[issue4857] syntax: no unpacking in augassign

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Extract of the grammar:
  target          ::=  identifier | ...
  target_list     ::=  target ("," target)* [","]
  assignment_stmt ::=  (target_list "=")+ ...
  augmented_assignment_stmt ::=  target augop ...
  augop                     ::=  "+=" | ...

So there is only one possible target for "... += ..." and multiple 
targets for "... = ..".

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nosy: +haypo

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4857>
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