{"ast_node_type":"function","tokens":[{"end":84,"kind":"keyword","start":0,"text":"fn"}]}
    fn lower_ty(&mut self, t: &Ty, itctx: ImplTraitContext) -> &'hir hir::Ty<'hir> {
    #[instrument(level = "debug", skip(self))]
        self.arena.alloc(self.lower_ty_direct(t, itctx))