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  1. or download this
      if (eval "use Module::Foo") {
     # I've got foo!
  } else {
     die $@ if $@;
  }
  2. or download this
      if (eval { require Module::Foo }) {
      Module::Foo->import() if Module::Foo->can('import');
...
  } else {
      die $@ if $@;
  }
  3. or download this
      if (eval { use Module::Foo }) {
      # I've got foo!
  } else {
      die $@ if $@;
  }