Remove coercion with 2 types, which is only supported in ml syntax. #6829
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There are two forms of type coercion:
1
e: t0 :> t
2
e :> t
The first form was never supported in .res syntax, and is now removed from parsed and typed tree.
That said, coercion 1 is the only one that ever supported coercion with free variables. So this is subject to more investigation.
See #6828