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Nicholas Nethercote
530a73f17e
`LevelSpec` has two related fields, `level` and `lint_id`. This commit makes the fields private (and introduces getters) to ensure they are set together using only valid combinations. The commit also introduces `is_allow` and `is_expect` methods because those are useful.
The driver crate is effectively the "main" function for the rust
compiler. It orchestrates the compilation process and "knits together"
the code from the other crates within rustc. This crate itself does
not contain any of the "main logic" of the compiler (though it does
have some code related to pretty printing or other minor compiler
options).
For more information about how the driver works, see the rustc dev guide.