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Re: Why doesn't "my ($x) = @);" generate a syntax error?

by tobyink (Abbot)
on Jun 13, 2013 at 06:50 UTC ( #1038686=note: print w/ replies, xml ) Need Help??


in reply to Why doesn't "my ($x) = @);" generate a syntax error?

For any punctuation character x, if there is a magic variable called $x, then there must also be magic variables called @x and %x. That's an artefact of how current versions of the Perl parser work. So because the $) exists and does something useful, the @) variable must also exist (even if it does nothing useful!)

package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name


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Re^2: Why doesn't "my ($x) = @);" generate a syntax error?
by zork42 (Monk) on Jun 13, 2013 at 06:57 UTC
    I'd have never realised that.
    Thanks!
Re^2: Why doesn't "my ($x) = @);" generate a syntax error?
by Grimy (Pilgrim) on Jun 13, 2013 at 17:57 UTC
    Correction: for any punctuation character x except '[' and '{', there exist global variables $x, @x and %x. Those variables are not necessarily magic, and their existence doesn't depend on the fact that $x does something useful. For example, none of $}, @} and %} are magic, yet they are all global variables.

      $[, @[ and %[ work (or at least they do in 5.18.0). If ${, @{ and %{ were to work, that would break dereferencing.

      package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

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