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diff --git a/src/geiser/utils.scm b/src/geiser/utils.scm
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+;;; utils.scm -- utility functions
+
+;; Copyright (C) 2009, 2010, 2011 Jose Antonio Ortega Ruiz
+
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the Modified BSD License. You should
+;; have received a copy of the license along with this program. If
+;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
+
+;; Start date: Mon Mar 02, 2009 01:48
+
+(define-module (geiser utils)
+  #:export (make-location
+            symbol->object
+            pair->list
+            sort-symbols!
+            make-symbol-sort
+            gensym?)
+  #:use-module (ice-9 regex))
+
+(define (symbol->object sym)
+  (and (symbol? sym)
+       (module-defined? (current-module) sym)
+       (module-ref (current-module) sym)))
+
+(define (pair->list pair)
+  (let loop ((d pair) (s '()))
+    (cond ((null? d) (reverse! s))
+          ((symbol? d) (reverse! (cons d s)))
+          (else (loop (cdr d) (cons (car d) s))))))
+
+(define (make-location file line)
+  (list (cons "file" (if (string? file) file '()))
+        (cons "line" (if (number? line) (+ 1 line) '()))))
+
+(define (sort-symbols! syms)
+  (let ((cmp (lambda (l r)
+               (string<? (symbol->string l) (symbol->string r)))))
+    (sort! syms cmp)))
+
+(define (make-symbol-sort sel)
+  (let ((cmp (lambda (a b)
+               (string<? (symbol->string (sel a))
+                         (symbol->string (sel b))))))
+    (lambda (syms)
+      (sort! syms cmp))))
+
+(define (gensym? sym)
+  (and (symbol? sym) (gensym-name? (format #f "~A" sym))))
+
+(define (gensym-name? name)
+  (and (string-match "^#[{]" name) #t))