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

by LanX (Chancellor)
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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[Corion]: GotToBTru: Yeah, I started a quick(ly implemented but slowly running) implementation of a program that would guess the "best" configuration (that is, least amount of changes) from my code, but then found that it stops parsing the source as soon as it ..
[GotToBTru]: sadly, it can't do anything about this
[Corion]: ... encounters sub foo($bar,$baz) {, which is something I like nowadays
[Corion]: GotToBTru: Yeah, that stuff is hard to do away automatically ;)
[GotToBTru]: yeah, you mentioned it could not handle signatures
[Corion]: And so far I like signatures and nobody has yet come up to me and screamed at me for implementing a source filter to handle them even on early Perl versions ;)
[Corion]: I should re-prod tsee about the Filter::Simple branches that he might want to merge or that I should merge so he can do a release ;-D

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