Method parse_optional_range_end

crates/hll-to-ir/src/parser.rs:1009–1015

A range end is omitted when the next token closes the subscript (`..]`).

(&mut self)

    // so `flags & MASK == 0` is `(flags & MASK) == 0`.
    fn parse_bitwise_or(&mut self) -> Result<Expression, ParserError> {
        let mut expr = self.parse_bitwise_xor()?;
        while self.match_bitwise_or() {
            self.consume_terminators();
            let right = self.parse_bitwise_xor()?;
            expr = Expression::Binary {
                op: BinaryOp::BitwiseOr,
                left: Box::new(expr),
                right: Box::new(right),
            };
        }