From: Guillermo J. Rozas <edu/mit/csail/zurich/gjr>
Date: Sat, 14 Oct 1989 15:48:39 +0000 (+0000)
Subject: Fix syntax/cond so that:
X-Git-Tag: 20090517-FFI~11754
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=1086227419cfb0d69c32a4d43babb4f8665c5b80;p=mit-scheme.git

Fix syntax/cond so that:
a: (cond) is legal.
b: (cond 3) gives a reasonable error message.
---

diff --git a/v7/src/runtime/syntax.scm b/v7/src/runtime/syntax.scm
index 7b414d4d6..463f7f186 100644
--- a/v7/src/runtime/syntax.scm
+++ b/v7/src/runtime/syntax.scm
@@ -1,6 +1,6 @@
 #| -*-Scheme-*-
 
-$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/runtime/Attic/syntax.scm,v 14.8 1989/04/18 16:30:11 cph Rel $
+$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/runtime/Attic/syntax.scm,v 14.9 1989/10/14 15:48:39 jinx Exp $
 
 Copyright (c) 1988, 1989 Massachusetts Institute of Technology
 
@@ -319,9 +319,11 @@ MIT in each case. |#
 (define (syntax/or . expressions)
   (expand-disjunction expressions))
 
-(define (syntax/cond clause . rest)
+(define (syntax/cond . clauses)
   (define (loop clause rest)
-    (cond ((eq? (car clause) 'ELSE)
+    (cond ((not (pair? clause))
+	   (syntax-error "Bad COND clause" clause))
+	  ((eq? (car clause) 'ELSE)
 	   (if (not (null? rest))
 	       (syntax-error "ELSE not last clause" rest))
 	   (syntax-sequence (cdr clause)))
@@ -352,7 +354,8 @@ MIT in each case. |#
 	undefined-conditional-branch
 	(loop (car rest) (cdr rest))))
 
-  (loop clause rest))
+  (next clauses))
+
 ;;;; Procedures
 
 (define (syntax/lambda pattern . body)