Matthias Krüger 91f222f931
Rollup merge of #111659 - y21:suggest-as-deref, r=cjgillot ...
suggest `Option::as_deref(_mut)` on type mismatch in option combinator if it passes typeck
Fixes #106342 .
This adds a suggestion to call `.as_deref()` (or `.as_deref_mut()` resp.) if typeck fails due to a type mismatch in the function passed to an `Option` combinator such as `.map()` or `.and_then()`.
For example:
```rs
fn foo(_: &str) {}
Some(String::new()).map(foo);
```
The `.map()` method requires its argument to satisfy `F: FnOnce(String)`, but it received `fn(&str)`, which won't pass. However, placing a `.as_deref()` before the `.map()` call fixes this since `&str == &<String as Deref>::Target`
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Matthias Krüger
91f222f931