Fix #2745: Dealias before either #2746
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"either" cuts the search space for subtyping. Before we do this,
we should delias the other side to see whether there's something
else we can do instead. In the case
A <:< B | C
we can also safely widen `A` because singleton types are not allowed
in disjunctions.
sjrd
approved these changes
Jun 13, 2017
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"either" cuts the search space for subtyping. Before we do this,
we should delias the other side to see whether there's something
else we can do instead. In the case
we can also safely widen
Abecause singleton types are not allowedin disjunctions.