143         pub rename: Option<(Token![as], Ident)>,
164         pub unsafety: Option<Token![unsafe]>,
177         pub defaultness: Option<Token![default]>,
178         pub unsafety: Option<Token![unsafe]>,
182         pub trait_: Option<(Option<Token![!]>, Path, Token![for])>,
196         pub ident: Option<Ident>,
198         pub semi_token: Option<Token![;]>,
208         pub unsafety: Option<Token![unsafe]>,
211         pub content: Option<(token::Brace, Vec<Item>)>,
212         pub semi: Option<Token![;]>,
243         pub semi_token: Option<Token![;]>,
253         pub unsafety: Option<Token![unsafe]>,
254         pub auto_token: Option<Token![auto]>,
255         pub restriction: Option<ImplRestriction>,
259         pub colon_token: Option<Token![:]>,
316         pub leading_colon: Option<Token![::]>,
589         pub semi_token: Option<Token![;]>,
649         pub default: Option<(Token![=], Expr)>,
660         pub default: Option<Block>,
661         pub semi_token: Option<Token![;]>,
673         pub colon_token: Option<Token![:]>,
675         pub default: Option<(Token![=], Type)>,
686         pub semi_token: Option<Token![;]>,
742         pub defaultness: Option<Token![default]>,
760         pub defaultness: Option<Token![default]>,
772         pub defaultness: Option<Token![default]>,
788         pub semi_token: Option<Token![;]>,
797         pub constness: Option<Token![const]>,
798         pub asyncness: Option<Token![async]>,
799         pub unsafety: Option<Token![unsafe]>,
800         pub abi: Option<Abi>,
806         pub variadic: Option<Variadic>,
813     pub fn receiver(&self) -> Option<&Receiver> {  in receiver()
845         pub reference: Option<(Token![&], Option<Lifetime>)>,
846         pub mutability: Option<Token![mut]>,
848         pub colon_token: Option<Token![:]>,
854     pub fn lifetime(&self) -> Option<&Lifetime> {  in lifetime()
874         pub pat: Option<(Box<Pat>, Token![:])>,
876         pub comma: Option<Token![,]>,
1034             let value = if let Some(eq_token) = input.parse::<Option<Token![=]>>()? {  in parse_rest_of_item()
1127         defaultness: Option<Token![default]>,
1131         colon_token: Option<Token![:]>,
1133         ty: Option<(Token![=], Type)>,
1158             let defaultness: Option<Token![default]> = match allow_defaultness {  in parse()
1202         ) -> Result<(Option<Token![:]>, Punctuated<TypeParamBound, Token![+]>)> {  in parse_optional_bounds()
1203             let colon_token: Option<Token![:]> = input.parse()?;  in parse_optional_bounds()
1226         fn parse_optional_definition(input: ParseStream) -> Result<Option<(Token![=], Type)>> {  in parse_optional_definition()
1227             let eq_token: Option<Token![=]> = input.parse()?;  in parse_optional_definition()
1243             let ident: Option<Ident> = if input.peek(Token![try]) {  in parse()
1249             let semi_token: Option<Token![;]> = if !delimiter.is_brace() {  in parse()
1328             parse_item_use(input, allow_crate_root_in_path).map(Option::unwrap)  in parse()
1335     ) -> Result<Option<ItemUse>> {  in parse_item_use()
1339         let leading_colon: Option<Token![::]> = input.parse()?;  in parse_item_use()
1362             parse_use_tree(input, allow_crate_root_in_path).map(Option::unwrap)  in parse()
1369     ) -> Result<Option<UseTree>> {  in parse_use_tree()
1415                     allow_crate_root_in_path && content.parse::<Option<Token![::]>>()?.is_some();  in parse_use_tree()
1497         fork.parse::<Option<Token![const]>>().is_ok()  in peek_signature()
1498             && fork.parse::<Option<Token![async]>>().is_ok()  in peek_signature()
1502                 || fork.parse::<Option<Token![unsafe]>>().is_ok())  in peek_signature()
1503             && fork.parse::<Option<Abi>>().is_ok()  in peek_signature()
1511             parse_signature(input, allow_safe).map(Option::unwrap)  in parse()
1515     fn parse_signature(input: ParseStream, allow_safe: bool) -> Result<Option<Signature>> {  in parse_signature()
1516         let constness: Option<Token![const]> = input.parse()?;  in parse_signature()
1517         let asyncness: Option<Token![async]> = input.parse()?;  in parse_signature()
1518         let unsafety: Option<Token![unsafe]> = input.parse()?;  in parse_signature()
1525         let abi: Option<Abi> = input.parse()?;  in parse_signature()
1634             if let Some(dots) = input.parse::<Option<Token![...]>>()? {  in parse_fn_arg_or_variadic()
1657                 let lifetime: Option<Lifetime> = input.parse()?;  in parse()
1662             let mutability: Option<Token![mut]> = input.parse()?;  in parse()
1664             let colon_token: Option<Token![:]> = if reference.is_some() {  in parse()
1699     ) -> Result<(Punctuated<FnArg, Token![,]>, Option<Variadic>)> {  in parse_fn_args()
1707             if let Some(dots) = input.parse::<Option<Token![...]>>()? {  in parse_fn_args()
1771             let unsafety: Option<Token![unsafe]> = input.parse()?;  in parse()
1819             let unsafety: Option<Token![unsafe]> = input.parse()?;  in parse()
1855                 let semi_token: Option<Token![;]> = if has_body {  in parse()
1880                 let unsafety: Option<Token![unsafe]> = input.parse()?;  in parse()
2025             let semi_token: Option<Token![;]> = if mac.delimiter.is_brace() {  in parse()
2196             let unsafety: Option<Token![unsafe]> = input.parse()?;  in parse()
2197             let auto_token: Option<Token![auto]> = input.parse()?;  in parse()
2218         unsafety: Option<Token![unsafe]>,  in parse_rest_of_trait()
2219         auto_token: Option<Token![auto]>,  in parse_rest_of_trait()
2224         let colon_token: Option<Token![:]> = input.parse()?;  in parse_rest_of_trait()
2336             let defaultness: Option<Token![default]> = input.parse()?;  in parse()
2352                     let default = if let Some(eq_token) = input.parse::<Option<Token![=]>>()? {  in parse()
2544             let semi_token: Option<Token![;]> = if mac.delimiter.is_brace() {  in parse()
2561             parse_impl(input, allow_verbatim_impl).map(Option::unwrap)  in parse()
2565     fn parse_impl(input: ParseStream, allow_verbatim_impl: bool) -> Result<Option<ItemImpl>> {  in parse_impl()
2568         let defaultness: Option<Token![default]> = input.parse()?;  in parse_impl()
2569         let unsafety: Option<Token![unsafe]> = input.parse()?;  in parse_impl()
2582             input.parse::<Option<Token![?]>>()?;  in parse_impl()
2698                 let value = if let Some(eq_token) = input.parse::<Option<Token![=]>>()? {  in parse()
2762             let defaultness: Option<Token![default]> = input.parse()?;  in parse()
2798             parse_impl_item_fn(input, allow_omitted_body).map(Option::unwrap)  in parse()
2805     ) -> Result<Option<ImplItemFn>> {  in parse_impl_item_fn()
2808         let defaultness: Option<Token![default]> = input.parse()?;  in parse_impl_item_fn()
2814         if allow_omitted_body && input.parse::<Option<Token![;]>>()?.is_some() {  in parse_impl_item_fn()
2840             let defaultness: Option<Token![default]> = input.parse()?;  in parse()
2902             let semi_token: Option<Token![;]> = if mac.delimiter.is_brace() {  in parse()
2927             let mut_token: Option<Token![mut]> = input.parse()?;  in parse()