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: util.rs
    path of file: ./repos/zed/crates/util/src
    
    the code of the file until where you have to start completion: pub mod arc_cow;
pub mod fs;
pub mod github;
pub mod http;
pub mod paths;
mod semantic_version;
#[cfg(any(test, feature = "test-support"))]
pub mod test;

pub use backtrace::Backtrace;
use futures::Future;
use lazy_static::lazy_static;
use rand::{seq::SliceRandom, Rng};
pub 
    
    pub fn from_numeric_prefixed_str(str: &'a str) -> Option<Self> {
        let mut chars = str.chars();
        let prefix: String = chars.by_ref().take_while(|c| c.is_ascii_digit()).collect();
        let remainder = chars.as_str();

        match prefix.parse::<i32>() {
            Ok(prefix) => Some(NumericPrefixWithSuffix(prefix, remainder)),
            Err(_) => None,
        }
    }