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Re: [r6rs-discuss] [Scheme-reports] Scheme pattern matching: the case for (case)
On Wed, 22 Dec 2010, Peter Kourzanov wrote:
> On Wed, 2010-12-22 at 15:55 -0500, Andre van Tonder wrote:
>> R5RS chapter 6 intro:
>> A program may use a top-level definition to bind any variable. It may
>> subsequently alter any such binding by an assignment (see 4.1.6). These
>> operations DO NOT MODIFY the behavior of Scheme's built-in procedures.
> But, in R6RS they are in the base library and no longer built-in.
It doesn't matter:
All explicitly exported variables are immutable in both the exporting and
importing libraries. It is thus a syntax violation if an explicitly exported
variable appears on the left-hand side of a set! expression, either in the
exporting or importing libraries.
A <top-level body> is like a <library body> (see section 7.1), except that
definitions and expressions may occur in any order.
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