| Age | Commit message (Collapse) | Author | Lines |
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implement #123558
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methods on non-`Iterator`
```
error[E0599]: no method named `map` found for struct `Vec<bool>` in the current scope
--> $DIR/vec-on-unimplemented.rs:3:23
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LL | vec![true, false].map(|v| !v).collect::<Vec<_>>();
| ^^^ `Vec<bool>` is not an iterator
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help: call `.into_iter()` first
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LL | vec![true, false].into_iter().map(|v| !v).collect::<Vec<_>>();
| ++++++++++++
```
We used to provide some help through `rustc_on_unimplemented` on non-`impl Trait` and non-type-params, but this lets us get rid of some otherwise unnecessary conditions in the annotation on `Iterator`.
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```
error[E0277]: the size for values of type `[i32]` cannot be known at compilation time
--> f100.rs:2:33
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2 | let _ = std::mem::size_of::<[i32]>();
| ^^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `[i32]`
note: required by an implicit `Sized` bound in `std::mem::size_of`
--> /home/gh-estebank/rust/library/core/src/mem/mod.rs:312:22
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312 | pub const fn size_of<T>() -> usize {
| ^ required by the implicit `Sized` requirement on this bound in `size_of`
```
Fix #120178.
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When encountering a type mismatch error involving `dyn Trait`, mention
the existence of boxed trait objects if the other type involved
implements `Trait`.
Partially addresses #102629.
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Co-authored-by: Adrian <adrian.iosdev@gmail.com>
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The previous output was unintuitive to users.
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