[falrefaei-debug]

While this invalid line is correctly being removed, the file will still lack a final newline character. It is a widely-followed convention and a POSIX standard to end text files with a newline. This practice prevents issues with version control systems (like git) and other command-line tools. Please consider adding a newline at the end of the file after the closing brace.

Originally posted by @gemini-code-assist in falrefaei-debug/binance-api-postman#1 (comment)

[moonlight-ace]

Since nearcore is written in Rust, the real fix is to update the code that writes the affected file and enforce a trailing newline.

1. Locate the write point

In the repo, search for where that specific file is generated / rewritten (for example):

• Any function that:

  • Reads the file
  • Removes or cleans an “invalid line”
  • Then writes it back to disk

You’re looking for something like (pseudo-style):

fs::write(path, new_contents)?;

or a File::create + write/writeln! combo.

---

2. Enforce a final newline

There are two standard patterns you can use.

Pattern A – When you already have the file as a String

If your code builds the final contents in memory:

use std::fs;

fn rewrite_file_with_trailing_newline(path: &Path, mut contents: String) -> std::io::Result<()> {
    // 1) Do whatever you already do to remove the invalid line
    // remove_invalid_line(&mut contents);

    // 2) Ensure the file ends with exactly one '\n'
    if !contents.ends_with('\n') {
        contents.push('\n');
    }

    // 3) Write it back
    fs::write(path, contents)
}

Key part is:

if !contents.ends_with('\n') {
    contents.push('\n');
}

That guarantees there is a final newline, but doesn’t add double-newlines if it’s already correct.

---

Pattern B – When you use serde_json::to_writer or similar

If you’re writing JSON straight to a File:

use std::fs::File;
use std::io::Write;
use serde_json;

fn write_json_with_trailing_newline<T: serde::Serialize>(
    path: &Path,
    value: &T,
) -> anyhow::Result<()> {
    let mut file = File::create(path)?;
    // Existing logic
    serde_json::to_writer_pretty(&mut file, value)?;
    // Append newline
    file.write_all(b"\n")?;
    Ok(())
}

This is a very common pattern in Rust tooling: generate JSON/YAML/TOML and then manually tack on \n as the last byte.