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bug#11198: problems reading data with a "read-hash-extend" registered re

From: Noah Lavine
Subject: bug#11198: problems reading data with a "read-hash-extend" registered reader
Date: Tue, 24 Apr 2012 07:38:17 -0400

And just a quick note - this problem is more general than record
types. If someone added a type through C and wanted it to have a read
syntax, the same issue would apply. I can imagine times when this
would be very useful - for instance, you have a C extension to Guile,
and you want to be able to send data between your different Guile
instances in a way that is easy to manually inspect. You need a reader
and a serializer for your C things.


On Tue, Apr 24, 2012 at 7:24 AM, Noah Lavine <address@hidden> wrote:
> Hello,
>>> I think the reader should only return valid Scheme objects that have a
>>> read syntax (info "(r5rs) Lexical Structure"), and records are not among
>>> them.
>> I agree, FWIW.
> This seems like circular logic to me - extending the reader should
> mean that new types can have read syntax. The problem here, I think,
> is that the compiler also needs to know how to serialize those types.
> Why don't we provide an interface to define a serializer as well as a
> reader, and have compile-assembly use these serializers? As long as
> each type has both a serializer and a reader, it should work fine.
> That also feels symmetrical, which I take as a good sign. :-)
> Noah

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