Constant MX_INHERITED_PARAM_PREFIX 

pub(crate) const MX_INHERITED_PARAM_PREFIX: &str = ".__MX_INHERITED_PARAM__(";

Marker prefix emitted by the proc-macro when a subclass method param might be inherited from a parent class documented in-package. Resolved at write-time in registry.rs to either nothing (parent is documented → roxygen2 inherits) or (no documentation available) (parent not found or not in-package).