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Augmented assignment is currently all of these:
augassign: ('+=' | '-=' | '\*=' | '@=' | '/=' | '%=' | '&=' | '|=' | '^=' |
'<<=' | '>>=' | '\*\*=' | '//=')
I'm actually not sure whether the augmented-assignment-expression
operators should be "+:=" or ":+=", but either way, it'd be another
thirteen tokens, some of which would be \*four\* character tokens.
Or simply rework the augmented assignment's semantics to become expression operators without any syntactic changes. Since there's no bug magnet arising in the usual context where '=' and '==' get confused:
> if x += 1 < 2: