1  /* PR c/65179 */
       2  /* { dg-do compile } */
       3  /* { dg-options "-O -Wextra" } */
       4  
       5  enum E {
       6    A = 0 << 1,
       7    B = 1 << 1,
       8    C = -1 << 1, /* { dg-warning "10:left shift of negative value|not an integer constant" "" { target { c || { c++11 && c++17_down } } } } */
       9    /* { dg-error "left operand of shift expression" "shift" { target { c++11 && c++17_down } } .-1 } */
      10    D = 0 >> 1,
      11    E = 1 >> 1,
      12    F = -1 >> 1
      13  };
      14  
      15  int
      16  left (int x)
      17  {
      18    /* Warn for LSHIFT_EXPR.  */
      19    const int z = 0;
      20    const int o = 1;
      21    const int m = -1;
      22    int r = 0;
      23    r += z << x;
      24    r += o << x;
      25    r += m << x; /* { dg-warning "10:left shift of negative value" "" { target { c || { c++11 && c++17_down } } } } */
      26    r += 0 << x;
      27    r += 1 << x;
      28    r += -1 << x; /* { dg-warning "11:left shift of negative value" "" { target { c || { c++11 && c++17_down } } } } */
      29    r += -1U << x;
      30    return r;
      31  }
      32  
      33  int
      34  right (int x)
      35  {
      36    /* Shouldn't warn for RSHIFT_EXPR.  */
      37    const int z = 0;
      38    const int o = 1;
      39    const int m = -1;
      40    int r = 0;
      41    r += z >> x;
      42    r += o >> x;
      43    r += m >> x;
      44    r += 0 >> x;
      45    r += 1 >> x;
      46    r += -1 >> x;
      47    r += -1U >> x;
      48    return r;
      49  }