test is reversed, but the conditional is still tested before the first
iteration.
-In either the C<if> or the C<while> statement, you may replace "(EXPR)"
-with a BLOCK, and the conditional is true if the value of the last
-statement in that block is true. While this "feature" continues to work in
-version 5, it has been deprecated, so please change any occurrences of "if BLOCK" to
-"if (do BLOCK)".
+The form C<while/if BLOCK BLOCK>, available in Perl 4, is no longer
+available. Replace any occurrence of C<if BLOCK> by C<if (do BLOCK)>.
=head2 For Loops
You probably shouldn't rely upon the warn() being podded out forever.
Not all pod translators are well-behaved in this regard, and perhaps
the compiler will become pickier.
+
+One may also use pod directives to quickly comment out a section
+of code.
+
+=head2 Plain Old Comments (Not!)
+
+Much like the C preprocessor, perl can process line directives. Using
+this, one can control perl's idea of filenames and line numbers in
+error or warning messages (especially for strings that are processed
+with eval()). The syntax for this mechanism is the same as for most
+C preprocessors: it matches the regular expression
+C</^#\s*line\s+(\d+)\s*(?:\s"([^"]*)")?/> with C<$1> being the line
+number for the next line, and C<$2> being the optional filename
+(specified within quotes).
+
+Here are some examples that you should be able to type into your command
+shell:
+
+ % perl
+ # line 200 "bzzzt"
+ # the `#' on the previous line must be the first char on line
+ die 'foo';
+ __END__
+ foo at bzzzt line 201.
+
+ % perl
+ # line 200 "bzzzt"
+ eval qq[\n#line 2001 ""\ndie 'foo']; print $@;
+ __END__
+ foo at - line 2001.
+
+ % perl
+ eval qq[\n#line 200 "foo bar"\ndie 'foo']; print $@;
+ __END__
+ foo at foo bar line 200.
+
+ % perl
+ # line 345 "goop"
+ eval "\n#line " . __LINE__ . ' "' . __FILE__ ."\"\ndie 'foo'";
+ print $@;
+ __END__
+ foo at goop line 345.
+
+=cut