Compiler Error CS8141

The tuple element names in the signature of method must match the tuple element names of interface method (including on the return type).

Example

The following sample generates CS8141:

C#

// CS8141.cs (10,27)
using System.Collections;

public interface IGrabber<out T>
{
    T GetOne();
}

class SomeGrabber : IGrabber<(int, int)>
{
    public (int a, int b) GetOne()
    {
        return (1, 2);
    }
}

To correct this error

Changing the signature of the GetOne method to return an unnamed tuple, matching the unnamed tuple in the interface, will correct this error:

C#

    public (int, int) GetOne()
    {
        return (1, 2);
    }