require Foo::Bar;     # a splendid bareword

##</code><code>##

    my $class = 'Foo::Bar';
    require $class;       # $class is not a bareword
#or
    require "Foo::Bar";   # not a bareword because of the ""

##</code><code>##

eval "require $class";

##</code><code>##

require "Foo/Bar.pm";