[plt-dev] some Racket proposals & implementation

Language-Specific Run-Time Configuration
> ----------------------------------------
>
> Proposal: The main language of a program should determine a run-time
> configuration, including the style for printing values.
> ...
> The different `define-struct's are easily support through different
> bindings imported by `scheme' and `racket'. Similarly, for printing
> top-level results in a module, you might imagine that `scheme' and
> `racket' use different printing functions. The different error formats,
> however, are not so easily controlled through bindings.
>
>    

It seems more elegant to me for error formats to be controlled via 
bindings. What difficulties arise in doing so?

I mean, can't the error functions do something like

(define (error . v)
    (parameterize ([quase-quote #t])
      ...))