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-rw-r--r--Lib/sre_compile.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/Lib/sre_compile.py b/Lib/sre_compile.py
index 6b280520b3..5b660844b3 100644
--- a/Lib/sre_compile.py
+++ b/Lib/sre_compile.py
@@ -353,6 +353,7 @@ def _optimize_unicode(charset, fixup):
# Convert byte array to word array
mapping = array.array(code, mapping)
assert mapping.itemsize == _sre.CODESIZE
+ assert len(mapping) * mapping.itemsize == 256
header = header + mapping.tolist()
data[0:0] = header
return [(BIGCHARSET, data)]