{"ast_node_type":"function","tokens":[{"end":92,"kind":"keyword","start":0,"text":"fn"}]}
    fn impl_trait_in_bindings_ctxt(&self, position: ImplTraitPosition) -> ImplTraitContext {
    /// the feature gate is enabled, or issues a feature error if it is not.
        if self.tcx.features().impl_trait_in_bindings() {