Adding lint test for excessive LOC.
This is a WIP for #2377. Just wanted to pull in because I had a few questions:
1. Is it okay that I'm approaching this via counting by looking at each line in the snippet instead of looking at the AST tree? If there's another way to do it, I want to make sure I'm doing the correct way, but I wasn't sure since the output AST JSON doesn't seem to contain whitespace.
2. My function is definitely going to trigger the lint, so also wanted to see if there was something obvious I could do to reduce it.
3. Are the two tests fine, or is there something obvious I'm missing?
4. Obviously bigger question - am I approaching the line count correctly. Current strategy is count a line if it contains some code, so skip if it's just comments or empty.
Travis: Don't run integration tests on every PR commit
This does not save Clippy any time but it makes sure that the concurrent
build limit is not reached as quickly for the `rust-lang` Travis
account.
I can't create a permalink to the discussion somehow, so here's an
excerpt from the Infra channel:
```
[11:57 PM] pietroalbini: there is a clippy build (20 jobs) and a packed_simd one (42 builders) and a rustc one which isn't scheduling atm
[11:58 PM] pietroalbini: I don't think there is a way to prioritize rustc builds in the queue on travis, right?
[12:22 AM] alexcrichton: pietro: I don't think so no
[12:22 AM] alexcrichton: If it's a problem we should cull builds on other projects
[12:22 AM] alexcrichton: The rust repo is the #1 priority
```
Since the integration tests are rarely failing these days, I think it's
fine to not run them on every commit.
If needed, it's also still possible to do a complete test run with `@bors try`.
Fix ICE in vec_box lint and add run-rustfix
Includes https://github.com/rust-lang/rust-clippy/pull/3726
`hir::Ty` doesn't seem to know anything about type bounds and
`cx.tcx.type_of(def_id)` caused an ICE when it was passed a generic type
with a bound:
```
src/librustc_typeck/collect.rs:1311: unexpected non-type Node::GenericParam: Type { default: None, synthetic: None }
```
Converting it to a proper `Ty` fixes the ICE and catches a few more places
where the lint applies.
Fixes#3720
`hir::Ty` doesn't seem to know anything about type bounds and
`cx.tcx.type_of(def_id)` caused an ICE when it was passed a generic type
with a bound:
```
src/librustc_typeck/collect.rs:1311: unexpected non-type Node::GenericParam: Type { default: None, synthetic: None }
```
Converting it to a proper `Ty` fixes the ICE and catches a few more
places where the lint applies.
This does not save Clippy any time but it makes sure that the concurrent
build limit is not reached as quickly for the `rust-lang` Travis
account.
I can't create a permalink to the discussion somehow, so here's an
excerpt from the Infra channel:
```
[11:57 PM] pietroalbini: there is a clippy build (20 jobs) and a packed_simd one (42 builders) and a rustc one which isn't scheduling atm
[11:58 PM] pietroalbini: I don't think there is a way to prioritize rustc builds in the queue on travis, right?
[12:22 AM] alexcrichton: pietro: I don't think so no
[12:22 AM] alexcrichton: If it's a problem we should cull builds on other projects
[12:22 AM] alexcrichton: The rust repo is the #1 priority
```
Since the integration tests are rarely failing these days, I think it's
fine to not run them on every commit.
If needed, it's also still possible to do a `try` build with `@bors try`.
Add wildcard_match_arm lint
This lint prevents using a wildcard in a match arm. Implemented as a restriction currently, because this is pretty much an edge case. See #3649 for more information.
Didn't add any tests because I wasn't sure how, but if someone wants to point me in the right direction, I'd be happy to!
Add initial version of const_fn lint
This adds an initial version of a lint that can tell if a function could be `const`.
TODO:
- [x] Finish up the docs
- [x] Fix the ICE
cc #2440
