I don't understand the logic behind having END mid-stream in code like this, but the END command won't prevent any code following it from being compiled. It generates code to enter a continuous loop executing the SLEEP command.

If you don't include a GOTO before END, and program execution lands on the END statement, then you're trapped in a continuous loop similar to the one shown below.

@@0000 sleep
clrf PCLATH
goto @@0000

This (shown below) should work as-is since program execution should never land on END, but I still don't see the logic in placing it mid-stream like this!

GoTo main
End
int_routine: