From: Chris Hanson <org/chris-hanson/cph>
Date: Thu, 25 Feb 1999 18:23:55 +0000 (+0000)
Subject: Guarantee that port-type specifies standard operations.
X-Git-Tag: 20090517-FFI~4598
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=cf059a14f4b2cc07d255947db84865e1764e3ce2;p=mit-scheme.git

Guarantee that port-type specifies standard operations.
---

diff --git a/v7/src/runtime/port.scm b/v7/src/runtime/port.scm
index 4acce0dc8..fd1e31430 100644
--- a/v7/src/runtime/port.scm
+++ b/v7/src/runtime/port.scm
@@ -1,6 +1,6 @@
 #| -*-Scheme-*-
 
-$Id: port.scm,v 1.18 1999/02/25 18:23:06 cph Exp $
+$Id: port.scm,v 1.19 1999/02/25 18:23:55 cph Exp $
 
 Copyright (c) 1991-1999 Massachusetts Institute of Technology
 
@@ -396,7 +396,8 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 	     (or (assq 'WRITE-CHAR operations)
 		 (assq 'WRITE-SUBSTRING operations))))
 	(if (not (or input? output?))
-	    (error "No standard operations specified:" operations))
+	    (error "Port type must implement one of the following operations:"
+		   '(READ-CHAR WRITE-CHAR WRITE-SUBSTRING)))
 	(install-operations! type input?
 			     input-operation-names
 			     input-operation-modifiers