Import Upstream version 2a6upstream/2a6

1 files changed, 54 insertions, 0 deletions

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+;;;"macrotst.scm" Test for R4RS Macros
+;;; From Revised^4 Report on the Algorithmic Language Scheme
+;;; Editors: William Clinger and Jonathon Rees
+;
+; We intend this report to belong to the entire Scheme community, and so
+; we grant permission to copy it in whole or in part without fee.  In
+; particular, we encourage implementors of Scheme to use this report as
+; a starting point for manuals and other documentation, modifying it as
+; necessary.
+
+;;; To run this code type
+;;; (require 'macro)
+;;; (macro:load "macrotst.scm")
+
+(write "this code should print now, outer, and 7") (newline)
+
+(write
+ (let-syntax ((when (syntax-rules ()
+				  ((when test stmt1 stmt2 ...)
+				   (if test
+				       (begin stmt1
+					      stmt2 ...))))))
+   (let ((if #t))
+     (when if (set! if 'now))
+     if)))
+(newline)
+;;;			==> now
+
+(write
+ (let ((x 'outer))
+   (let-syntax ((m (syntax-rules () ((m) x))))
+     (let ((x 'inner))
+       (m)))))
+(newline)
+;;;			==> outer
+(write
+ (letrec-syntax
+  ((or (syntax-rules ()
+	 ((or) #f)
+	 ((or e) e)
+	 ((or e1 e2 ...)
+	  (let ((temp e1))
+	    (if temp temp (or e2 ...)))))))
+  (let ((x #f)
+	(y 7)
+	(temp 8)
+	(let odd?)
+	(if even?))
+    (or x
+	(let temp)
+	(if y)
+	y))))
+(newline)
+;;;			==> 7