Author: autrijus
Date: Fri Feb 24 12:21:45 2006
New Revision: 7853
Modified:
doc/trunk/design/syn/S04.pod
Log:
* S04: The "If a curly occurs by a line by itself, then it
stands for end of statement" rule from A04 is brought
foward and further generalized -- now it only has to be
at the end of line. This allows:
# semicolon optional after an end-of-line brace
try { ... }
another_expression;
and forbids:
# comma needed between two subs
sub f { ... } sub g { ... }
Modified: doc/trunk/design/syn/S04.pod
==============================================================================
--- doc/trunk/design/syn/S04.pod (original)
+++ doc/trunk/design/syn/S04.pod Fri Feb 24 12:21:45 2006
@@ -12,9 +12,9 @@ Larry Wall <[EMAIL PROTECTED]>
Maintainer: Larry Wall <[EMAIL PROTECTED]>
Date: 19 Aug 2004
- Last Modified: 31 Jan 2006
+ Last Modified: 24 Feb 2006
Number: 4
- Version: 8
+ Version: 9
This document summarizes Apocalypse 4, which covers the block and
statement syntax of Perl.
@@ -92,6 +92,33 @@ value will be restored only if the curre
or hypotheticalize the value or the variable depending on whether you
do assignment or binding.
+=head1 Statement-ending blocks
+
+A line ending with a closing brace "C<}>", followed by nothing but
+whitespace or comments, will terminates statement if an end of statement
+can occur there. That is, these two statements are equivalent:
+
+ my $x = sub { 3 }
+ my $x = sub { 3 };
+
+End-of-statement cannot occur within a bracketed expression, so
+this still works:
+
+ my $x = [
+ sub { 3 }, # this comma is not optional
+ sub { 3 } # the statement won't terminate here
+ ];
+
+Because subroutine declarations are expressions, not statements,
+this is now invalid:
+
+ sub f { 3 } sub g { 3 } # two terms occur in a row
+
+But these two are valid:
+
+ sub f { 3 }; sub g { 3 };
+ sub f { 3 }; sub g { 3 } # the trailing semicolon is optional
+
=head1 Conditional statements
The C<if> and C<unless> statements work almost exactly as they do in
