Justin Ridgewell 8cd4a62c02 Transform do-expressions on exit (#5694)
* Transform do-expressions on exit

This allows other transforms (notably, block scoping) to do their magic
first, possibly saving closures.

Also fixes a bug with declaring duplicate bindings (de-opts now).

* Use strict in exec test

* lint
2017-05-19 16:58:15 -04:00
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