The implementation module doesn't conform to its interface.
#2175 Compile-time error
The implementation module doesn't conform to its interface.
Additional Information
The implementation module exports X 'Y', which is not a part of the module's interface.
The implementation module exports a conversion-function which is not a part of the module's interface.
Explanation
An implementation module is not allowed to export any declarations
which are not already exported by the interface module it implements.