{"id":2223672,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2223672/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/patch/20260415235200.1576761-1-polacek@redhat.com/","project":{"id":17,"url":"http://patchwork.ozlabs.org/api/1.1/projects/17/?format=json","name":"GNU Compiler Collection","link_name":"gcc","list_id":"gcc-patches.gcc.gnu.org","list_email":"gcc-patches@gcc.gnu.org","web_url":null,"scm_url":null,"webscm_url":null},"msgid":"<20260415235200.1576761-1-polacek@redhat.com>","date":"2026-04-15T23:52:00","name":"c++/reflection: null reflection in inform_tree_category","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"b58f7461971f7496c46ac19ca4b1d441d5d1c795","submitter":{"id":14370,"url":"http://patchwork.ozlabs.org/api/1.1/people/14370/?format=json","name":"Marek Polacek","email":"polacek@redhat.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/gcc/patch/20260415235200.1576761-1-polacek@redhat.com/mbox/","series":[{"id":500055,"url":"http://patchwork.ozlabs.org/api/1.1/series/500055/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/list/?series=500055","date":"2026-04-15T23:52:00","name":"c++/reflection: null reflection in inform_tree_category","version":1,"mbox":"http://patchwork.ozlabs.org/series/500055/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2223672/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2223672/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=gKhhlUjD;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n s=mimecast20190719; t=1776297128;\n h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:mime-version:mime-version:content-type:content-type:\n content-transfer-encoding:content-transfer-encoding;\n bh=bjXr+AzgR1BLa4WC4xw5MrMURB5ZJmLM8GmDm00eKAo=;\n b=gKhhlUjD97Qhe2EsSwn/1P2UV76ccs4ReqSuWOulaebXbmAt6PUTD81/8UudSl2CjWgVbL\n Q5ooes91mRviqTvXJUqNY7q3A5XKefkUZDU3nBhJUBN2MEDCjYi9iCvfQlgfVvUKgMSkhQ\n 3XmJneAsHZCLA9oL7div01akQUAVYAg=","X-MC-Unique":"vvNOn--nOS65Ru81IcjRdQ-1","X-Mimecast-MFC-AGG-ID":"vvNOn--nOS65Ru81IcjRdQ_1776297126","From":"Marek Polacek ","To":"Jason Merrill ,\n\tGCC Patches ","Subject":"[PATCH] c++/reflection: null reflection in inform_tree_category","Date":"Wed, 15 Apr 2026 19:52:00 -0400","Message-ID":"<20260415235200.1576761-1-polacek@redhat.com>","MIME-Version":"1.0","X-Scanned-By":"MIMEDefang 3.4.1 on 10.30.177.93","X-Mimecast-Spam-Score":"0","X-Mimecast-MFC-PROC-ID":"kLwhUnwvhcTNFu9b0iq6Lv2h8xT3atAqUMzflPBkUf4_1776297126","X-Mimecast-Originator":"redhat.com","Content-Transfer-Encoding":"8bit","content-type":"text/plain; charset=\"US-ASCII\"; x-default=true","X-BeenThere":"gcc-patches@gcc.gnu.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Gcc-patches mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"},"content":"Tested reflect/* on x86_64-pc-linux-gnu, ok for trunk?\n\n-- >8 --\nHere we are printing:\n\n note: but ''lang_type' not supported by dump_expr' is a type\n\nbecause we represent a null reflection with unknown_type_node. Let's\nnot print anything in that case; unknown_type_node can also be\n.\n\ngcc/cp/ChangeLog:\n\n\t* error.cc (inform_tree_category): Don't print unknown_type_node.\n\ngcc/testsuite/ChangeLog:\n\n\t* g++.dg/reflect/null6.C: New test.\n---\n gcc/cp/error.cc | 2 +-\n gcc/testsuite/g++.dg/reflect/null6.C | 8 ++++++++\n 2 files changed, 9 insertions(+), 1 deletion(-)\n create mode 100644 gcc/testsuite/g++.dg/reflect/null6.C\n\n\nbase-commit: 77d4080e1e5f9d467816e2e2e878edbfbb7ee1c1","diff":"diff --git a/gcc/cp/error.cc b/gcc/cp/error.cc\nindex b3e66924e31..f0097bf6808 100644\n--- a/gcc/cp/error.cc\n+++ b/gcc/cp/error.cc\n@@ -3988,7 +3988,7 @@ inform_tree_category (tree t)\n if (TREE_CODE (t) == TYPE_DECL)\n t = TREE_TYPE (t);\n \n- if (TYPE_P (t))\n+ if (TYPE_P (t) && t != unknown_type_node)\n inform (loc, \"but %qE is a type\", t);\n else if (EXPR_P (t))\n inform (loc, \"but %qE is an expression\", t);\ndiff --git a/gcc/testsuite/g++.dg/reflect/null6.C b/gcc/testsuite/g++.dg/reflect/null6.C\nnew file mode 100644\nindex 00000000000..55bf15ef959\n--- /dev/null\n+++ b/gcc/testsuite/g++.dg/reflect/null6.C\n@@ -0,0 +1,8 @@\n+// { dg-do compile { target c++26 } }\n+// { dg-additional-options \"-freflection\" }\n+\n+using info = decltype(^^::);\n+constexpr auto null = info{};\n+constexpr auto q = [:null:]; // { dg-error \"expected a reflection of an expression\" }\n+// { dg-message \"add .typename.\" \"\" { target *-*-* } .-1 }\n+// { dg-bogus \"is a type\" \"\" { target *-*-* } .-2 }\n","prefixes":[]}