{"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"common::build_langcall(&bx,"}]}
            common::build_langcall(&bx, self.mir.span, reason.lang_item());
        let (fn_abi, fn_ptr, instance) =
        if is_call_from_compiler_builtins_to_upstream_monomorphization(bx.tcx(), instance) {