Existing code that does "auto x = 3;" is already broken; the "implicit int" rule was removed in C99. But "auto int x = 3;" is valid (and the "auto" keyword is

Existing code that does "auto x = 3;" is already broken; the "implicit int" rule was removed in C99. But "auto int x = 3;" is valid (and the "auto" keyword is useless in that context).