Scheme Reports

Scheme language standardization process

Re: [Scheme-reports] ANN: first draft of R7RS small language available

On Fri, 22 Apr 2011, Alex Shinn wrote:


On Fri, Apr 22, 2011 at 7:46 AM, Andre van Tonder <andre@x> wrote:


Yes, it must be the same binding.  Otherwise nested QUASIQUOTE will break.


If we don't explicitly require that they are the same binding,
and an implementation chooses to _not_ make them the
same binding, then it must come up with some way to make
quasiquote work.  It can choose to use the Chibi/Chicken
approach, or it can use a macro implementation which can
match the nested quasiquote with the actual identifier the
form was expanded from, or it can make quasiquote match
itself unhygienically.


And by the way, if the QUASIQUOTE macro doesn't work portably,
then the MATCH macro examle I had would likely not work either.

And if an implementation of SYNTAX-RULES matches keywords
unhygienically as you suggest in your workarounds, that
implementation would break many currently portable macros
that depend on hygienic matching to work.
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