Turn on $Data::Dumper::Terse and only use eval STRING as eval BLOCK is not what you want e.g

use warnings;
use strict;
use Data::Dumper;
use Test::More qw(no_plan);

package Foo;
sub new {bless {'a' => 1}, $_[0]};

package main;
my $foo = Foo->new();
my $foo_dumped_evaled;

$Data::Dumper::Terse = 1;

$foo_dumped_evaled = eval(Dumper($foo));
isa_ok($foo_dumped_evaled,'Foo'); #fails

$foo_dumped_evaled = eval{Dumper($foo)};
isa_ok($foo_dumped_evaled,'Foo'); #fails

print Dumper($foo);

__output__

ok 1 - The object isa Foo
not ok 2 - The object isa Foo
#     Failed test (pmsopw_478513.pl at line 19)
#     The object isn't a reference
bless( {
                 'a' => 1
               }, 'Foo' )
1..2
# Looks like you failed 1 test of 2.
[download]

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