You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: math.rs
    path of file: ./repos/fish-shell/src/builtins
    
    the code of the file until where you have to start completion: use super::prelude::*;
use crate::tinyexpr::te_interp;

/// The maximum number of points after the decimal that we'll
    
pub fn math(parser: &Parser, streams: &mut IoStreams, argv: &mut [&wstr]) -> Option<c_int> {
    let cmd = argv[0];

    let (opts, mut optind) = match parse_cmd_opts(argv, parser, streams) {
        Ok(x) => x,
        Err(e) => return e,
    };

    if opts.print_help {
        builtin_print_help(parser, streams, cmd);
        return STATUS_CMD_OK;
    }

    let mut expression = WString::new();
    for (arg, _) in Arguments::new(argv, &mut optind, streams, MATH_CHUNK_SIZE) {
        if !expression.is_empty() {
            expression.push(' ')
        }
        expression.push_utfstr(&arg);
    }

    if expression.is_empty() {
        streams
            .err
            .append(wgettext_fmt!(BUILTIN_ERR_MIN_ARG_COUNT1, cmd, 1, 0));
        return STATUS_CMD_ERROR;
    }

    evaluate_expression(cmd, streams, &opts, &expression)
}