Parsing generics in both trait items and impl items
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804b15be82
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19e25b61d1
1 changed files with 36 additions and 3 deletions
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@ -1293,9 +1293,10 @@ impl<'a> Parser<'a> {
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let lo = self.span;
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let (name, node, generics) = if self.eat_keyword(keywords::Type) {
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let TyParam {ident, bounds, default, ..} = self.parse_ty_param(vec![])?;
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let (generics, TyParam {ident, bounds, default, ..}) =
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self.parse_trait_item_assoc_ty(vec![])?;
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self.expect(&token::Semi)?;
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(ident, TraitItemKind::Type(bounds, default), ast::Generics::default())
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(ident, TraitItemKind::Type(bounds, default), generics)
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} else if self.is_const_item() {
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self.expect_keyword(keywords::Const)?;
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let ident = self.parse_ident()?;
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@ -4442,6 +4443,36 @@ impl<'a> Parser<'a> {
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})
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}
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fn parse_trait_item_assoc_ty(&mut self, preceding_attrs: Vec<Attribute>)
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-> PResult<'a, (Generics, TyParam)> {
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let span = self.span;
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let ident = self.parse_ident()?;
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let mut generics = self.parse_generics()?;
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// Parse optional colon and param bounds.
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let bounds = if self.eat(&token::Colon) {
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self.parse_ty_param_bounds()?
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} else {
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Vec::new()
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};
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let default = if self.eat(&token::Eq) {
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Some(self.parse_ty()?)
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} else {
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None
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};
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generics.where_clause = self.parse_where_clause()?;
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Ok((Generics, TyParam {
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attrs: preceding_attrs.into(),
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ident,
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id: ast::DUMMY_NODE_ID,
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bounds,
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default,
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span,
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}))
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}
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/// Parses (possibly empty) list of lifetime and type parameters, possibly including
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/// trailing comma and erroneous trailing attributes.
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pub fn parse_generic_params(&mut self) -> PResult<'a, (Vec<LifetimeDef>, Vec<TyParam>)> {
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@ -4984,10 +5015,12 @@ impl<'a> Parser<'a> {
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let defaultness = self.parse_defaultness()?;
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let (name, node, generics) = if self.eat_keyword(keywords::Type) {
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let name = self.parse_ident()?;
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let mut generics = self.parse_generics()?;
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self.expect(&token::Eq)?;
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let typ = self.parse_ty()?;
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generics.where_clause = self.parse_where_clause()?;
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self.expect(&token::Semi)?;
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(name, ast::ImplItemKind::Type(typ), ast::Generics::default())
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(name, ast::ImplItemKind::Type(typ), generics)
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} else if self.is_const_item() {
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self.expect_keyword(keywords::Const)?;
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let name = self.parse_ident()?;
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