Yes, providing quite broken 'tie' implementations can make any code blow up. q-:

Fixing your code so that it works and also demonstrates that things don't stop being tied shows that my code works fine with such things: 

#!/usr/bin/perl -w
use strict;

# my $x = 1;
tie my $x, 'Tie', 1;
my $f = sub { $x };
print $f->(), "\n"; # => 1
{
    my $scope= tempSet( \$x, 2 );
    print $f->(), "\n"; # => 2
}
print $f->(), "\n"; # => 1

sub TempSet::DESTROY { shift(@_)->() }
sub tempSet {
    my( $sv, $new )= @_;
    my $prior= $$sv;
    my $restore= bless
        sub { $$sv= $prior },
        'TempSet';
    $$sv= $new;
    return $restore;
}

sub Tie::TIESCALAR { return bless \$_[1] => $_[0] }
sub Tie::FETCH { return "${$_[0]} is still tied at line " . (caller())
+[2] }
sub Tie::STORE { ( ${$_[0]} = $_[1] ) =~ s/ is still tied at line \d+$
+// }

[download]

which produces 

1 is still tied at line 7
2 is still tied at line 10
1 is still tied at line 12

[download]

(Updated code to make tied-ness more apparent.)

(Yes, in constrast, local is implemented in a way that it temporarily hides the tied nature of the localized scalar.)

- tye        

In reply to Re^3: Local for lexicals (KISS) by tye
in thread Local for lexicals by JadeNB

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