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 typedef int (*builtin_handler) (Sic *sic,
                                int argc, char *const argv[]);
typedef struct {
  const char *name;
  builtin_handler func;
  int min, max;
} Builtin;
typedef struct builtintab BuiltinTab;
extern Builtin *builtin_find (Sic *sic, const char *name);
extern int builtin_install   (Sic *sic, Builtin *table);
extern int builtin_remove    (Sic *sic, Builtin *table);
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