[cfe-dev] implicit int rule for c89

[Rong, Hongbo]

b.c:
int main() {
  a = 1;
  return a;
}

clang.exe -std=c89 b.c
b.c:2:3: error: use of undeclared identifier 'a'
  a = 1;
  ^
b.c:3:10: error: use of undeclared identifier 'a'
  return a;
         ^
2 errors generated.

For c89, why variable a is not made as an implicit int?

Thanks,
Hongbo

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