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Improve unsafe diagnostic

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This commit is contained in:
threadexception 2021-11-17 16:31:56 +01:00
parent 84826fec95
commit 3a13a72141
2 changed files with 31 additions and 4 deletions
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28
compiler/rustc_parse/src/parser/item.rs
View file

@ -933,10 +933,32 @@ impl<'a> Parser<'a> {
attrs: &mut Vec<Attribute>,
unsafety: Unsafe,
) -> PResult<'a, ItemInfo> {
let sp_start = self.prev_token.span;
let abi = self.parse_abi(); // ABI?
let items = self.parse_item_list(attrs, |p| p.parse_foreign_item(ForceCollect::No))?;
let module = ast::ForeignMod { unsafety, abi, items };
Ok((Ident::empty(), ItemKind::ForeignMod(module)))
match self.parse_item_list(attrs, |p| p.parse_foreign_item(ForceCollect::No)) {
Ok(items) => {
let module = ast::ForeignMod { unsafety, abi, items };
Ok((Ident::empty(), ItemKind::ForeignMod(module)))
}
Err(mut err) => {
let current_qual_sp = self.prev_token.span;
let current_qual_sp = current_qual_sp.to(sp_start);
if let Ok(current_qual) = self.span_to_snippet(current_qual_sp) {
if err.message() == "expected `{`, found keyword `unsafe`" {
let invalid_qual_sp = self.token.uninterpolated_span();
let invalid_qual = self.span_to_snippet(invalid_qual_sp).unwrap();
err.span_suggestion(
current_qual_sp.to(invalid_qual_sp),
&format!("`{}` must come before `{}`", invalid_qual, current_qual),
format!("{} {}", invalid_qual, current_qual),
Applicability::MachineApplicable,
).note("keyword order for functions declaration is `default`, `pub`, `const`, `async`, `unsafe`, `extern`");
}
}
Err(err)
}
}
}
/// Parses a foreign item (one in an `extern { ... }` block).

7
src/test/ui/parser/issues/issue-19398.stderr
View file

@ -4,10 +4,15 @@ error: expected `{`, found keyword `unsafe`
LL | trait T {
| - while parsing this item list starting here
LL | extern "Rust" unsafe fn foo();
| ^^^^^^ expected `{`
| --------------^^^^^^
| | |
| | expected `{`
| help: `unsafe` must come before `extern "Rust"`: `unsafe extern "Rust"`
LL |
LL | }
| - the item list ends here
|
= note: keyword order for functions declaration is `default`, `pub`, `const`, `async`, `unsafe`, `extern`
error: aborting due to previous error