The strict and warnings modules are special because they are pragmas. They get imported into whichever level is currently still being compiled.

Try something like this:

{
  package Base;
  use File::Spec::Functions;

  sub import {
    File::Spec::Functions->import;
  }
}

{
  package A;
  use Base;  # Now A doesn't have File::Spec::Functions!!!
}
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There's an Import::Into module which does allow you to pass an argument indicating where to import stuff into.

{
  package Base;
  use File::Spec::Functions;
  use Import::Into;

  sub import {
    File::Spec::Functions->import::into( 1 );  # caller level 1
  }
}

{
  package A;
  use Base;  # Now A has File::Spec::Functions
}
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