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A generic type is invoked passing a type argument of Nullable<T> to a type parameter with a Structure constraint.
The common language runtime (CLR) specifically disallows the Nullable<T> structure as a type argument to itself. Even though it is a structure and would otherwise satisfy a Structure constraint, using it recursively could lead to awkward constructions such as Nullable(Of Nullable(Of Nullable)).
Error ID: BC32115
To correct this error
- Either remove the Structure constraint from the type parameter, or change the type argument to some value type other than Nullable<T>.