Something went wrong with my previous email. Sorry. I try again. Hi. First of all congratulations with version 6.0. Very mice indeed. The streams as provided by racket/stream are very nice and much simpler than in srfi 41. two remarks though. one. racket/stream duplicates code as found in racket/promise too. This is necesssary, of course, for otherwise we could not discern streams from promises. It would be nice if racket/promise would provide a tool for the definition of subtypes of promises. Such a tool would have to define (at least) a predicate (procedure) and two constructors (syntaxes), one for lazy and one for delay. two I miss something that I call stream-lazy. When using racket/stream, I define: (define-syntax-rule (stream-lazy def/expr ...) (stream-cdr (stream-cons 'who-cares? (let () def/expr ...)))) When using srfi 41, I define: (define-syntax-rule (stream-lazy def/expr ...) ((stream-lambda () def/expr ...))) Just my two cents. Jos
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