gcc/testsuite/g++.dg/cpp0x/constexpr-condition.C

// { dg-do compile { target c++11 } }
// Core DR 948

constexpr int something() { return 3; }

int main() {
  if (constexpr long v = something()) {}
  if (static long v = something()) { } // { dg-error "'decl-specifier' invalid" }
}