Author: lwall
Date: 2009-09-02 20:21:39 +0200 (Wed, 02 Sep 2009)
New Revision: 28171
Modified:
docs/Perl6/Spec/S03-operators.pod
Log:
[S03] forbid List and Range as endpoint to ranges
Modified: docs/Perl6/Spec/S03-operators.pod
===================================================================
--- docs/Perl6/Spec/S03-operators.pod 2009-09-02 17:40:44 UTC (rev 28170)
+++ docs/Perl6/Spec/S03-operators.pod 2009-09-02 18:21:39 UTC (rev 28171)
@@ -14,8 +14,8 @@
Created: 8 Mar 2004
- Last Modified: 31 Aug 2009
- Version: 171
+ Last Modified: 2 Sep 2009
+ Version: 172
=head1 Overview
@@ -1080,17 +1080,23 @@
$min ..^ $max
$min ^..^ $max
-Constructs Range objects, optionally excluding one or both endpoints.
+Constructs C<Range> objects, optionally excluding one or both endpoints.
See L</Range and RangeIterator semantics>.
-Note that these differ:
+Ranges do no coercions, and are defined specifically for numeric
+or stringish arguments (including enumerated types); in particular,
+it is illegal to use a C<Range> or a C<List> as implicitly numeric:
0 ..^ 10 # 0 .. 9
- 0 .. ^10 # 0 .. (0..9)
+ 0 .. ^10 # ERROR
-(It's not yet clear what the second one should mean, but whether it
-succeeds or fails, it won't do what you want.)
+However, C<Array> types in the second argument are assumed to be intended as
numeric:
+ 0 ..^ @x # okay
+ 0 ..^ +...@x # same thing
+
+C<Whatever> types are also supported. See L</Range and RangeIterator
semantics>.
+
=back
=head2 Chaining binary precedence
