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: byte_handlers.rs
    path of file: ./repos/oxc/crates/oxc_parser/src/lexer
    
    the code of the file until where you have to start completion: use super::{Kind, Lexer};
use crate::diagnostics;

#[allow(clippy::unnecessary_safety_comment)]
/// Handle next byte of source.
///
/// SAFETY:
/// * Lexer must not be at end of file.
/// * `byte` must be next byte of source code, corresponding to current position o
    
///   fn SPS(lexer: &mut Lexer) {
///     // SAFETY: This macro is only used for ASCII characters
///     unsafe {
///       use assert_unchecked::assert_unchecked;
///       let s = lexer.current.chars.as_str();
///       assert_unchecked!(!lexer.source.is_eof());
///       assert_unchecked!(lexer.source.peek_byte_unchecked() < 128);
///     }
///     {
///       lexer.consume_char();
///       Kind::WhiteSpace
///     }
///   }