250     use crate::parse::discouraged::Speculative as _;
251     use crate::parse::{Parse, ParseStream};
261         fn parse(input: ParseStream) -> Result<Self> {  in parse()  method
263             let _visibility: Visibility = input.parse()?;  in parse()
264             let ident: Ident = input.parse()?;  in parse()
266                 Fields::Named(input.parse()?)  in parse()
268                 Fields::Unnamed(input.parse()?)  in parse()
273                 let eq_token: Token![=] = input.parse()?;  in parse()
275                 let discriminant: Expr = input.parse()?;  in parse()
280                     let mut discriminant: Result<Expr> = ahead.parse();  in parse()
303         fn parse(input: ParseStream) -> Result<Self> {  in parse()  method
314         fn parse(input: ParseStream) -> Result<Self> {  in parse()  method
328             let vis: Visibility = input.parse()?;  in parse_named()
334                 input.parse()  in parse_named()
337             let colon_token: Token![:] = input.parse()?;  in parse_named()
345                 input.parse::<FieldsNamed>()?;  in parse_named()
348                 input.parse()?  in parse_named()
366                 vis: input.parse()?,  in parse_unnamed()
370                 ty: input.parse()?,  in parse_unnamed()