How do I know if my plugin is loaded?

[som-snytt]

Compiler doesn't tell me if my plugin is junk even though I "require" it.

~/projects/dotty/bin/scalacQ -Xplugin-list -Xplugin-require junk

Discussed in #21238

^{Originally posted by kincsescsaba July 21, 2024}
Hi there,

I had a working plugin and could not isolate why it had stopped working. There are no error messages. What I see is that I can add the plugin with -Xplugin:path/to/jar, and there are no error messages, but the plugin does not do its job of filtering specific code parts that worked previously.

I tried scala -Xplugin:path/to/jar -Xplugin-list options, this returns an empty line, then quits.

What are the best practices to resolve an issue like this?

[som-snytt]

Is a plugin permitted to produce no phases?

Maybe the default initialize should return a sentinel phase that is not enabled.