http://docs.racket-lang.org/reference/Filesystem.html?q=atomic#%28def._%28%28lib._racket%2Ffile..rkt%29._call-with-atomic-output-file%29%29
proc : ( [ port input-port? ] [ tmp-path path? ] . -> . any ) Should be proc : ( [ port out put-port? ] [ tmp-path path? ] . -> . any ) because in code it got result of open-output-dile -- Roman Klochkov
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