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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