{"ast_node_type":"variable","tokens":[{"end":55,"kind":"keyword","start":0,"text":"let"}]}
        let catch_func = llvm::get_param(bx.llfn(), 2);
        let data = llvm::get_param(bx.llfn(), 1);
        let try_func_ty = bx.type_func(&[bx.type_ptr()], bx.type_void());