org/t/regression-report-stable-2015-10-29-vs-beta-2015-11-05-vs-nightly-2015-11-19/2922/5 "2015-11-21T18:02:27Z")
I documented the pinyin regression at [https://github.com/rust-lang/rust/issues/28854](https://github.com/rust-lang/rust/issues/28854) - this is an unfortunate interaction of “bridge” impls causing a deref coercion to be skipped and the lack of subtyping in trait matching - the code used to work because of a soundness hole. ---
**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 11, 2015, 10:29pm UTC](https://internals.rust-lang.org/t/regression-report-stable-2015-10-29-vs-beta-2015-11-05-vs-nightly-2015-11-19/2922/6 "2015-12-11T22:29:09Z")
maidsafe\_utilities is because raw\_pointer\_derive was [removed](https://github.com/rust-lang/rust/pull/29882). ---
**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:** [January 6, 2016, 7:50pm UTC](https://internals.rust-lang.org/t/regression-report-stable-2015-10-29-vs-beta-2015-11-05-vs-nightly-2015-11-19/2922/7 "2016-01-06T19:50:10Z")
The tcod regression is on 1.5 stable: [https://github.com/rust-lang/rust/issues/30744](https://github.com/rust-lang/rust/issues/30744) ---
**Author:** ![system](https://sea2.discourse-cdn.com/flex002/user_avatar/internals.rust-lang.org/system/32/14092_2.png) [@system](https://internals.rust-lang.org/u/system)\ **Post date:** [March 25, 2019, 8:25am UTC](https://internals.rust-lang.org/t/regression-report-stable-2015-10-29-vs-beta-2015-11-05-vs-nightly-2015-11-19/2922/8 "2019-03-25T08:25:29Z")
This topic was automatically closed 90 days after the last reply. New replies are no longer allowed.