;;; This code is in the public domain. ;;; http://srfi.schemers.org/srfi-11/srfi-11.html ;;; by Lars T. Hansen 1999 (define-syntax let-values (syntax-rules () ((let-values (?binding ...) ?body0 ?body1 ...) (let-values "bind" (?binding ...) () (begin ?body0 ?body1 ...))) ((let-values "bind" () ?tmps ?body) (let ?tmps ?body)) ((let-values "bind" ((?b0 ?e0) ?binding ...) ?tmps ?body) (let-values "mktmp" ?b0 ?e0 () (?binding ...) ?tmps ?body)) ((let-values "mktmp" () ?e0 ?args ?bindings ?tmps ?body) (call-with-values (lambda () ?e0) (lambda ?args (let-values "bind" ?bindings ?tmps ?body)))) ((let-values "mktmp" (?a . ?b) ?e0 (?arg ...) ?bindings (?tmp ...) ?body) (let-values "mktmp" ?b ?e0 (?arg ... x) ?bindings (?tmp ... (?a x)) ?body)) ((let-values "mktmp" ?a ?e0 (?arg ...) ?bindings (?tmp ...) ?body) (call-with-values (lambda () ?e0) (lambda (?arg ... . x) (let-values "bind" ?bindings (?tmp ... (?a x)) ?body)))))) (define-syntax let*-values (syntax-rules () ((let*-values () ?body0 ?body1 ...) (begin ?body0 ?body1 ...)) ((let*-values (?binding0 ?binding1 ...) ?body0 ?body1 ...) (let-values (?binding0) (let*-values (?binding1 ...) ?body0 ?body1 ...)))))