Re: Variable being clobbered by a seemingly unrelated while loop

That last for loop is only executing once and it's assigning $runlvl to $_. The matches within the loop are matching on $_, and apparently the call to process is indeed bashing $_. If you change that last loop to

for my $xx ($runlvl) {
  $xx =~ /2/ and process($0);
  $xx =~ /3/ and finalize();
}
[download]

your problem likewise goes away.

(which surprises me a bit since I thought $_ was always implicitly localized but apparently not, since if we instead put a local $_; declaration in process() the problem likewise disappears.)

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Re^2: Variable being clobbered by a seemingly unrelated while loop by tobyink (Canon) on Oct 08, 2014 at 09:48 UTC
`$_` is localized in `for` loops, but not `while` loops. (Indeedy any variable is localized in a `for` loop. Even lexical variables.) toby döt ink	[reply] [d/l] [select]
Re^3: Variable being clobbered by a seemingly unrelated while loop by choroba (Cardinal) on Oct 08, 2014 at 11:47 UTC
Even lexical variables. But, `my $x = 3; local $x'` [download] leads to `Can't localize lexical variable $x at 1.pl line 2.` [download] لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ	[reply] [d/l] [select]
Re^4: Variable being clobbered by a seemingly unrelated while loop by tobyink (Canon) on Oct 08, 2014 at 12:33 UTC
Lexical variables can be localized - you just can't use the `local` keyword to do so. Anonymous monk provides a good demonstration. toby döt ink	[reply] [d/l]
Re^4: Variable being clobbered by a seemingly unrelated while loop by Anonymous Monk on Oct 08, 2014 at 12:15 UTC
I guess tobyink means: `my $x='foo'; for $x ('bar') { print "$x\n"; } print "$x\n"; __END__ bar foo` [download]	[reply] [d/l]
Re^3: Variable being clobbered by a seemingly unrelated while loop by wrog (Friar) on Oct 10, 2014 at 18:29 UTC
Right. No I was thinking `$_` was implicitly localized in `sub`s, but now I see `perlsub` explicitly warns against expecting this.	[reply] [d/l] [select]