<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _extra_compile_time_classpath(self):
 """Compute any extra compile-time-only classpath elements."""

    def extra_compile_classpath_iter():
      for conf in self._confs:
        for jar in self.extra_compile_time_classpath_elements():
          yield (conf, jar)

    return list(extra_compile_classpath_iter())