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-rw-r--r--doc/progs/interface.go2
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/progs/interface.go b/doc/progs/interface.go
index c2925d590..6972b7287 100644
--- a/doc/progs/interface.go
+++ b/doc/progs/interface.go
@@ -1,3 +1,5 @@
+// compile
+
// Copyright 2012 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.