Before the big 5.0 breaking change when ShouldBeEquivalentTo still existed I could do the following
var thing = GetMyComparable();
var expected = new MyClassThatImplementsIComparable();
thing.ShouldBeEquivalentTo(expected);
However after 5.0 when attempting to fix this by changing thing.ShouldBeEquivalentTo(expected) to thing.Should().BeEquivalentTo(expected) I notice that this is not possible. Should() is returning an IComparableAssertions object which does not have a BeEquivalentTo method.