From b82d1a47cfc84a632a2afe031764d35fa9ff95f7 Mon Sep 17 00:00:00 2001
From: Jan Malakhovski <oxij@oxij.org>
Date: Sun, 27 Dec 2015 14:47:55 +0000
Subject: [PATCH] ob-calc: Don't leave garbage on the stack

* lisp/ob-calc.el (org-babel-calc-eval-string): Clean up the stack after
  expression evaluation.
---
 lisp/ob-calc.el | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lisp/ob-calc.el b/lisp/ob-calc.el
index a8c50da93..99d0a09b2 100644
--- a/lisp/ob-calc.el
+++ b/lisp/ob-calc.el
@@ -89,7 +89,9 @@
 	     (split-string (org-babel-expand-body:calc body params) "[\n\r]"))))
   (save-excursion
     (with-current-buffer (get-buffer "*Calculator*")
-      (calc-eval (calc-top 1)))))
+      (prog1
+        (calc-eval (calc-top 1))
+        (calc-pop 1)))))
 
 (defun org-babel-calc-maybe-resolve-var (el)
   (if (consp el)