$ ocaml
        Objective Caml version 3.12.1
  _________________________
[| +   | |   Batteries   - |
 |_____|_|_________________|
  _________________________
 | -  Type '#help;;' | | + |]
 |___________________|_|___|


Loading syntax extensions...
    Camlp4 Parsing version 3.12.1

# (* i am just a comment. nobody cares about me. oh wait! *);;
# Error: Parse error: illegal begin of top_phrase
#

Error: Parse error: illegal begin of top_phrase

# (* Hello *) ;;
Error: Syntax error

# (* Hello *) 3 ;;
- : int = 3