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Delay gensym creation for "underscore items" until name resolution

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Prohibit `static _`
Fis unused import warnings for `use foo as _`
Add more tests for `use foo as _`
This commit is contained in:
Vadim Petrochenkov
2018-11-30 22:34:24 +03:00
parent c658d73401
commit 2d4b633be3
16 changed files with 157 additions and 36 deletions
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27
src/libsyntax/parse/parser.rs
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@@ -2017,6 +2017,17 @@ impl<'a> Parser<'a> {
}
}
fn parse_ident_or_underscore(&mut self) -> PResult<'a, ast::Ident> {
match self.token {
token::Ident(ident, false) if ident.name == keywords::Underscore.name() => {
let span = self.span;
self.bump();
Ok(Ident::new(ident.name, span))
}
_ => self.parse_ident(),
}
}
/// Parses qualified path.
/// Assumes that the leading `<` has been parsed already.
///
@@ -6435,13 +6446,7 @@ impl<'a> Parser<'a> {
}
fn parse_item_const(&mut self, m: Option<Mutability>) -> PResult<'a, ItemInfo> {
let id = match self.token {
token::Ident(ident, false) if ident.name == keywords::Underscore.name() => {
self.bump(); // `_`
ident.gensym()
},
_ => self.parse_ident()?,
};
let id = if m.is_none() { self.parse_ident_or_underscore() } else { self.parse_ident() }?;
self.expect(&token::Colon)?;
let ty = self.parse_ty()?;
self.expect(&token::Eq)?;
@@ -7726,13 +7731,7 @@ impl<'a> Parser<'a> {
fn parse_rename(&mut self) -> PResult<'a, Option<Ident>> {
if self.eat_keyword(keywords::As) {
match self.token {
token::Ident(ident, false) if ident.name == keywords::Underscore.name() => {
self.bump(); // `_`
Ok(Some(ident.gensym()))
}
_ => self.parse_ident().map(Some),
}
self.parse_ident_or_underscore().map(Some)
} else {
Ok(None)
}