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bors 88197214b8 Auto merge of #75573 - Aaron1011:feature/const-mutation-lint, r=oli-obk 
Add CONST_ITEM_MUTATION lint

Fixes #74053
Fixes #55721

This PR adds a new lint `CONST_ITEM_MUTATION`.
Given an item `const FOO: SomeType = ..`, this lint fires on:

* Attempting to write directly to a field (`FOO.field = some_val`) or
  array entry (`FOO.array_field[0] = val`)
* Taking a mutable reference to the `const` item (`&mut FOO`), including
  through an autoderef `FOO.some_mut_self_method()`

The lint message explains that since each use of a constant creates a
new temporary, the original `const` item will not be modified.
2020-09-10 05:54:26 +00:00
..
benches
src Auto merge of #75573 - Aaron1011:feature/const-mutation-lint, r=oli-obk 2020-09-10 05:54:26 +00:00
Cargo.toml Refactor byteorder to std in rustc_middle 2020-09-04 21:51:17 -07:00
README.md

README.md

For more information about how rustc works, see the rustc dev guide.