+(defmacro secured-eval (form &optional output-stream)
+ `(let ((error-handler #'si::universal-error-handler)
+ (result-eval))
+ (defun si::universal-error-handler (error-name correctable function-name continue-format-string error-format-string &rest args)
+ ,(when output-stream `(format ,output-stream error-format-string)))
+ (setq result-eval (eval ,form))
+ (setf (symbol-function 'si::universal-error-handler) error-handler)
+ result-eval))
+