C:\go\root\src\pkg\os>hg id
f3bac1f13638+

C:\go\root\src\pkg\os>hg diff
diff -r f3bac1f13638 src/pkg/os/os_windows_test.go
--- a/src/pkg/os/os_windows_test.go     Thu Aug 07 10:25:50 2014 +1000
+++ b/src/pkg/os/os_windows_test.go     Thu Aug 07 15:06:21 2014 +1000
@@ -4,7 +4,9 @@
        "io/ioutil"
        "os"
        "path/filepath"
+       "runtime"
        "syscall"
+       "testing"
 )

 func init() {
@@ -25,3 +27,58 @@
                supportsSymlinks = false
        }
 }
+
+func TestSameWindowsFile(t *testing.T) {
+       temp, err := ioutil.TempDir("", "TestSameWindowsFile")
+       if err != nil {
+               t.Fatal(err)
+       }
+       defer os.RemoveAll(temp)
+
+       wd, err := os.Getwd()
+       if err != nil {
+               t.Fatal(err)
+       }
+       err = os.Chdir(temp)
+       if err != nil {
+               t.Fatal(err)
+       }
+       defer os.Chdir(wd)
+
+       f, err := os.Create("a")
+       if err != nil {
+               t.Fatal(err)
+       }
+       f.Close()
+
+       ia1, err := os.Stat("a")
+       if err != nil {
+               t.Fatal(err)
+       }
+
+       path, err := filepath.Abs("a")
+       if err != nil {
+               t.Fatal(err)
+       }
+       ia2, err := os.Stat(path)
+       if err != nil {
+               t.Fatal(err)
+       }
+       if !os.SameFile(ia1, ia2) {
+               t.Errorf("files should be same")
+       }
+
+       if runtime.GOOS == "windows" {
+               p := filepath.VolumeName(path) + filepath.Base(path)
+               if err != nil {
+                       t.Fatal(err)
+               }
+               ia3, err := os.Stat(p)
+               if err != nil {
+                       t.Fatal(err)
+               }
+               if !os.SameFile(ia1, ia3) {
+                       t.Errorf("files should be same")
+               }
+       }
+}

C:\go\root\src\pkg\os>go test -run=SameWindowsFile
--- FAIL: TestSameWindowsFile (0.00s)
        os_windows_test.go:81: files should be same
FAIL
exit status 1
FAIL    os      0.094s

Alex