E0002: a comment that is never closed

A comment opened with (* or /* runs until its matching *) or */. Comments nest (Ed.3 Table 3, features 3a and 3b), so every (* inside a comment needs its own *).

(* counts the boxes (* every scan *)
x := x + 1;       (* still inside the first comment: E0002 at its start *)

iecf reports the comment once, at its start, and stops reading the file there rather than guessing where it was meant to end.