Felipe,

I have taken the liberty of reformatting the patch you created for ob-scheme.
You can find it enclosed.

If it is fine with you and the org-mode maintainers it can be applied as-is,
particularly since it is a tiny change.
I have also added some additional information to the commit message, such as
when the `geiser-eval-region/wait' function was introduced.

Please feel free to contact me in regards to any comments or questions you may
have.

Vale,

- Tim Van den Langenbergh

From d06f6d5b7342693b4065c0c361e430c4bdb065e5 Mon Sep 17 00:00:00 2001
From: Tim Van den Langenbergh <tmt_...@gmx.com>
Date: Sat, 23 Apr 2022 14:57:27 +0200
Subject: [PATCH] lisp/ob-scheme.el: Use synchronous eval.

* ob-scheme.el (org-babel-scheme-execute-with-geiser): If available,
use the synchronous `geiser-eval-region/wait' function to get the
evaluation result.

Works with geiser 0.18 (before introduction of async evaluation) and
geiser 0.22 (which introduces `geiser-eval-region/wait').

Modified from a patch proposal by Felipe Lema.

TINYCHANGE
---
 lisp/ob-scheme.el | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lisp/ob-scheme.el b/lisp/ob-scheme.el
index 72d2e029e..f28cadd87 100644
--- a/lisp/ob-scheme.el
+++ b/lisp/ob-scheme.el
@@ -55,6 +55,8 @@
 (declare-function geiser-mode "ext:geiser-mode" ())
 (declare-function geiser-eval-region "ext:geiser-mode"
                   (start end &optional and-go raw nomsg))
+(declare-function geiser-eval-region/wait "ext:geiser-mode"
+                  (start end &optional timeout))
 (declare-function geiser-repl-exit "ext:geiser-repl" (&optional arg))
 (declare-function geiser-eval--retort-output "ext:geiser-eval" (ret))
 (declare-function geiser-eval--retort-result-str "ext:geiser-eval" (ret prefix))
@@ -176,7 +178,11 @@ is true; otherwise returns the last value."
 	  (setq geiser-impl--implementation nil)
 	  (let ((geiser-debug-jump-to-debug-p nil)
 		(geiser-debug-show-debug-p nil))
-	    (let ((ret (geiser-eval-region (point-min) (point-max))))
+	    (let ((ret (funcall (if (fboundp 'geiser-eval-region/wait)
+                                    #'geiser-eval-region/wait
+                                  #'geiser-eval-region)
+                                (point-min)
+                                (point-max))))
 	      (setq result (if output
 			       (or (geiser-eval--retort-output ret)
 				   "Geiser Interpreter produced no output")
--
2.35.3

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