[plt-dev] `unsafe-fl' and unboxing

From: Dave Herman (dherman at ccs.neu.edu)
Date: Sun Oct 4 18:53:03 EDT 2009

> No! 'identifier?' does not check whether a syntax object represents  
> a variable reference, given 1) identifier macros and 2) #%top  
> transformers for unbound variables. If you really, really want to  
> check if something is a variable reference, 'local-expand' it and  
> look at the result.

Oh, yes, of course. All the more reason to hope mzscheme supports  
MWBoR. (Eli's email suggests it does.)


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