Pavel Yaskevich 16c1f50eda [ConstraintSystem] Diagnose incorrect use of _ during constraint generation ...

`_` or discard assignment expression should only be used on the left-hand
side of the assignment expression. Incorrect uses are easy to detect during
constraint generation which also allows us to avoid complications related
to other diagnostics when `_` is used incorrectly.

2020-03-24 16:51:44 -07:00

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