Don’t consider type arguments inside a constraint as constraints. #1870
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This better reflects their use. It allows arrow types and tuples to
appear in these positions. It also denies capability sets from appearing
in these positions. These have an extremely limited use, and are unlikely
to be used by anyone.
As a side effect, the default capability in these positions now
corresponds to the type default, rather than #any.
Also properly deny arrow types from appearing in constraints,
fixing #1809.
I'd like to add some positive tests for arrows and tuples in these positions,
but I'm not sure where they fit.