bjoernager/rust
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Accept more invalid code that is close to correct fields

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This commit is contained in:
Esteban Küber 2019-01-21 15:28:51 -08:00
parent defa61f3fb
commit 4745b86202
3 changed files with 23 additions and 13 deletions
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22
src/libsyntax/parse/parser.rs
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@ -2695,6 +2695,21 @@ impl<'a> Parser<'a> {
break;
}
let mut recovery_field = None;
if let token::Ident(ident, _) = self.token {
if !self.token.is_reserved_ident() && self.look_ahead(1, |t| *t == token::Colon) {
// Use in case of error after field-looking code: `S { foo: () with a }`
let mut ident = ident.clone();
ident.span = self.span;
recovery_field = Some(ast::Field {
ident,
span: self.span,
expr: self.mk_expr(self.span, ExprKind::Err, ThinVec::new()),
is_shorthand: false,
attrs: ThinVec::new(),
});
}
}
let mut parsed_field = None;
match self.parse_field() {
Ok(f) => parsed_field = Some(f),
@ -2716,11 +2731,14 @@ impl<'a> Parser<'a> {
match self.expect_one_of(&[token::Comma],
&[token::CloseDelim(token::Brace)]) {
Ok(()) => if let Some(f) = parsed_field {
// only include the field if there's no parse error
Ok(()) => if let Some(f) = parsed_field.or(recovery_field) {
// only include the field if there's no parse error for the field name
fields.push(f);
}
Err(mut e) => {
if let Some(f) = recovery_field {
fields.push(f);
}
e.span_label(struct_sp, "while parsing this struct");
e.emit();
self.recover_stmt_(SemiColonMode::Comma, BlockMode::Ignore);