blackhat:

From perldoc -f use:

  use Module VERSION LIST
  use Module VERSION
  use Module LIST
  use Module
  use VERSION
       Imports some semantics into the current package from the named
       module, generally by aliasing certain subroutine or variable
       names into your package.  It is exactly equivalent to

         BEGIN { require Module; Module->import( LIST ); }

       except that Module must be a bareword.

So you might try calling the import method for the package.

Alternatively, you can fully-qualify the call to include the package name, like: modules::gts::generate_throws_simple().

...roboticus

When your only tool is a hammer, all problems look like your thumb.