func (fs *fileStat) Mode() FileMode     { return fs.mode }
func (fs *fileStat) ModTime() time.Time { return fs.modTime }
func (fs *fileStat) Sys() any           { return fs.sys }

func sameFile(fs1, fs2 *fileStat) bool {
	a := fs1.sys.(*syscall.Dir)
	b := fs2.sys.(*syscall.Dir)
	return a.Qid.Path == b.Qid.Path && a.Type == b.Type && a.Dev == b.Dev

	return n < m || n == m && p.lico < q.lico
}

// SameFile reports whether p and q are positions in the same file.
func (p XPos) SameFile(q XPos) bool {
	return p.index == q.index
}

// SameFileAndLine reports whether p and q are positions on the same line in the same file.
func (p XPos) SameFileAndLine(q XPos) bool {
	return p.index == q.index && p.lico.SameLine(q.lico)
}

	bufp := copyBufPool.Get().(*[]byte)
	buf := *bufp
	defer copyBufPool.Put(bufp)

	return io.CopyBuffer(dst, src, buf)
}

// SameFile returns if the files are same.
func SameFile(fi1, fi2 os.FileInfo) bool {
	if !os.SameFile(fi1, fi2) {
		return false
	}
	if !fi1.ModTime().Equal(fi2.ModTime()) {
		return false
	}
	if fi1.Mode() != fi2.Mode() {
		return false
	}

	if err != nil {
		t.Fatalf("Error Stat(): %v", err)
	}
	if !SameFile(fi1, fi2) {
		t.Fatal("Expected the files to be same")
	}
	if err = os.WriteFile(tmpFile, []byte("aaa"), 0o644); err != nil {
		t.Fatal(err)
	}
	fi2, err = os.Stat(tmpFile)
	if err != nil {
		t.Fatalf("Error Stat(): %v", err)
	}
	if SameFile(fi1, fi2) {
		t.Fatal("Expected the files not to be same")
	}
}

				}
				info, err := n.Info()
				if err != nil {
					t.Errorf("%s: Info: %v", m, err)
					continue
				}
				if !SameFile(info, lstat) {
					t.Errorf("%s: Info: SameFile(info, lstat) = false", m)
				}
			}
			if !found {
				t.Error("could not find", m)
			}
		}
		if s == nil {
			t.Error("ReadDir returned nil instead of empty slice")
		}

	if err != nil {
		t.Fatalf("testenv.GoTool(): %v", err)
	}
	t.Logf("testenv.GoTool() = %q", goTool)

	gotInfo, err := os.Stat(goTool)
	if err != nil {
		t.Fatal(err)
	}
	if !os.SameFile(wantInfo, gotInfo) {
		t.Fatalf("%q is not the same file as %q", absWant, goTool)
	}
}

func TestHasGoBuild(t *testing.T) {
	if !testenv.HasGoBuild() {
		switch runtime.GOOS {
		case "js", "wasip1":

				// out that the explicit one doesn't match.
				dotfi, dotfiErr := os.Lstat(dotf)
				fi, fiErr := os.Lstat(f)
				if dotfiErr != nil || fiErr != nil || !os.SameFile(dotfi, fi) {
					return dotf, dotErr
				}
			}

			if !filepath.IsAbs(f) {
				if execerrdot.Value() != "0" {
					// If this is the same relative path that we already found,

	// on the original target path.
	dstInfo, err := os.Stat(dstAbs)
	if err != nil {
		log.Fatal(err)
	}
	targetInfo, err := os.Stat(targetPath)
	if err != nil {
		log.Fatal(err)
	}
	if !os.SameFile(dstInfo, targetInfo) {
		log.Fatalf("link destination (%s) is not the same file as %s", dstAbs, targetPath)
	}

	// Output:
	// hello.link links to hello.txt
}

func ExampleUserCacheDir() {

func errprintf(format string, args ...interface{}) {
	fmt.Fprintf(os.Stderr, format, args...)
}

// xsamefile reports whether f1 and f2 are the same file (or dir).
func xsamefile(f1, f2 string) bool {
	fi1, err1 := os.Stat(f1)
	fi2, err2 := os.Stat(f2)
	if err1 != nil || err2 != nil {
		return f1 == f2
	}
	return os.SameFile(fi1, fi2)
}

func xgetgoarm() string {

		}
		m[k] = v
	}

	for key, expected := range expectedMap {
		got := m[key]
		if key == "cwd" {
			// For Windows. golang.org/issue/4645.
			fi1, _ := os.Stat(got)
			fi2, _ := os.Stat(expected)
			if os.SameFile(fi1, fi2) {
				got = expected
			}
		}
		if got != expected {
			t.Errorf("for key %q got %q; expected %q", key, got, expected)
		}
	}
	for _, check := range checks {
		check(m)
	}
}