custom rustc lints

How to use these lint framework

1. add this crate as dependency on Cargo.toml
2. add #![plugin(lints)] to your crate root like <examples/compiler_plugin.rs>
3. cargo check # would apply lints from plugin crate

How to run ui_test

cargo test -- --nocapture

How to run(may not work or crate std not found)

in rust project directory you want to analyze

compile lints package rustc_ binary and set env RUSTC to rustc_ binary path, e.g. mac/linux:

RUSTC=/path/to/rustc_ cargo check

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road map

• add f32 cast to f64 precession lost lint(check f32 cast to f64 and warn precession lost(clippy::pedantic has f64 as f32 checking))
• add ui_test similar to dylint::ui_test or rustc/clippy ui_test
• use a readable diff tool for ui test, better than dtolnay/dissimilar used by rust-analyzer