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Make Control.Exception.throw levity polymorphic

The error function has a levity-polymorphic type. I propose that the same be done for throw. I just encountered a situation where I needed this, and instead of calling throw x, I had to call raise# (toException x) because throw is unnecessarily restrictive.

Trac metadata
Trac field Value
Version 8.2.2
Type Task
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
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Architecture
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