#[double]Expand description
Generates a trait which replicates the original trait method for method. It does implement the
original trait for each of its implementations, by means of forwarding the method calls. The
utility comes from the fact that the generated trait has default implementations for each method
using unimplemented!(), which makes it useful for testing purposes.
If a test requires an implementation of an original trait Org yet would only invoke one of its
methods, implementing the mirrored method on an implementation of the generated trait OrgDummy
is sufficient. The other methods would not be inovked in the test, so their default
implementation using unimplemented!() would not be reached.
The argument passed to the attribute is used as the name of the generated trait.