copy-file[procedure] copy-file srcpath dstpath
MzScheme: copies file. fails if the destination
already exists.
[procedure] copy-file srcpath dstpath
STklos: copies file. if dstpath exists, it is overwritten.
[procedure] copy-file src dst &keyword if-exists backup-suffix safe keep-timestamp
Gauche: copies file. you can customize behavior by
keyword arguments. See also move-file.
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