Pavel Yaskevich 38165e266c [QoI] Strip BindOptionalExpr from assignment that discards target ...

Right before generating constraints for the new system,
check if there are any BindOptionalExpr in the tree which
wrap DiscardAssignmentExpr, such situation corresponds to syntax
like - `_? = <value>`, since it doesn't really make
sense to have optional assignment to discarded LValue which can
never be optional, we can remove BOE from the tree and avoid
generating any of the uncessary constraints.

2016-12-18 14:28:27 -08:00

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