Nathan Shively-Sanders 9f7621c7e2 Contextual signatures without thisType return anyType
If a contextual signature is found, if its thisType is undefined, then the contextual type of `this` is now `any`.
Previously `checkThisExpression` would keep looking for a different type for `this`.

Also update tests to show this new behaviour.
2016-04-28 14:17:11 -07:00
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