[S06] rw parameters can never be optional

You can't put a default on a parameter marked "rw".
Raku · Nov 17, 2010 · 44511d7 · 44511d7
1 parent 977d920
commit 44511d7
Showing 1 changed file with 5 additions and 3 deletions.
diff --git a/S06-routines.pod b/S06-routines.pod
@@ -16,8 +16,8 @@ Synopsis 6: Subroutines
 
     Created: 21 Mar 2003
 
-    Last Modified: 25 Oct 2010
-    Version: 145
+    Last Modified: 16 Nov 2010
+    Version: 146
 
 This document summarizes Apocalypse 6, which covers subroutines and the
 new type system.
@@ -2201,7 +2201,9 @@ to a readonly parameter never triggers autovivification.
 
 Specifies that the parameter can be modified (assigned to, incremented,
 etc). Requires that the corresponding argument is an lvalue or can be
-converted to one.
+converted to one.  Since this option forces an argument to be required,
+it cannot co-exist with any marks that indicate an optional parameter,
+such as C<?> or a default value.
 
 When applied to a variadic parameter, the C<rw> trait applies to each
 element of the list: