Jlink doesn't report anything when provider is not used by anyone.

Compile module in attached zip
javac -d out --module-source-path . `find . -name "*.java"`

Then run Jlink
jlink --module-path out:jdk/jmods --output jlink-out --add-modules m4 --suggest-providers p4.Impl

Nothing will be reported by jlink.
Expected "Services specified in --suggest-providers not used: p4.Impl"