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Re^2: How does 'goto LABEL' search for its label? (do-blocks)

by LanX (Canon)
on Jan 17, 2013 at 18:50 UTC ( #1013854=note: print w/ replies, xml ) Need Help??

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  1. or download this
    > perl -MO=Deparse -E'if (1) { label: say 1;}; goto label'
    BEGIN {
    ...
        label: say 1
    };
    goto label;
    
  2. or download this
    perl -wE'do { label: say 1;}; goto label'
    
  3. or download this
    perl -wE'my $x=0;do { label: say $x++; die if $x>1}; goto label'
    0
    1
    Died at -e line 1.
    
  4. or download this
    [davido]: LanX: perl -E 'goto IN; do{ IN: say "Hello world\n";};' does
    + produce the warning on 5.16.2.
    

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