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: puncttable.rs
    path of file: ./repos/pulldown-cmark/pulldown-cmark/src
    
    the code of the file until where you have to start completion: // Copyright 2015 Google Inc. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the 
    
pub(crate) fn is_punctuation(c: char) -> bool {
    let cp = c as u32;
    if cp < 128 {
        return is_ascii_punctuation(cp as u8);
    }
    if cp > 0x1FBCA {
        return false;
    }
    let high = (cp / 16) as u16;
    match PUNCT_TAB.binary_search(&high) {
        Ok(index) => (PUNCT_MASKS[index] & (1 << (cp & 15))) != 0,
        _ => false,
    }
}