SSCCE
based on Haj's example 
use v5.12;
use warnings;

STDOUT->autoflush;
STDERR->autoflush;
STDIN->autoflush;

say "Give me a cookie: ";
my $thing = readline(STDIN);
$thing =~ /^(a )?cookie$/ or warn "That was no cookie.";

say "Thanks and goodbye!";

die "exiting here";

[download]

expected output in pre/tt


Give me a cookie:                                               # waits for input
croock                                                          # manual input             
That was no cookie. at emacs_input.pl line 10, <STDIN> line 1.  # jumps to line 10
Thanks and goodbye!
exiting here at emacs_input.pl line 14, <STDIN> line 1.         # jumps to line 14

For better understanding I manually added meta info

FWIW

I've stumbled over a SO discussion which made this (half) work.

> C-u M-x compile and ... compilation buffer will be in comint mode, i.e. interactive.

(the C-u means prefix arg, a very e-lisp-ish annoyance)

I still have to find a way to make this work inside mode-compile

Cheers Rolf
(addicted to the 𐍀𐌴𐍂𐌻 Programming Language :)
Wikisyntax for the Monastery

In reply to Re: Prompting for input inside IDE (SSCCE) (half SOLVED) by LanX
in thread Prompting for input inside IDE run (was Reading from STDIN) by LanX

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.