Eat open paren when parsing list in libsyntax/parse/attr.rs #43904
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Aug 18, 2017
Eat open paren when parsing list in libsyntax/parse/attr.rs
This PR adds a small refactoring:
```diff
pub fn parse_meta_item_kind(&mut self) -> PResult<'a, ast::MetaItemKind> {
Ok(if self.eat(&token::Eq) {
ast::MetaItemKind::NameValue(self.parse_unsuffixed_lit()?)
- } else if self.token == token::OpenDelim(token::Paren) {
+ } else if self.eat(&token::OpenDelim(token::Paren)) {
ast::MetaItemKind::List(self.parse_meta_seq()?)
} else {
- self.eat(&token::OpenDelim(token::Paren));
ast::MetaItemKind::Word
})
}
```
in `parse_meta_item_kind()`, the parser calls `self.eat(&token::OpenDelim(token::Paren));` before returning `ast::MetaItemKind::Word` just to add `(` to expected token. It seems more natural to eat the paren when parsing `ast::MetaItemKind::List`.
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This PR adds a small refactoring:
pub fn parse_meta_item_kind(&mut self) -> PResult<'a, ast::MetaItemKind> { Ok(if self.eat(&token::Eq) { ast::MetaItemKind::NameValue(self.parse_unsuffixed_lit()?) - } else if self.token == token::OpenDelim(token::Paren) { + } else if self.eat(&token::OpenDelim(token::Paren)) { ast::MetaItemKind::List(self.parse_meta_seq()?) } else { - self.eat(&token::OpenDelim(token::Paren)); ast::MetaItemKind::Word }) }in
parse_meta_item_kind(), the parser callsself.eat(&token::OpenDelim(token::Paren));before returningast::MetaItemKind::Wordjust to add(to expected token. It seems more natural to eat the paren when parsingast::MetaItemKind::List.