foreach loop in constraint

typedef enum {LOW, MID1, MID2, HIGH} scale;
class seq_item;
  // Associative array indexed by the enum 'scale'
  rand bit [7:0] value_a[scale]; 
  rand bit [3:0] array[];

  // Constructor to pre-allocate keys for the associative array
  function new();
    value_a[LOW]  = 0;
    value_a[MID1] = 0;
    value_a[MID2] = 0;
    value_a[HIGH] = 0;
  endfunction

  // Constraint for the dynamic array size
  constraint arr_size_c { array.size() inside {[2:5]}; }
  
  // Constraint for the dynamic array values
  constraint array_c { foreach(array[i]) { array[i] > i*i; }  }

  // Constraint for the associative array values
  constraint value_a_c {
    foreach(value_a[i]) {
      value_a[i] < 100;
      (i == LOW)  -> value_a[i] < 30;
      (i == MID1) -> value_a[i] inside {[30:50]};
      (i == MID2) -> value_a[i] inside {[51:70]};
      (i == HIGH) -> value_a[i] > 70;
    }
  }
endclass

module constraint_example;
  seq_item item;
  
  initial begin
    item = new();
    
    repeat(5) begin
      item.randomize();
      foreach(item.value_a[i]) $display("value[%s] = %0d", i.name(), item.value_a[i]);
      foreach(item.array[i]) $display("array[%0d] = %0d", i, item.array[i]);
    end
  end
endmodule