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| author | Robin Barker <RMBarker@cpan.org> | 2001-11-15 13:48:34 +0000 |
|---|---|---|
| committer | Abhijit Menon-Sen <ams@wiw.org> | 2001-11-15 12:56:49 +0000 |
| commit | bf1f881789eedea18ed5f17829aaa1c73d7cf6f7 (patch) | |
| tree | 48de962927a9dea3ef5f44df43664939bc2c6e5d /pod/perltrap.pod | |
| parent | 9a1f07e743e42a0b7bb5626198fd8bf95eba6fbc (diff) | |
| download | perl-bf1f881789eedea18ed5f17829aaa1c73d7cf6f7.tar.gz | |
Re: Strange syntax error with map
Message-Id: <200111151348.NAA01299@tempest.npl.co.uk>
(Applied with tweaks.)
p4raw-id: //depot/perl@13017
Diffstat (limited to 'pod/perltrap.pod')
| -rw-r--r-- | pod/perltrap.pod | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/pod/perltrap.pod b/pod/perltrap.pod index 262937910d..831d2d5402 100644 --- a/pod/perltrap.pod +++ b/pod/perltrap.pod @@ -651,6 +651,16 @@ are to used around the name. # perl4 prints: {a} # perl5 prints: 2 +=item * Parsing + +When perl sees C<map {> (or C<grep {>), it has to guess whether the C<{> +starts a BLOCK or a hash reference. If it guesses wrong, it will report +a syntax error near the C<}> and the missing (or unexpected) comma. + +Use unary C<+> before C<{> on a hash reference, and unary C<+> applied +to the first thing in a BLOCK (after C<{>), for perl to guess right all +the time. (See L<perlfunc/map>.) + =back =head2 Numerical Traps |