Possible Values

None

Optional0

Optional1

Optional2

Optional3

AllOptional

All arguments to the expression are optional. Compute will be called when HasValue is false for individual, or all, values

OmitComputeWarning

A warning should not be emitted when Compute returns false, indicating this is an expected condition, or the derived class will emit its own diagnostics

DeprecatedVirtualFlags

DeprecatedVirtualUnary