C++ PATCH for c++/84429, ICE capturing VLA

[Jason Merrill]

We already handle stripping dereferences for non-VLA captures, just
need to do the same thing for VLAs in the case of a nested capture.

Tested x86_64-pc-linux-gnu, applying to trunk.

commit 95a82187a0986740f6357f74ba6d03814ba7fc1c
Author: Jason Merrill <ja...@redhat.com>
Date:   Sun Feb 18 23:57:57 2018 -0500

            PR c++/84429 - ICE capturing VLA.
    
            * lambda.c (build_capture_proxy): Handle reference refs.

diff --git a/gcc/cp/lambda.c b/gcc/cp/lambda.c
index 38500b13262..a0a80dfde5c 100644
--- a/gcc/cp/lambda.c
+++ b/gcc/cp/lambda.c
@@ -451,11 +451,12 @@ build_capture_proxy (tree member, tree init)
        {
          if (PACK_EXPANSION_P (init))
            init = PACK_EXPANSION_PATTERN (init);
-         if (INDIRECT_REF_P (init))
-           init = TREE_OPERAND (init, 0);
-         STRIP_NOPS (init);
        }
 
+      if (INDIRECT_REF_P (init))
+       init = TREE_OPERAND (init, 0);
+      STRIP_NOPS (init);
+
       gcc_assert (VAR_P (init) || TREE_CODE (init) == PARM_DECL);
       while (is_normal_capture_proxy (init))
        init = DECL_CAPTURED_VARIABLE (init);
diff --git a/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-vla1.C 
b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-vla1.C
new file mode 100644
index 00000000000..91498c4589a
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-vla1.C
@@ -0,0 +1,9 @@
+// PR c++/84429
+// { dg-do compile { target c++11 } }
+// { dg-options "" }
+
+void foo(int i)
+{
+  char x[i];
+  [&]{ [&]{ return x; }; };
+}