Sort-of related, I have this setting to honour the escape sequences in my *compile* buffer

```

;;----------------------------------------------------------------------
;; Enable ansi colours in the compile buffer.
;; See https://stackoverflow.com/questions/3072648/cucumbers-ansi-colors-messing-up-emacs-compilation-buffer#3072831
(ignore-errors
(require 'ansi-color)
(defun my-colorize-compilation-buffer ()
(when (eq major-mode 'compilation-mode)
(ansi-color-apply-on-region compilation-filter-start (point-max))))
(add-hook 'compilation-filter-hook 'my-colorize-compilation-buffer))

```

On Sat, 30 Jul 2022 at 19:54, Henry Laxen <nadine.and.henry@pobox.com> wrote:

Dear Cafe,

Greeting Gentle Haskellers,

I know this may really be a question for the emacs guys, but I thought
for sure someone here has encoutered the same thing and would
recognize the problem right away.

Here is my progam:

module Main where
main = xprint "hi"

Yes, xprint is intensional, I want an error.

I am in haskell mode in emacs. I type C-c C-l running
haskell-process-load-file, and get:

Hours of hacking await!
If I break, you can:
1. Restart: M-x haskell-process-restart
2. Configure logging: C-h v haskell-process-log (useful for debugging)
3. General config: M-x customize-mode
4. Hide these tips: C-h v haskell-process-show-debug-tips
.[;1m/home/henry/a.hs:2:8-13: .[;1m.[31merror:.[0m.[0m.[;1m.[0m.[0m.[;1m …
• Variable not in scope: xprint :: [Char] -> t
• Perhaps you meant ‘print’ (imported from Prelude).[0m.[0m
.[;1m/home/henry/a.hs:2:8-13: .[;1m.[31merror:.[0m.[0m.[;1m.[0m.[0m.[;1m …
• Variable not in scope: xprint :: [Char] -> t
• Perhaps you meant ‘print’ (imported from Prelude).[0m.[0m
Compilation failed.

but when I swich to the *haskell* buffer and type :r, I get the
beautiful, colorized message:

[1 of 1] Compiling Main ( /home/henry/a.hs, interpreted )

/home/henry/a.hs:2:8-13: error:
• Variable not in scope: xprint :: [Char] -> t
• Perhaps you meant ‘print’ (imported from Prelude)
|
2 | main = xprint "hi"
| ^^^^^^
Failed, no modules loaded.

Where the escape sequences have been interpreted correctly. What do I
have misconfigured? Please point me in a direction. Thanks in
advance.

Best wishes,
Henry Laxen

--
Nadine and Henry Laxen The rest is silence
Gral. Manuel Márquez de León 1301
Onix #2302
Zona Urban Rio Never try to teach a pig to sing;
Tijuana It wastes your time
+52 (333) 667-8633 And it annoys the pig
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