Re: [Chicken-users] type extension ("inheritance") and define-record

[John Cowan]

Thomas Chust scripsit:

> It happens simply because some compiler optimizations rely on the
> assumption that a variable is never set! outside the module that defines it.
> 
> It is common practice to adhere to this convention in Scheme programming
> and some dialects of Scheme, for example Racket, even enforce it in general.

Indeed, it is a requirement of R6RS, and R7RS-small will make it an error
(undefined results) to mutate an imported identifier, so Scheme programmers
writing to that standard will not be able to rely on it working.

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