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Rollup merge of #103197 - est31:stabilize_proc_macro_source_text, r=petrochenkov

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Stabilize proc_macro::Span::source_text

Splits `proc_macro::Span::source_text` into a new feature gate and stabilizes it. The [FCP is complete](https://github.com/rust-lang/rust/issues/101991#issuecomment-1279393265).

```Rust
impl Span {
    pub fn source_text(&self) -> Option<String>;
}
```

Closes #101991
This commit is contained in:
Matthias Krüger 2022-10-20 07:58:55 +02:00 committed by GitHub
commit 62bb0c6fdd
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library/proc_macro/src/lib.rs
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@ -546,7 +546,7 @@ impl Span {
/// Note: The observable result of a macro should only rely on the tokens and
/// not on this source text. The result of this function is a best effort to
/// be used for diagnostics only.
#[unstable(feature = "proc_macro_span", issue = "54725")]
#[stable(feature = "proc_macro_source_text", since = "CURRENT_RUSTC_VERSION")]
pub fn source_text(&self) -> Option<String> {
self.0.source_text()
}