1 files changed, 13 insertions, 0 deletions
diff --git a/src/crypto/boring/notboring_test.go b/src/crypto/boring/notboring_test.go
new file mode 100644
index 0000000000..385a384dd7
--- /dev/null
+++ b/src/crypto/boring/notboring_test.go
@@ -0,0 +1,13 @@
+// Copyright 2020 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.
+
+// +build !boringcrypto
+
+package boring_test
+
+import "testing"
+
+func TestNotBoring(t *testing.T) {
+	t.Error("a file tagged !boringcrypto should not build under Go+BoringCrypto")
+}