The opcode YIELD_STMT was accidentally called YIELD_VALUE here.

gvanrossum · gvanrossum · commit 9f709bf9a189 · 2002-06-11T21:17:35.000Z
diff --git a/Lib/dis.py b/Lib/dis.py
@@ -228,7 +228,7 @@ def jabs_op(name, op):
 def_op('RETURN_VALUE', 83)
 def_op('IMPORT_STAR', 84)
 def_op('EXEC_STMT', 85)
-def_op('YIELD_STMT', 86)
+def_op('YIELD_VALUE', 86)
 
 def_op('POP_BLOCK', 87)
 def_op('END_FINALLY', 88)
