rust-clippy: tell `clippy` we don't need to declare a default here
This is a struct only useful for tests.
= Mercurial XXX =
== New Features ==
== Default Format Change ==
These changes affect newly created repositories (or new clones) done with
Mercurial XXX.
== New Experimental Features ==
== Bug Fixes ==
== Backwards Compatibility Changes ==
== Internal API Changes ==
== Miscellaneous ==
* pullbundle support no longer requires setting a server-side option,
providing a .hg/pullbundles.manifest according to the syntax specified in
'hg help -e clonebundles' is enough.