[kazinator]

I wouldn't write a config file parsing library for C programs without interning, so == between two pointers could be used to test for keyword equality.

Interning is used outside of LIsp. See the XInternAtom function in the X Window system:

  Atom XInternAtom(
    Display *display,
    char *atom_name,
    Bool only_if_exists
  );
 

or RegisterClass in Win32:

  ATOM RegisterClassA(
    const WNDCLASSA *lpWndClass
  );

[reitzensteinm]

I wouldn't either :)