{"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"NllRegionVariableOrigin::Placeholder(_)"}]}
            NllRegionVariableOrigin::Placeholder(_)
            | NllRegionVariableOrigin::Existential { from_forall: false } => true,
            | NllRegionVariableOrigin::Existential { from_forall: true } => false,