A new clippy-json ninja target will now be generated for rust projects.
rust-analyzer supports non-cargo based projects so long as you provide it with a rust-project.json file and a custom “check command” to provide compiler errors. Meson already for some time has generated a rust-project.json file for rust-analyzer, but had no way to hook up its rustc/clippy output to rust-analyzer.
To use the new feature, you need to override the rust-analyzer check command as shown in the rust-analyzer documentation, and set it to a ninja invocation along the lines of ninja clippy-json -C build`.