For the following code in array-bounds.cpp

  unsigned int arr[2] = {0, 1};
  int i1 = arr[4];
  int i2 = (int)(arr[4]);
  int i3 = static_cast<int>(arr[4]);

Clang warns only for `i1`'s assignment. When the array item is casted, no out of bounds warning is presented.

  $ clang -cc1 -Warray-bounds array-bounds.cpp
  array-bounds.cpp:2:10: warning: array index 4 is past the end of the array 
  (which contains 2 elements)
  int i1 = arr[4];
           ^   ~
  array-bounds.cpp:1:1: note: array 'arr' declared here
  unsigned int arr[2] = {0, 1};
  ^
  1 warning generated.


This is not a duplicate of PR10771, as in the latter the subscript operator is applied on the casted array, whereas in this case, the subscript operator is applied first and then casting applied on the result.