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RE: [External] : PATCH: Explicitly show how let works on global-variable

From: Drew Adams
Subject: RE: [External] : PATCH: Explicitly show how let works on global-variables
Date: Tue, 4 Oct 2022 15:00:54 +0000

This isn't quite correct:

     When you use a system-wide variable in
     @code{let}, its value is modified in its
     scope and then restored.

1. I'm guessing that by "system-wide" (which is not
   defined) you mean a "special", i.e., "dynamic" var.

2. Dynamic binding has no notion of scope, actually.
   It's instead about duration: the binding has dynamic
   _extent_: it remains in effect until the `let' is

See CLTL2, section "Scope and Extent": 

("The term 'dynamic scope' is a misnomer. Nevertheless
it is both traditional and useful.")

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