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ruby system command check exit code
...tevm --invalid-option")
$? #=> #<Process::Status: pid 9926 exit 2>
$?.exitstatus #=> 2
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edited Feb 12 at 12:39
Nikita
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Haskell error parse error on input `='
...r below, you need a let to define things in it.
Prelude> let f x = x * 2
Prelude> f 4
8
Starting from GHC 8.0.1, top-level bindings are supported in GHCi, so OP's code will work without change.
GHCi, version 8.0.1.20161213: http://www.haskell.org/ghc/ :? for help
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