@staticmethod<EOL><INDENT>def we_depend_on_them(decls):<DEDENT>
to_be_included = set()<EOL>for decl in decls:<EOL><INDENT>to_be_included.update(dependency_info_t.i_depend_on_them(decl))<EOL><DEDENT>return to_be_included<EOL>
Returns set of declarations. every item in the returned set,
        depends on a declaration from the input