Slava Pestov 52c1c8caaf Sema: Clean up solving BindParam constraint ...

- Avoid creating an unnecessary type variable
- Even if both sides are type variables we can solve them if the LHS cannot
  bind to an InOut or the RHS cannot bind to an LValue; in this case the two
  types are identical and we can merge them

2019-01-12 18:03:01 -05:00

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