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Re: SRFI 29 doesn't allow for reordering

This page is part of the web mail archives of SRFI 29 from before July 7th, 2015. The new archives for SRFI 29 contain all messages, not just those from before July 7th, 2015.

Scott G. Miller wrote:
Why, though, is the escape code format so complicated?

Because we want to be compatible with existing implementations.

Surely something simpler could be imagined, ~r<n> for example, which when immediately preceding a value-requiring escape code requests that it retrieve the <n>'th argument.

That doesn't work if the value-requiring escade code can take a
parameter, which in Common Lisp (and existing Scheme implementations)
is almost all of them.

In any case, I don't think "~rNa" is enough of an improvement
over "~N@*~a" to justifying inventing a new convention.  Yes,
it might have been better if Common Lisp made '@' ("absolute
goto") the default, but they didn't.
	--Per Bothner
per@xxxxxxxxxxx   http://www.bothner.com/per/