why am I getting bytecode diff output?

[dimaqq]

installed in 2.7 virtualenv, ran against and svn change like so:
pydiff somecheckout/.svn/pristine/1b/1bdxxx.svn-base somecheckout/path/somefile.py

got diff like this:

@@ -6730,7 +6730,7 @@
                               'STOP_CODE',
                               'POP_TOP',
                               'JUMP_FORWARD',
-                              'BREAK_LOOP',
+                              'YIELD_VALUE',
                               'STOP_CODE',
                               'LOAD_FAST',
                               '<6>',

[4 more similar blocks snipped]

the actual change was in this form:

-    somecall(foo(value))
+    tmp = foo(value)
+    somecall(tmp)

[dimaqq]

oh I see it's by design...

I suppose I expected to see these changes annotated by source code line or something....

feel free to close.