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Merge #3443 

3443: Document how to lint local Clippy changes with locally built Clippy r=flip1995 a=waynr



Co-authored-by: Wayne Warren <wayne.warren.s@gmail.com>
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bors[bot] 2018-11-21 14:11:24 +00:00
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CONTRIBUTING.md
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@ -152,6 +152,18 @@ Manually testing against an example file is useful if you have added some
local modifications, run `env CLIPPY_TESTS=true cargo run --bin clippy-driver -- -L ./target/debug input.rs`
from the working copy root.
### Linting Clippy with your changes locally
Clippy CI only passes if all lints defined in the version of the Clippy being
tested pass (that is, don’t report any suggestions). You can avoid prolonging
the CI feedback cycle for PRs you submit by running these lints yourself ahead
of time and addressing any issues found:
```
cargo build
`pwd`/target/debug/cargo-clippy clippy --all-targets --all-features -- -D clippy::all -D clippy::internal -D clippy::pedantic
```
### How Clippy works
Clippy is a [rustc compiler plugin][compiler_plugin]. The main entry point is at [`src/lib.rs`][main_entry]. In there, the lint registration is delegated to the [`clippy_lints`][lint_crate] crate.