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rust-clippy/clippy_lints
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bors ffe95252bd Auto merge of #10954 - y21:issue10158, r=llogiq 
[`derivable_impls`]: don't lint if `default()` call expr unsize-coerces to trait object

Fixes #10158.

This fixes a FP where the derive-generated Default impl would have different behavior because of unsize coercion from `Box<T>` to `Box<dyn Trait>`:
```rs
struct S {
  x: Box<dyn std::fmt::Debug>
}
impl Default for S {
  fn default() -> Self {
    Self {
      x: Box::<()>::default()
     // ^~ Box<()> coerces to Box<dyn Debug>
     // #[derive(Default)] would call Box::<dyn Debug>::default()
    }
  }
}
```
(this intentionally only looks for trait objects `dyn` specifically, and not any unsize coercion, e.g. `&[i32; 5]` to `&[i32]`, because that breaks existing tests and isn't actually problematic, as far as I can tell)

changelog: [`derivable_impls`]: don't lint if `default()` call expression unsize-coerces to trait object
2023-06-14 16:59:26 +00:00
..
src Auto merge of #10954 - y21:issue10158, r=llogiq 2023-06-14 16:59:26 +00:00
Cargo.toml Add lint to check lint formulation messages 2023-06-03 00:00:30 +05:30
README.md clippy_lints: readme: don't mention crates.io since it is no longer used to publish clippy. 2020-03-10 01:05:54 +01:00

README.md

This crate contains Clippy lints. For the main crate, check GitHub.