Sort auto trait and blanket implementations display

[GuillaumeGomez]

Fixes #63042

r? @kinnison

[rust-highfive]

The job x86_64-gnu-llvm-7 of your PR failed (pretty log, raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

2019-12-08T12:57:48.1171760Z ##[command]git remote add origin https://github.com/rust-lang/rust
2019-12-08T12:57:48.1188978Z ##[command]git config gc.auto 0
2019-12-08T12:57:48.1192627Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2019-12-08T12:57:48.1194909Z ##[command]git config --get-all http.proxy
2019-12-08T12:57:48.1201231Z ##[command]git -c http.extraheader="AUTHORIZATION: basic ***" fetch --force --tags --prune --progress --no-recurse-submodules --depth=2 origin +refs/heads/*:refs/remotes/origin/* +refs/pull/67152/merge:refs/remotes/pull/67152/merge
---
2019-12-08T13:03:35.6961203Z    Compiling serde_json v1.0.40
2019-12-08T13:03:37.3861027Z    Compiling tidy v0.1.0 (/checkout/src/tools/tidy)
2019-12-08T13:03:48.1633929Z     Finished release [optimized] target(s) in 1m 26s
2019-12-08T13:03:48.1741288Z tidy check
2019-12-08T13:03:48.8105376Z tidy error: /checkout/src/librustdoc/html/render.rs:2295: line longer than 100 chars
2019-12-08T13:03:50.9029129Z Found 485 error codes
2019-12-08T13:03:50.9029239Z Found 0 error codes with no tests
2019-12-08T13:03:50.9033440Z Done!
2019-12-08T13:03:50.9033494Z some tidy checks failed
2019-12-08T13:03:50.9033494Z some tidy checks failed
2019-12-08T13:03:50.9038792Z 
2019-12-08T13:03:50.9045036Z 
2019-12-08T13:03:50.9051743Z command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/tidy" "/checkout/src" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "--no-vendor"
2019-12-08T13:03:50.9052257Z 
2019-12-08T13:03:50.9052294Z 
2019-12-08T13:03:50.9077043Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test src/tools/tidy
2019-12-08T13:03:50.9077122Z Build completed unsuccessfully in 0:01:30
2019-12-08T13:03:50.9077122Z Build completed unsuccessfully in 0:01:30
2019-12-08T13:03:50.9111204Z == clock drift check ==
2019-12-08T13:03:50.9125953Z   local time: Sun Dec  8 13:03:50 UTC 2019
2019-12-08T13:03:51.0422610Z   network time: Sun, 08 Dec 2019 13:03:51 GMT
2019-12-08T13:03:51.0427394Z == end clock drift check ==
2019-12-08T13:03:52.4660629Z 
2019-12-08T13:03:52.4768256Z ##[error]Bash exited with code '1'.
2019-12-08T13:03:52.4797707Z ##[section]Starting: Checkout
2019-12-08T13:03:52.4799647Z ==============================================================================
2019-12-08T13:03:52.4799702Z Task         : Get sources
2019-12-08T13:03:52.4799765Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[kinnison]

@GuillaumeGomez Is there a useful way to add a test for this?

[GuillaumeGomez]

We could through the UI tests. Still kinda blocked for the moment until highfive is fixed...

[kinnison]

I can confirm that the code seems to provide sorted auto-trait and blanket impls.

I'm not fond of the crate fn foo() syntax, though I appreciate it's the style in the code at the moment, it'd be nice if new code were pub(crate) fn foo() in future. No need to change things on this PR though.

[kinnison]

@bors r+

[bors]

📌 Commit 9e3e421 has been approved by kinnison