code: def _tool_classpath(self, tool, products, scheduler):
      
      classpath = self.tool_classpath_from_products(products,
                                                    self.versioned_tool_name(tool, self.version),
                                                    scope=self.options_scope)
      classpath = tuple(fast_relpath(c, get_buildroot()) for c in classpath)
  
      return self._memoized_scalac_classpath(classpath, scheduler)
docs: Return the proper classpath based on products and scala version.