Method parse_extern

cranelift/isle/isle/src/parser.rs:775–805

(&mut self)

    }

    fn parse_extern(&mut self) -> Result<Extern> {
        let pos = self.pos();
        if self.eat_sym_str("constructor")? {
            let term = self.parse_ident()?;
            let func = self.parse_ident()?;
            Ok(Extern::Constructor { term, func, pos })
        } else if self.eat_sym_str("extractor")? {
            let infallible = self.eat_sym_str("infallible")?;

            let term = self.parse_ident()?;
            let func = self.parse_ident()?;

            Ok(Extern::Extractor {
                term,
                func,
                pos,
                infallible,
            })
        } else if self.eat_sym_str("const")? {
            let pos = self.pos();
            let name = self.parse_const()?;
            let ty = self.parse_ident()?;
            Ok(Extern::Const { name, ty, pos })
        } else {
            Err(self.error(
                pos,
                "Invalid extern: must be (extern constructor ...), (extern extractor ...) or (extern const ...)"
                    .to_string(),
            ))
        }
    }

    fn parse_etor(&mut self) -> Result<Extractor> {
        let pos = self.pos();