[gcc/devel/ranger] Add testcase of PR c++/89404, already fixed in trunk.

[Aldy Hernandez]

https://gcc.gnu.org/g:c58e6cc32c4e36032701e3bc5caa136a35231b5d

commit c58e6cc32c4e36032701e3bc5caa136a35231b5d
Author: Paolo Carlini <paolo.carlini@oracle.com>
Date:   Fri Feb 7 11:05:30 2020 +0100

    Add testcase of PR c++/89404, already fixed in trunk.
    
            PR c++/89404
            * g++.dg/ext/vla21.C: New.

Diff:
---
 gcc/testsuite/ChangeLog          | 5 +++++
 gcc/testsuite/g++.dg/ext/vla21.C | 8 ++++++++
 2 files changed, 13 insertions(+)

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 32aa39c02a4..bec80b2a94f 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2020-02-07  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/89404
+	* g++.dg/ext/vla21.C: New.
+
 2020-02-07  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/93615
diff --git a/gcc/testsuite/g++.dg/ext/vla21.C b/gcc/testsuite/g++.dg/ext/vla21.C
new file mode 100644
index 00000000000..0923cef2ae7
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/vla21.C
@@ -0,0 +1,8 @@
+// PR c++/89404
+// { dg-additional-options "-Wno-vla" }
+
+void
+foo (int n)
+{
+  struct {} a[1][n] (+a[0]);  // { dg-error "initialized" }
+}