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Date: Thu, 27 Apr 2006 12:55:34 -0400 From: John Cowan <cowan@xxxxxxxx> Sebastian Egner scripsit: > One could start with a SRFI for immutable strings as an add-on > library---in the hope that the Scheme community will pick it up > as the primary string type in the distant future. Actually, getting immutable strings into R6RS would be trivial in terms of the document: simply replace the sentence String-set! stores CHAR in element K of STRING and returns an unspecified value. in 6.3.5 with the following: String-set! returns a string whose elements the same (in the sense of eqv?) as those in STRING, with the exception of element K, which is instead the same as CHAR. String-set! may or may not return a string which is the same as STRING, but must not side-effect STRING. (I think you probably meant to strike the exclamation mark from the name.) My alternative string API almost provides this anyway, by the way, under the name STRING-DISPLACE: (STRING-SET string cursor char) <=> (STRING-DISPLACE string cursor (STRING-CURSOR+ cursor string) char).