This was fixed back in November, 2022, the result of

https://lists.gnu.org/archive/html/bug-readline/2022-11/msg00002.html

The fix is in the readline devel branch.

## Overview

I believe this is a regression in version 8. When calling readline("") or readline(0), and only hitting Return at the prompt, the final newline is not echoed to the terminal.

Version 7 does echo the newline as expected.

## Example

    /* example.c */
    #include <stdio.h>
    #include <readline/readline.h>

    int main(void) {
        char *line = readline("");
        printf("+ '%s'\n", line);
        return 0;
    }

Output:

    $ example
    + ''
    $

Expected output:

    $ example

    + ''
    $