Typed Racket
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Sam Tobin-Hochstadt f581c7796d Refactor environments.
- mapping stored as dict
 - use id tables for identifiers
 - use env-filter instead of filter
 - eliminate spurious use of conses

original commit: 647c4eef5940fde0395f9a19496244acab5f62b2
2010-06-21 18:29:54 -04:00
collects Refactor environments. 2010-06-21 18:29:54 -04:00