R=rsc
https://golang.org/cl/152128
both of type "int" (although you'd have to look at the "syscall" package
to see that). Finally, line 35 returns two values: a pointer to the new "File"
and the error. If "syscall.Open" fails, the file descriptor "r" will
-be negative and "NewFile" will return "nil".
+be negative and "newFile" will return "nil".
About those errors: The "os" library includes a general notion of an error.
It's a good idea to use its facility in your own interfaces, as we do here, for