Method is_spec_bool

cranelift/isle/isle/src/parser.rs:132–137

(&self)

    }

    fn is_spec_bool(&self) -> bool {
        self.is(|tok| match tok {
            Token::Symbol(tok_s) if tok_s == "true" || tok_s == "false" => true,
            _ => false,
        })
    }

    fn expect_lparen(&mut self) -> Result<()> {
        self.expect(|tok| *tok == Token::LParen).map(|_| ())