Function refuse_unsupported_preemption_with_capabilities 

pub fn refuse_unsupported_preemption_with_capabilities(
    config: &Config,
    backend: &'static str,
    capabilities: BackendCapabilities,
    maximum_requested: bool,
    skid_margin_requested: bool,
) -> Result<(), UnsupportedPreemption>

The same admission for an executable’s statically declared physical adapter. The name is diagnostic identity; the supplied capabilities determine policy. This never launches a runtime or changes the requested configuration.