This repository demonstrates a bug in the 05/14/18 C# Nullable Reference Types Preview with Visual Studio 2017 15.7.1. It corresponds to dotnet/roslyn#27008.
It features two assemblies:
InterfaceLibraryTestCs8614
TestCs8614 has a reference to InterfaceLibrary.
There are two interfaces defined: IInterfaceInThisAssembly and IInterfaceInOtherAssembly.
The former is defined in TestCs8614, the latter in InterfaceLibrary. They are both identical, defining a single method with the signature void Test(int?).
An implementation is defined for each interface: ImplementsThisAssemblyInterface and ImplementsOtherAssemblyInterface respectively.
They are both defined in TestCs8614.
The implementation of ImplementsThisAssemblyInterface exhibits no compiler warnings.
The implementation of ImplementsOtherAssemblyInterface exhibits the following compiler warning on the implementation of the Test method:
warning CS8614: Nullability of reference types in type of parameter 'nullableInt' doesn't match implicitly implemented member 'void
It is expected that the implementation of Test on ImplementsOtherAssemblyInterface does not exhibit CS8614.