Given

  char arr[100];
  sizeof(0,arr);

What does the sizeof expression return?  The comma operator is
supposed to return an lvalue if the second argument is an lvalue,
which I assume means that array-to-pointer conversion is not performed
either.  But in this case the sizeof expression would return a different
value than in plain C, and there is nothing in Annex C to indicate that
an incompatible change was intended.

-Sandra
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