Author: Tobias Pape <tob...@netshed.de>
Branch:
Changeset: r70325:33a9aeb0b05e
Date: 2014-03-29 12:47 +0100
http://bitbucket.org/pypy/pypy/changeset/33a9aeb0b05e/
Log: Be a bit more narrative about what can create a closure
diff --git a/rpython/flowspace/objspace.py b/rpython/flowspace/objspace.py
--- a/rpython/flowspace/objspace.py
+++ b/rpython/flowspace/objspace.py
@@ -16,7 +16,13 @@
if func.func_doc and func.func_doc.lstrip().startswith('NOT_RPYTHON'):
raise ValueError("%r is tagged as NOT_RPYTHON" % (func,))
if func.func_code.co_cellvars:
- raise ValueError("RPython functions cannot create closures")
+ raise ValueError(
+"""RPython functions cannot create closures
+Possible casues:
+ Function is inner function
+ Function uses generator expressions
+ Lambda expressions
+""")
if not (func.func_code.co_flags & CO_NEWLOCALS):
raise ValueError("The code object for a RPython function should have "
"the flag CO_NEWLOCALS set.")
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