Enforce two illegal import statements that were outlawed in the reference manual but not checked: Names bound by import statemants may not occur in global statements in the same scope. The from ... import * form may only occur in a module scope. I guess these changes could break code, but the reference manual warned about them. Several other small changes If a variable is declared global in the nearest enclosing scope of a free variable, then treat it is a global in the nested scope too. Get rid of com_mangle and symtable_mangle functions and call mangle directly. If errors occur during symtable table creation, return -1 from symtable_build(). Do not increment st_errors in assignment to lambda, because exception is not set. Add extra argument to symtable_assign(); the argument, flag, is ORed with DEF_LOCAL for each symtable_add_def() call.

/* PD implementation of strerror() for systems that don't have it.
   Author: Guido van Rossum, CWI Amsterdam, Oct. 1990, <guido@cwi.nl>. */

#include <stdio.h>

extern int sys_nerr;
extern char *sys_errlist[];

char *
strerror(int err)
{
	static char buf[20];
	if (err >= 0 && err < sys_nerr)
		return sys_errlist[err];
	sprintf(buf, "Unknown errno %d", err);
	return buf;
}

#ifdef macintosh
int sys_nerr = 0;
char *sys_errlist[1] = 0;
#endif