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#!./perl
BEGIN {
chdir 't';
@INC = '../lib';
require './test.pl';
}
use strict;
use warnings;
plan (8);
# Historically constant folding was performed by evaluating the ops, and if
# they threw an exception compilation failed. This was seen as buggy, because
# even illegal constants in unreachable code would cause failure. So now
# illegal expressions are reported at runtime, if the expression is reached,
# making constant folding consistent with many other languages, and purely an
# optimisation rather than a behaviour change.
my $a;
$a = eval '$b = 0/0 if 0; 3';
is ($a, 3);
is ($@, "");
my $b = 0;
$a = eval 'if ($b) {return sqrt -3} 3';
is ($a, 3);
is ($@, "");
$a = eval q{
$b = eval q{if ($b) {return log 0} 4};
is ($b, 4);
is ($@, "");
5;
};
is ($a, 5);
is ($@, "");
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