* boot-9.scm (default-duplicate-binding-handler): Set default to

'(replace warn last)

NEWS

@@ -79,7 +79,7 @@ The new default behavior of the module system when a name collision
 has been detected is to
 
  1. Give priority to bindings marked as a replacement.
- 2. Issue a warning.
+ 2. Issue a warning (different warning if overriding core binding).
  3. Give priority to the last encountered binding (this corresponds to
      the old behavior).
 
@@ -116,7 +116,7 @@ These two are provided by the (oop goops) module:
 
 The default duplicates handler is:
 
-  (replace warn last)
+  (replace warn-override-core warn last)
 
 A recommended handler (which is likely to correspond to future Guile
 behavior) can be installed with:

ice-9/ChangeLog

@@ -2,7 +2,7 @@
 
 	* boot-9.scm (ipow-by-squaring): Removed.
 	(default-duplicate-binding-handler): Set default to
-	'(replace warn last)
+	'(replace warn-override-core warn last)
 
 	* boot-9.scm (module-make-local-var!): Use module-add!.
 	(module-primitive-add!): New function.

ice-9/boot-9.scm

@@ -2904,7 +2904,7 @@
   (make-mutable-parameter #f))
 
 (define default-duplicate-binding-handler
-  (make-mutable-parameter '(replace warn last)
+  (make-mutable-parameter '(replace warn-override-core warn last)
 			  (lambda (handler-names)
 			    (default-duplicate-binding-procedures
 			      (lookup-duplicates-handlers handler-names))