1. What version of Go are you using (go version)?
   go version go1.6.1 darwin/amd64
2. What operating system and processor architecture are you using (go env)?
   GOARCH="amd64"
   GOOS="darwin"
3. What did you do?
   Returned filepath.SkipDir in a filepath.WalkFunc when the file was not a directory.
4. What did you expect to see?
   filepath.Walk would return nil
5. What did you see instead?
   filepath.Walk returned filepath.SkipDir

I don't know whether this is an issue with the documentation or implementation, but the behavior seems to contradict the documentation for filepath.WalkFunc.

If an error is returned, processing stops. The sole exception is when the function returns the special value SkipDir. If the function returns SkipDir when invoked on a directory, Walk skips the directory's contents entirely. If the function returns SkipDir when invoked on a non-directory file, Walk skips the remaining files in the containing directory.