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Change Typ_arg_ to A_. We use it a lot more now typ_arg is used instead of
uvar as the result of unify. Plus A_ could either stand for argument, or
Any/A type which is quite appropriate in most use cases.
Restore instantiation info in infer_funapp'. Ideally we would save this
instead of recomputing it ever time we need it. However I checked and
there are over 300 places in the code that would need to be changed to add
an extra argument to E_app. Still some issues causing specialisation to
fail however.
Improve the error message when we swap how we infer/check an l-expression,
as this could previously cause the actual cause of a type-checking failure
to be effectively hidden.
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