ON ERROR SKIP
<command 1>
<command 2>

option explicit
on error skip
controller nunchuk open 3
if mm.errorno<>0 then
  print "no nunchuk"
else
  print "ok"
endif
controller nunchuk close 3

option explicit
on error skip 1
?"Check error handling:"
if mm.errorno<>0 then  
  print "I should never arrive here!"
endif

Check error handling:
I should never arrive here!

Error in line 5: MM.ERRORNO is not declared

option explicit
on error skip 1
?"Check error handling:"
print mm.errorno

option explicit
on error skip 1
?"Check error handling:"
print mm.errorno

option explicit
on error skip 1
?"Check error handling:"
if mm.errorno<>0 then  
 print "I should never arrive here!"
endif

option explicit
on error skip 1
?"Check error handling:"
if mm.errorno<>0 then  
print "I should never arrive here!"
endif

> Micromite MKII MMBasic Ver 5.05.03
Copyright 2011-2020 Geoff Graham

> LIST
option explicit
on error skip 1
print "Check error handling:"
if mm.errorno<>0 then
 print "I should never arrive here!"
endif
>
> RUN
Check error handling:
[4] If mm.errorno<>0 Then
Error : MM.ERRORNO is not declared
>

if mm.errorno<>0 then

? mm.errorno

option explicit
1: on error skip 1
2: ?"Check error handling:"
3: print mm.errorno

option explicit
1: on error skip 1
2: ?"Check error handling:"
3: if mm.errorno<>0 then  
4:    print "I should never arrive here!"
5: endif

           nextstmt = cmdline = p + 1;
           skipspace(cmdline);
           skipelement(nextstmt);
           if(*p && *p != '\'') {                                  // ignore a comment line
               if(setjmp(ErrNext) == 0) {                          // return to the else leg of this if error and OPTION ERROR SKIP/IGNORE is in effect
                   SaveLocalIndex = LocalIndex;                    // save this if we need to cleanup after an error
                   if(*(char*)p >= C_BASETOKEN && *(char*)p - C_BASETOKEN < CommandTableSize - 1 && (commandtbl[*(char*)p - C_BASETOKEN].type & T_CMD)) {
                       cmdtoken = *(char*)p;
                       targ = T_CMD;
                       commandtbl[*(char*)p - C_BASETOKEN].fptr(); // execute the command
                   } else {
                       if(!isnamestart(*p)) error("Invalid character: @", (int)(*p));
                       i = FindSubFun(p, false);                   // it could be a defined command
                       if(i >= 0) {                                // >= 0 means it is a user defined command
                           DefinedSubFun(false, p, i, NULL, NULL, NULL, NULL);
                       }
                       else
                           error("Unknown command");
                   }
               } else {
                   LocalIndex = SaveLocalIndex;                    // restore so that we can clean up any memory leaks
                   ClearTempMemory();
               }
               if(OptionErrorSkip > 0) OptionErrorSkip--;          // if OPTION ERROR SKIP decrement the count - we do not error if it is greater than zero