Rafael Ávila de Espíndola c5a766f133 Fix two invalid import cases we were not detecting:
* If an import was unused we would never print any errors for it.
* We would keep the existing environment in scope when descending 'foo.bar'
  and would find 'bar' in the global environment if there was no 'bar' in
  'foo'.
2011-01-11 13:58:39 -08:00
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