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: input.rs
    path of file: ./repos/swc/crates/swc_common/src
    
    the code of the file until where you have to start completion: use std::str;

use debug_unreachable::debug_unreachable;

use crate::syntax_pos::{BytePos, SourceFile};

pub type SourceFileInput<'a> = StringInput<'a>;

/// Implementation of [Input].
#[derive(Clone)]
pub struct StringInput<'a> {
    start_pos_of_iter: BytePos,
    last_pos: BytePos,
    /// Current cursor
    iter: str::CharIndices<'a>,
    orig: &'a str,
    /// Original start position.
    orig_start: BytePos,
}

impl<'a> StringInput<'a> {
    /// `start` and `end` can be arbitrary value, but start should be less than
    /// or equal to end.
    ///
    ///
    /// `swc` get this value from [SourceMap] because code generator depends on
    /// some methods of [SourceMap].
    /// If you are not going to use methods from
    /// [SourceMap], you
    
    //    fn src_input_smoke_02() {
    //        let _ = crate::with_test_sess("℘℘/℘℘", | mut i| {
    //            assert_eq!(i.iter.as_str(), "℘℘/℘℘");
    //            assert_eq!(i.cur_pos(), BytePos(0));
    //            assert_eq!(i.last_pos, BytePos(0));
    //            assert_eq!(i.start_pos, BytePos(0));
    //            assert_eq!(i.uncons_while(|c| c.is_ident_part()), "℘℘");
    //
    //            assert_eq!(i.iter.as_str(), "/℘℘");
    //            assert_eq!(i.last_pos, BytePos(6));
    //            assert_eq!(i.start_pos, BytePos(6));
    //            assert_eq!(i.cur(), Some('/'));
    //            i.bump();
    //            assert_eq!(i.last_pos, BytePos(7));
    //            assert_eq!(i.start_pos, BytePos(6));
    //
    //            assert_eq!(i.iter.as_str(), "℘℘");
    //            assert_eq!(i.uncons_while(|c| c.is_ident_part()), "℘℘");
    //            assert_eq!(i.last_pos, BytePos(13));
    //            assert_eq!(i.start_pos, BytePos(13));
    //
    //            Ok(())
    //        });
    //    }