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Edit summary for version 18 :

Version 17

Version 18

Idiom #59 Write to standard error stream

Print the message "x is negative" to standard error (stderr), with integer x value substitution (e.g. "-2 is negative").

Idiom #59 Write to standard error stream

Print the message "x is negative" to standard error (stderr), with integer x value substitution (e.g. "-2 is negative").

Code
System.IO.hPutStrLn System.IO.stderr (show (x) ++ " is negative")