package and do

esskar has asked for the wisdom of the Perl Monks concerning the following question:

my $foo = do { package Foo; local $/; <DATA>; };
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works, reads the __DATA__ section in Foo and writes it to $foo

my $class = 'Bar';
my $bar = do { eval "package $bar"; local $/; <DATA>; };
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does not work - probably because eval "package $bar" has its own scope.
Any ideas how i can solve my problem?