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Add proc_macro::Span::{before, after}. - #86165
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rust-highfive
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Jun 9, 2021
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petrochenkov
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jhpratt
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Jun 13, 2021
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Part of me would prefer this be called Would it makes sense to repurpose these names and provide a generalized Just a random thought I had from a usability perspective; I could certainly get accustomed to the before/after naming. |
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m-ou-se
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Jul 28, 2021
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@jhpratt Since a span is not a point/location but a range, calling it start and end doesn't feel entirely accurate to me. |
m-ou-se
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r? @dtolnay |
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This API looks good to me as implemented.
dtolnay
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Sep 9, 2021
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@bors r+ |
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📌 Commit f9be6cd has been approved by |
bors
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🌲 The tree is currently closed for pull requests below priority 100. This pull request will be tested once the tree is reopened. |
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…arth Rollup of 15 pull requests Successful merges: - rust-lang#85200 (Ignore derived Clone and Debug implementations during dead code analysis) - rust-lang#86165 (Add proc_macro::Span::{before, after}.) - rust-lang#87088 (Fix stray notes when the source code is not available) - rust-lang#87441 (Emit suggestion when passing byte literal to format macro) - rust-lang#88546 (Emit proper errors when on missing closure braces) - rust-lang#88578 (fix(rustc): suggest `items` be borrowed in `for i in items[x..]`) - rust-lang#88632 (Fix issues with Markdown summary options) - rust-lang#88639 (rustdoc: Fix ICE with `doc(hidden)` on tuple variant fields) - rust-lang#88667 (Tweak `write_fmt` doc.) - rust-lang#88720 (Rustdoc coverage fields count) - rust-lang#88732 (RustWrapper: avoid deleted unclear attribute methods) - rust-lang#88742 (Fix table in docblocks) - rust-lang#88776 (Workaround blink/chromium grid layout limitation of 1000 rows) - rust-lang#88807 (Fix typo in docs for iterators) - rust-lang#88812 (Fix typo `option` -> `options`.) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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…tolnay
Add proc_macro::Span::{before, after}.
This adds `proc_macro::Span::before()` and `proc_macro::Span::after()` to get a zero width span at the start or end of the span.
These are equivalent to rustc's `Span::shrink_to_lo()` and `Span::shrink_to_hi()` but with a less cryptic name. They are useful when generating diagnostlics like "missing \<thing\> after \<thing\>".
E.g.
```rust
syn::Error::new(ident.span().after(), "missing `:` after field name").into_compile_error()
```
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This adds
proc_macro::Span::before()andproc_macro::Span::after()to get a zero width span at the start or end of the span.These are equivalent to rustc's
Span::shrink_to_lo()andSpan::shrink_to_hi()but with a less cryptic name. They are useful when generating diagnostlics like "missing <thing> after <thing>".E.g.