Le 2012-11-14 à 4:22 PM, John Cowan <cowan@x> a écrit :
R7RS defines mutation of imported variables as "an error". This looks like a restriction to me and goes against the Scheme mantra "Programming languages should be designed not by piling feature on top of feature, but by removing the weaknesses and restrictions...".
> Marc Feeley scripsit:
>> Let me say that I find it contrary to the spririt of Scheme to prevent
>> redefinition and assignment of exported variables. It is something
>> Schemers do all the time.
> Please note that R7RS, unlike R6RS, does not outright forbid redefinition
> of imported (as opposed to exported) variables; it simply excludes such
> actions from the purview of the standard.
Scheme has had mutation since the beginning. All variables are mutable. No exceptions. Now R7RS is adding a restriction on variables (mutation in not allowed on imported variables). This is incoherent with the Scheme mantra.
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