{"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"//"}]}
    // and parent fn's generics compressed into one list.
    // For an RPITIT, synthesize generics which are equal to the opaque's generics
    if let Some(ty::ImplTraitInTraitData::Trait { fn_def_id, opaque_def_id }) =