[S09] too-long subscript range behaves differently as rvalue or lvalue

Raku · Sep 8, 2010 · 7e40979 · 7e40979
1 parent 6924749
commit 7e40979
Showing 1 changed file with 6 additions and 4 deletions.
diff --git a/S09-data.pod b/S09-data.pod
@@ -13,8 +13,8 @@ Synopsis 9: Data Structures
 
     Created: 13 Sep 2004
 
-    Last Modified: 9 Jul 2010
-    Version: 47
+    Last Modified: 7 Sep 2010
+    Version: 48
 
 =head1 Overview
 
@@ -215,8 +215,10 @@ Attempting to access an index outside an array's defined range will fail:
     @dwarves[7] = 'Sneaky';   # Fails with "invalid index" exception
 
 However, it is legal for a range or series iterator to extend beyond the end
-of an array as long as its min value is a valid subscript; the range
-is truncated as necessary to map only valid locations.
+of an array as long as its min value is a valid subscript; when used as an
+rvalue, the range is truncated as necessary to map only valid locations.
+(When used as an lvalue, any non-existent subscripts generate WHENCE proxies
+that can receive new values and autovivify anything that needs it.)
 
 It's also possible to explicitly specify a normal autoextending array: