Author: lwall
Date: 2009-11-11 18:18:19 +0100 (Wed, 11 Nov 2009)
New Revision: 29056
Modified:
docs/Perl6/Spec/S04-control.pod
Log:
[S04] clarify Nil semantics of empty blocks and missing branches, pmurias++
Modified: docs/Perl6/Spec/S04-control.pod
===================================================================
--- docs/Perl6/Spec/S04-control.pod 2009-11-11 17:13:35 UTC (rev 29055)
+++ docs/Perl6/Spec/S04-control.pod 2009-11-11 17:18:19 UTC (rev 29056)
@@ -195,10 +195,10 @@
=head1 The Relationship of Blocks and Statements
The return value of a block is the value of its final statement.
-The value of an empty block is C<Nil>.
(This is subtly different from Perl 5's behavior, which was to return
the value of the last expression evaluated, even if that expression
-was just a conditional.)
+was just a conditional.) If there are no statements in the block,
+the result is C<Nil>.
=head1 Statement-ending blocks
@@ -264,7 +264,8 @@
...
}
-If the final statement is a conditional which does not execute any
+The result of a conditional statement is the result of the block
+chosen to execute. If the conditional does not execute any
branch, the return value is C<Nil>.
The C<unless> statement does not allow an C<elsif> or C<else> in Perl 6.
