golfish, 89 bytes

Result

WA

Duration

959ms

Code [DL]

00000000  d0 e2 80 01 e1 07 10 d1  e2 ed 20 12 12 d7 d3 d4  |.......... .....|
00000010  80 20 12 d2 d5 01 e1 e2  ed 80 e2 c0 08 06 d1 00  |. ..............|
00000020  e1 80 e0 e0 81 ed ec e2  d1 d3 d5 d5 e2 80 c0 e3  |................|
00000030  07 11 e2 ed 00 20 01 12  12 e1 80 00 12 d2 d5 00  |..... ..........|
00000040  01 e1 e2 ed 20 80 e3 08  06 d1 10 ec c1 e1 80 ed  |.... ...........|
00000050  20 d0 c0 e1 06 d1 11 d1  ff                       | ........|
00000059

stdin

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stdout

                                       1
 

stderr

/root/golfish/golfish.rb:280: warning: constant ::Fixnum is deprecated
/root/golfish/golfish.rb:94:in `-': nil can't be coerced into Integer (TypeError)
	from /root/golfish/golfish.rb:94:in `block in exec!'
	from /root/golfish/golfish.rb:49:in `loop'
	from /root/golfish/golfish.rb:49:in `exec!'
	from /root/golfish/golfish.rb:299:in `<main>'

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffdd78be780 /* 9 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x5637b7ef1068 /* 9 vars */ <unfinished ...>
12    execve("/usr/local/ruby-2.6.3/bin/ruby", ["/usr/local/ruby-2.6.3/bin/ruby", "/root/golfish/golfish.rb", "/volume/CODE"], 0x5637b7ef1090 /* 9 vars */ <unfinished ...>
11    <... execve resumed> )            = 0
12    <... execve resumed> )            = 0
11    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=11, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
12    +++ exited with 1 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=1, si_utime=5, si_stime=5} ---
10    +++ exited with 1 +++