Author: Carl Friedrich Bolz-Tereick <cfb...@gmx.de>
Branch: 
Changeset: r93363:d6474db3c19f
Date: 2017-12-11 14:03 +0100
http://bitbucket.org/pypy/pypy/changeset/d6474db3c19f/

Log:    explain how to do mark_dict_non_null on r_dicts

diff --git a/rpython/rlib/debug.py b/rpython/rlib/debug.py
--- a/rpython/rlib/debug.py
+++ b/rpython/rlib/debug.py
@@ -288,6 +288,9 @@
 def mark_dict_non_null(d):
     """ Mark dictionary as having non-null keys and values. A warning would
     be emitted (not an error!) in case annotation disagrees.
+
+    This doesn't work for r_dicts. For them, pass
+    r_dict(..., force_non_null=True) to the constructor.
     """
     assert isinstance(d, dict)
     return d
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