File: pr63996.C

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gcc-arm-none-eabi 15%3A14.2.rel1-1
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// { dg-do compile { target c++14 } }
// { dg-additional-options "-Wno-return-type" }

constexpr int
foo (int i)
{
  int a[i] = { }; // { dg-error "7:ISO C\\+\\+ forbids variable length array .a" }
  if (i == 23) return 0;
}

constexpr int j = foo (1); // { dg-error "flows off the end|in .constexpr. expansion of" }