I'm puzzled with this little problem (a fragment is to reproduce it, never mind what it was doing originally):

C:\>perl -we "sub parse{${$_[0]}=~/\Gfoo/gc or die} parse \('foo') for
+ 1..2"
Died at -e line 1.

C:\>perl -we "sub parse{${$_[0]}=~/\Gfoo/gc or die} parse \(''.'foo') 
+for 1..2"

C:\>perl -MO=Deparse -we "sub parse{${$_[0]}=~/\Gfoo/gc or die} parse 
+\('foo') for 1..2"
BEGIN { $^W = 1; }
sub parse {
    die unless ${$_[0];} =~ /\Gfoo/cg;
}
parse \'foo' foreach (1 .. 2);
-e syntax OK

C:\>perl -MO=Deparse -we "sub parse{${$_[0]}=~/\Gfoo/gc or die} parse 
+\(''.'foo') for 1..2"
BEGIN { $^W = 1; }
sub parse {
    die unless ${$_[0];} =~ /\Gfoo/cg;
}
parse \'foo' foreach (1 .. 2);
-e syntax OK
[download]

I'd expect, because of constants folding, two fragments of code to behave the same. Also, see B::Deparse output. Yet code runs differently.

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