A more unpleasant variant of this would be to combine `#define i j` with a language like Fortran 77 where variables are implicitly typed by letter. e.g. `#defin

A more unpleasant variant of this would be to combine `#define i j` with a language like Fortran 77 where variables are implicitly typed by letter. e.g. `#define i x` would change the implicit type from int to float...