Doug Gregor 879b1802f0 [GSB] Downgrade "neither type in same-type has a generic param" error to warning. ...

There is nothing specifically wrong with uttering a same-type
constraint in a where clause where both sides are concrete
types. Downgrade this to a warning; we'll check that the concrete
types match (of course), and such a well-formed constraint will simply
be canonicalized away.

This aids the migration of IndexDistance from an associated type to
Int.

2017-12-07 14:44:35 -08:00

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