{"ast_node_type":"variable","tokens":[{"end":80,"kind":"keyword","start":0,"text":"let"}]}
        let argument_hir_ty: &hir::Ty<'_> = fn_decl.inputs.get(argument_index)?;
        let fn_decl = self.infcx.tcx.hir_fn_decl_by_hir_id(self.mir_hir_id())?;
        match argument_hir_ty.kind {