Function nu_parser::parse_math_expression

pub fn parse_math_expression(
    incoming_idx: usize, 
    lite_args: &[Spanned<String>], 
    scope: &dyn ParserScope, 
    shorthand_mode: bool
) -> (usize, SpannedExpression, Option<ParseError>)

Handle parsing math expressions, complete with working with the precedence of the operators