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Properly recover from trailing attr in body

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When encountering an attribute in a body, we try to recover from an
attribute on an expression (as opposed to a statement). We need to
properly clean up when the attribute is at the end of the body where a
tail expression would be.

Fix #118164.
This commit is contained in:
Esteban Küber 2023-11-22 19:53:24 +00:00
parent e7bbe8ce93
commit a5d9def321
3 changed files with 53 additions and 2 deletions
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19
compiler/rustc_parse/src/parser/diagnostics.rs
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@ -792,13 +792,28 @@ impl<'a> Parser<'a> {
&& let [segment] = &attr_kind.item.path.segments[..]
&& segment.ident.name == sym::cfg
&& let Some(args_span) = attr_kind.item.args.span()
&& let Ok(next_attr) = snapshot.parse_attribute(InnerAttrPolicy::Forbidden(None))
&& let next_attr = match snapshot.parse_attribute(InnerAttrPolicy::Forbidden(None))
{
Ok(next_attr) => next_attr,
Err(inner_err) => {
err.cancel();
inner_err.cancel();
return;
}
}
&& let ast::AttrKind::Normal(next_attr_kind) = next_attr.kind
&& let Some(next_attr_args_span) = next_attr_kind.item.args.span()
&& let [next_segment] = &next_attr_kind.item.path.segments[..]
&& segment.ident.name == sym::cfg
&& let Ok(next_expr) = snapshot.parse_expr()
{
let next_expr = match snapshot.parse_expr() {
Ok(next_expr) => next_expr,
Err(inner_err) => {
err.cancel();
inner_err.cancel();
return;
}
};
// We have for sure
// #[cfg(..)]
// expr