@staticmethod<EOL><INDENT>def i_depend_on_them(decl):<DEDENT>
to_be_included = set()<EOL>for dependency_info in get_dependencies_from_decl(decl):<EOL><INDENT>for ddecl in dependency_info.find_out_depend_on_it_declarations():<EOL><INDENT>if ddecl:<EOL><INDENT>to_be_included.add(ddecl)<EOL><DEDENT><DEDENT><DEDENT>if isinstance(decl.parent, class_declaration.class_t):<EOL><INDENT>to_be_included.add(decl.parent)<EOL><DEDENT>return to_be_included<EOL>
Returns set of declarations. every item in the returned set,
        depends on a declaration from the input