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unlink($path) or die "unlink: $path: $!";
rename($oldpath,$newpath) or die "rename($oldpath,$newpath): $!";

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unlink($path) or die "unlink($path): $!";
warn "unlike($path) succeeded";

rename($oldpath,$newpath) or die "rename($oldpath,$newpath): $!";
warn "rename($oldpath,$newpath) succeeded";