Don't mix 'any' and 'interface{}'. Fixes #2726.

Author: dkegel-fastly

src/os/types_unix.go

@@ -24,7 +24,6 @@ type fileStat struct {
 func (fs *fileStat) Size() int64        { return fs.size }
 func (fs *fileStat) Mode() FileMode     { return fs.mode }
 func (fs *fileStat) ModTime() time.Time { return fs.modTime }
-func (fs *fileStat) Sys() interface{}   { return &fs.sys }
 
 func sameFile(fs1, fs2 *fileStat) bool {
 	return fs1.sys.Dev == fs2.sys.Dev && fs1.sys.Ino == fs2.sys.Ino

src/os/types_unix_go_118.go

@@ -0,0 +1,10 @@
+//go:build (darwin && go1.18) || (linux && !baremetal && go1.18)
+// +build darwin,go1.18 linux,!baremetal,go1.18
+
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os
+
+func (fs *fileStat) Sys() interface{} { return &fs.sys }

src/os/types_unix_go_other.go

@@ -0,0 +1,10 @@
+//go:build (darwin && !go1.18) || (linux && !baremetal && !go1.18)
+// +build darwin,!go1.18 linux,!baremetal,!go1.18
+
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os
+
+func (fs *fileStat) Sys() interface{} { return &fs.sys }