Author: larry
Date: Wed Apr 5 16:21:23 2006
New Revision: 8564
Modified:
doc/trunk/design/syn/S02.pod
doc/trunk/design/syn/S03.pod
Log:
Additional clarifications on how to reduce non-infix ops.
Modified: doc/trunk/design/syn/S02.pod
==============================================================================
--- doc/trunk/design/syn/S02.pod (original)
+++ doc/trunk/design/syn/S02.pod Wed Apr 5 16:21:23 2006
@@ -84,7 +84,8 @@
To be future proof, though, you should omit the space or use dot.
(A consequence of this rule is that a dot with whitespace in front of it
-is always considered a method call on C<$_>.)
+is always considered a method call on C<$_>. If a term is not expected at
+this point, it is a syntax error.)
=item *
Modified: doc/trunk/design/syn/S03.pod
==============================================================================
--- doc/trunk/design/syn/S03.pod (original)
+++ doc/trunk/design/syn/S03.pod Wed Apr 5 16:21:23 2006
@@ -295,6 +295,14 @@
for an operation can call C<infix:{$opname}()> to discover it.
(There is no explicit identity property.)
+To call some other non-infix function as a reduce operator, you must
+define an alias in infix form. The infix form will parse the right
+argument as a scalar even if the aliased function would have parsed it
+as a list:
+
+ &infix:<dehash> ::= postcircumfix:<{}>;
+ $x = [dehash] $a,'foo','bar'; # $a<foo><bar>, not $a<foo bar>
+
=head1 Junctive operators
C<|>, C<&>, and C<^> are no longer bitwise operators (see L</Operator
