Method parse_required_expr

core/src/parser.rs:1013–1019

Wrapper over `parse_expr` that requires an expression to be present and returns an error with `msg` otherwise.

(&mut self, msg: &'static str)

    /// Wrapper over `parse_expr` that requires an expression to be present and returns an error
    /// with `msg` otherwise.
    fn parse_required_expr(&mut self, msg: &'static str) -> Result<Expr> {
        let next_pos = self.lexer.peek()?.pos;
        match self.parse_expr(None)? {
            Some(expr) => Ok(expr),
            None => Err(Error::Bad(next_pos, msg.to_owned())),
        }
    }

    /// Parses a `GOSUB` statement.
    fn parse_gosub(&mut self) -> Result<Statement> {