google/traceur-compiler — pull request #1439 by guybedford (2014-10-27 09:52:53+00:00)
Title: Ensure that local exports have preference over export *

Whenever an `export *` statement is used, the variable `$__exportNames` is declared as the array of known export names. Before updating a binding for an `export *` item, we first check against this list and skip if already present.