Index: example.py
===================================================================
--- example.py	(Revision 53078)
+++ example.py	(Arbeitskopie)
@@ -65,6 +65,27 @@
     apply(f, args=args, kwds=kwds)
     apply(f, args, kwds=kwds)
 
+def intern_examples():
+    #
+    # These should be refactored:
+    #
+    x = intern(a)
+    #
+    y = intern("b" # test
+              )
+    #
+    z = intern(a+b+c.d,)
+    #
+    # These not:
+    #
+    intern(a=1)
+    #
+    intern(f, g)
+    #
+    intern(*h)
+    #
+    intern(**i)
+
 def print_examples():
     # plain vanilla
     print 1, 1+1, 1+1+1
Index: fixes/fix_intern.py
===================================================================
--- fixes/fix_intern.py	(Revision 0)
+++ fixes/fix_intern.py	(Revision 0)
@@ -0,0 +1,59 @@
+# Copyright 2006 Georg Brandl.
+# Licensed to PSF under a Contributor Agreement.
+
+"""Fixer for intern()."""
+
+# Python imports
+import token
+
+# Local imports
+import pytree
+import patcomp
+import pygram
+
+syms = pygram.python_symbols
+pat_compile = patcomp.PatternCompiler().compile_pattern
+
+PATTERN = """
+power< 'intern' trailer< lpar='('
+                         obj=arglist< any ',' >
+                         rpar=')' > >
+|
+power< 'intern' trailer< lpar='('
+                         (not arglist)
+                         (not argument<NAME '=' value=any>)
+                         obj=any
+                         rpar=')' > >
+"""
+
+
+class FixIntern(object):
+
+    def __init__(self, options):
+        self.options = options
+        self.pattern = pat_compile(PATTERN)
+
+    def match(self, node):
+        results = {}
+        return self.pattern.match(node, results) and results
+
+    def transform(self, node):
+        results = self.match(node)
+        assert results
+        obj = results["obj"].clone()
+        if obj.type == syms.arglist:
+            newarglist = obj.clone()
+        else:
+            newarglist = pytree.Node(syms.arglist, [obj.clone()])
+        new = pytree.Node(syms.power,
+                          [pytree.Leaf(token.NAME, "sys"),
+                           pytree.Node(syms.trailer,
+                                       [pytree.Leaf(token.DOT, "."),
+                                        pytree.Leaf(token.NAME, "intern")]),
+                           pytree.Node(syms.trailer,
+                                       [results["lpar"].clone(),
+                                        newarglist,
+                                        results["rpar"].clone()])])
+        new.set_prefix(node.get_prefix())
+        return new
+