targetType.TypeSymbol.Equals(valueType.TypeSymbol,TypeCompareKind.IgnoreNullableModifiersForReferenceTypes))// https://github.com/dotnet/roslyn/issues/29968 Allow assignment to base type.
areEquivalentTypes(targetType,valueType))// https://github.com/dotnet/roslyn/issues/29968 Allow assignment to base type.