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Keep the spans for generics coming from a `derive`d Item, so that errors
and suggestions have better detail.
Fix #84003.
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When there are multiple macros in use, it can be difficult to tell
which one was responsible for producing an error.
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If a symbol name can only be imported from one place for a type, and
as long as it was not glob-imported anywhere in the current crate, we
can trim its printed path and print only the name.
This has wide implications on error messages with types, for example,
shortening `std::vec::Vec` to just `Vec`, as long as there is no other
`Vec` importable anywhere.
This adds a new '-Z trim-diagnostic-paths=false' option to control this
feature.
On the good path, with no diagnosis printed, we should try to avoid
issuing this query, so we need to prevent trimmed_def_paths query on
several cases.
This change also relies on a previous commit that differentiates
between `Debug` and `Display` on various rustc types, where the latter
is trimmed and presented to the user and the former is not.
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- reword messages
- apply custom comments to all types of ranges
- fix indentation
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- Detect one element array of `Range` type, which is potentially a typo:
`for _ in [0..10] {}` where iterating between `0` and `10` was intended.
(#23141)
- Suggest `.bytes()` and `.chars()` for `String`.
- Suggest borrowing or `.iter()` on arrays (#36391)
- Suggest using range literal when iterating on integers (#34353)
- Do not suggest `.iter()` by default (#50773, #46806)
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