you have to assign the coderef to the new glob.
For simplicity the following code is a cut&paste from my scratchpad, (had to help KennethK in the CB to figure it out)
use strict;
use warnings;
$\="\n";
*tst=sub { print "orig" };
tst();
my $safe=\&tst;
{
no warnings;
*tst=sub { print "new"};
}
tst();
{
no warnings;
*tst=$safe;
}
tst();
it shows how to safe, replace and reestablish a function.
If you use local *tst=sub {...} you can also restrict the new function till the end of scope.
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