Author: larry Date: Fri Feb 15 10:17:28 2008 New Revision: 14509 Modified: doc/trunk/design/syn/S03.pod
Log: Tightened up rules on grammar-munging subs, must use term:<foo> or prefix:<foo> Sigs of () and ($x) are no longer enough. Modified: doc/trunk/design/syn/S03.pod ============================================================================== --- doc/trunk/design/syn/S03.pod (original) +++ doc/trunk/design/syn/S03.pod Fri Feb 15 10:17:28 2008 @@ -12,9 +12,9 @@ Maintainer: Larry Wall <[EMAIL PROTECTED]> Date: 8 Mar 2004 - Last Modified: 8 Feb 2008 + Last Modified: 15 Feb 2008 Number: 3 - Version: 131 + Version: 132 =head1 Overview @@ -2284,19 +2284,24 @@ =item * -A function predeclared as 0-ary is never considered a list -operator, though it allows an optional set of empty parentheses. -Unlike functions and list operators with arguments (see above), -a 0-ary function does not require parentheses even if followed +A function predeclared with an empty signature is considered 0-ary +at run time but is still parsed as a list prefix operator, and looks +for a following list. To declare a function that is parsed +as a simple 0-ary term, you must use the form C<< term:<foo> >>. +Such a term is never considered a list prefix operator, though it +allows an optional set of empty parentheses (because it represents a +C<Code> object). Unlike functions and list operators with arguments +(see above), a 0-ary term does not require parentheses even if followed immediately by a postfix. =item * -A non-multi sub predeclared with an arity of exactly 1 parses -as a named unary in precedence. All other subs with arguments -parse as list operators. (In other words, a named unary operator -may be declared to take extra arguments only if they are named-only -arguments.) +A non-multi sub predeclared with an arity of exactly 1 also still +parses as a list prefix operator. You must explicitly use the form +C<< prefix:<foo> >> to declare C<foo> as a named unary in precedence; +it must still take a single positional parameter (though any number of +named parameters are allowed, which can be bound to adverbs). +All other subs with arguments parse as list operators. =item *
