Free Hero Mesh

          if(!macros) ParseError("Cannot edit nonexistent macro\n");
          nxttok();
          if(tokent==TF_INT) {
            if(!macstack) ParseError("Empty macro stack\n");
            n=tokenv-1;
            nxttok();
            if(n<0 || macstack->n<=n || !macstack->args[n]) ParseError("Cannot edit nonexistent argument %u\n",n+1);
            if(macstack->args[n]->t&(TF_MACRO|TF_EOF)) ParseError("Invalid edit token\n");
            if(macstack->args[n]->t&TF_OPEN) {
              free_macro(macstack->args[n]->next);
              macstack->args[n]->next=0;
            } else if(macstack->args[n]->t&TF_EOF) {
              ParseError("Invalid edit token\n");
            }
            free(macstack->args[n]->str);
            macstack->args[n]->t=tokent;
            macstack->args[n]->v=tokenv;
            macstack->args[n]->str=0;
            if(*tokenstr) {
              macstack->args[n]->str=strdup(tokenstr);
              if(!macstack->args[n]->str) fatal("Allocation failed\n");

  permitted to redefine existing macros as well as new ones.

{edit <string> <token>}
  Edit a macro. This changes the first token of the definition of the macro
  (which must not be another macro) to the specified token. The token is
  expanded, and must be a single token once it is expanded; that is what it
  will be replaced with. There is a variant with a number in place of a
  string; this will replace the argument of the macro which is currently
  being expanded.
  string; this will replace the first token of the argument of the macro
  which is currently being expanded (or the entire token if it starts with
  an opening delimiter).

{include <string>}
  Include text from another file into this one. You cannot use {include}
  inside of another macro or in a macro argument. The file must be in the
  current directory, and its name must contain only letters, digits, dot,
  underscore, and minus signs, and must start with a letter or digit. If
  it is a composite puzzle set, then the name must end with ".include",