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----- Original Message ----- From: Richard Kelsey <kelsey@xxxxxxxxxxxxxxxxxxx> To: <srfi-10@xxxxxxxxxxxxxxxxx> Sent: Thursday, September 30, 1999 11:05 AM Subject: a counter proposal > ... > Why not have > > #,(...) > > read as > > (force (delay (...))) > > just as `(...) reads as (quasiquote ...)? This avoids the need to > preregister constructors and it preserves the separation between > syntax and semantics. A program can be evaluated in one fell swoop. I woud only suggest to read #,(...) as (hash-comma ...) and (define-syntax hash-comma (syntax-rules () ((_ ?x) (force (delay ?x)))). This would expose only one name to name capture -related hazards of read-macro expansion. It's a pity that this form won't work inside quoted constants, though... Sergei