add comment about why valid

From-SVN: r256071

add comment about why valid
From-SVN: r256071
5344af27 · Nathan Sidwell · e8e3054e · 5344af27
Commit 5344af27 authored Jan 02, 2018 by Nathan Sidwell
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gcc/testsuite/g++.dg/cpp0x/constexpr-64462.C
+1 -0

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--- a/gcc/testsuite/g++.dg/cpp0x/constexpr-64462.C
+++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-64462.C
@@ -6,5 +6,6 @@ int z;
 int main() {
  constexpr int& y = x;
+  // OK, 'y' is not ODR used
  [] { z = y; }();
 }