Scope rule pecularities

[Antoon Pardon]

Op 2004-05-07, Josiah Carlson schreef <jcarlson at uci.edu>:
>> Well I would say that seems to go against the intention as stated
>> in the reference manual. += and associated should attempt the
>> operation in place. If you do an operation in place there is
>> no need to rebind the variable.
>
> Except when the /referenced object/ is immutable.  Name rebinding is 
> necessary to reference the newly created immutable object that was 
> created through the +=, -=, /=, %=, *=, &=, |=, or ^= operations.

IMO having operators that should work in place for object that
are immutable, sound contradictory. Having the following code:

  a = ...
  b = ...
  c = a
  a += b

I now expect a and c still to be the same object.

-- 
Antoon Pardon