Test return related errors
STDIN
return ERRN
return ERRNO
return ERRNO(
return ERRNO(2
return KILL(1)
return
return TRACE(10000000)
STDERR
[WARN]: 1:8: Expect return value
return ERRN
       ^
[WARN]: 3:14: Expect number
return ERRNO(
             ^
[WARN]: 4:15: Expect parenthesis
return ERRNO(2
              ^
[WARN]: 5:12: Unexpected token
return KILL(1)
           ^
[WARN]: 6:7: Expect return value
return
      ^
[WARN]: 7:-: Data carried by return motion exceeds 0xffff
return TRACE(10000000)
~~~~~~~~~~~~~~~~~~~~~~
[ERROR]: Found errors when assembling
