Generic Constraint for Non Nullable types

From C# 8.0 you can now use the where T : notnull generic constraint to specificy T is a non-nullable type.

Applying where T : struct applies a generic constraint that T be a non-nullable value type. Since there are no non-nullable reference types, this has the exact same semantics as simply "all non-nullable types". Nullable value types (i.e. Nullable<T>) do not satisfy the struct generic constraint.