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+; "eval.scm", Eval proposed by Guillermo (Bill) J. Rozas for R5RS.
+; Copyright (c) 1997, 1998 Aubrey Jaffer
+;
+;Permission to copy this software, to redistribute it, and to use it
+;for any purpose is granted, subject to the following restrictions and
+;understandings.
+;
+;1.  Any copy made of this software must include this copyright notice
+;in full.
+;
+;2.  I have made no warrantee or representation that the operation of
+;this software will be error-free, and I am under no obligation to
+;provide any services, by way of maintenance, update, or otherwise.
+;
+;3.  In conjunction with products arising from the use of this
+;material, there shall be no use of my name in any advertising,
+;promotional, or sales literature without prior written consent in
+;each case.
+
+;;; Rather than worry over the status of all the optional procedures,
+;;; just require as many as possible.
+
+(require 'rev4-optional-procedures)
+(require 'dynamic-wind)
+(require 'transcript)
+(require 'with-file)
+(require 'values)
+
+(define eval:make-environment
+  (let ((eval-1 slib:eval))
+    (lambda (identifiers)
+      ((lambda args args)
+       #f
+       identifiers
+       (lambda (expression)
+	 (eval-1 `(lambda ,identifiers ,expression)))))))
+
+(define eval:capture-environment!
+  (let ((set-car! set-car!)
+	(eval-1 slib:eval)
+	(apply apply))
+    (lambda (environment)
+      (set-car!
+       environment
+       (apply (lambda (environment-values identifiers procedure)
+		(eval-1 `((lambda args args) ,@identifiers)))
+	      environment)))))
+
+(define interaction-environment
+  (let ((env (eval:make-environment '())))
+    (lambda () env)))
+
+;;; null-environment is set by first call to scheme-report-environment at
+;;; the end of this file.
+(define null-environment #f)
+
+(define scheme-report-environment
+  (let* ((r4rs-procedures
+	  (append
+	   (cond ((provided? 'inexact)
+		  (append
+		   '(acos angle asin atan cos exact->inexact exp
+			  expt imag-part inexact->exact log magnitude
+			  make-polar make-rectangular real-part sin
+			  sqrt tan)
+		   (if (let ((n (string->number "1/3")))
+			 (and (number? n) (exact? n)))
+		       '(denominator numerator)
+		       '())))
+		 (else '()))
+	   (cond ((provided? 'rationalize)
+		  '(rationalize))
+		 (else '()))
+	   (cond ((provided? 'delay)
+		  '(force))
+		 (else '()))
+	   (cond ((provided? 'char-ready?)
+		  '(char-ready?))
+		 (else '()))
+	   '(* + - / < <= = > >= abs append apply assoc assq assv boolean?
+	       caaaar caaadr caaar caadar caaddr caadr caar cadaar cadadr cadar
+	       caddar cadddr caddr cadr call-with-current-continuation
+	       call-with-input-file call-with-output-file car cdaaar cdaadr
+	       cdaar cdadar cdaddr cdadr cdar cddaar cddadr cddar cdddar cddddr
+	       cdddr cddr cdr ceiling char->integer char-alphabetic?  char-ci<=?
+	       char-ci<?  char-ci=?  char-ci>=?  char-ci>?  char-downcase
+	       char-lower-case?  char-numeric?  char-upcase char-upper-case?
+	       char-whitespace?  char<=?  char<?  char=?  char>=?  char>?  char?
+	       close-input-port close-output-port complex?  cons
+	       current-input-port current-output-port display eof-object?  eq?
+	       equal?  eqv?  even?  exact?  floor for-each gcd inexact?
+	       input-port?  integer->char integer?  lcm length list list->string
+	       list->vector list-ref list-tail list?  load make-string
+	       make-vector map max member memq memv min modulo negative?
+	       newline not null?  number->string number?  odd?  open-input-file
+	       open-output-file output-port?  pair?  peek-char positive?
+	       procedure?  quotient rational?  read read-char real?  remainder
+	       reverse round set-car!  set-cdr!  string string->list
+	       string->number string->symbol string-append string-ci<=?
+	       string-ci<?  string-ci=?  string-ci>=?  string-ci>?  string-copy
+	       string-fill!  string-length string-ref string-set!  string<=?
+	       string<?  string=?  string>=?  string>?  string?  substring
+	       symbol->string symbol?  transcript-off transcript-on truncate
+	       vector vector->list vector-fill!  vector-length vector-ref
+	       vector-set!  vector?  with-input-from-file with-output-to-file
+	       write write-char zero?
+	       )))
+	 (r5rs-procedures
+	  (append
+	   '(call-with-values dynamic-wind eval interaction-environment
+			      null-environment scheme-report-environment values)
+	   r4rs-procedures))
+	 (r4rs-environment (eval:make-environment r4rs-procedures))
+	 (r5rs-environment (eval:make-environment r4rs-procedures)))
+    (let ((car car))
+      (lambda (version)
+	(cond ((car r5rs-environment))
+	      (else
+	       (let ((null-env (eval:make-environment r5rs-procedures)))
+		 (set-car! null-env (map (lambda (i) #f) r5rs-procedures))
+		 (set! null-environment (lambda version null-env)))
+	       (eval:capture-environment! r4rs-environment)
+	       (eval:capture-environment! r5rs-environment)))
+	(case version
+	  ((4) r4rs-environment)
+	  ((5) r5rs-environment)
+	  (else (slib:error 'eval 'version version 'not 'available)))))))
+
+(define eval
+  (let ((eval-1 slib:eval)
+	(apply apply)
+	(null? null?)
+	(eq? eq?))
+    (lambda (expression . environment)
+      (if (null? environment) (eval-1 expression)
+	  (apply
+	   (lambda (environment)
+	     (if (eq? (interaction-environment) environment) (eval-1 expression)
+		 (apply (lambda (environment-values identifiers procedure)
+			  (apply (procedure expression) environment-values))
+			environment)))
+	   environment)))))
+(set! slib:eval eval)
+
+;;; Now that all the R5RS procedures are defined, capture r5rs-environment.
+(and (scheme-report-environment 5) #t)