use warnings;
use strict;
use Test::Simple tests => 3;
package Foo;
use overload
nomethod => sub { die "unimplemented\n" };
sub new { bless {}, shift };
package main;
my $foo = Foo->new;
eval {my $val = $foo + 1};
ok( $@ =~ /unimplemented/ );
eval {$foo += 1};
ok( $@ =~ /unimplemented/ );
eval {my $val = 0; $val += $foo};
ok( $@ =~ /unimplemented/ );