1 files changed, 31 insertions, 0 deletions
diff --git a/src/cmd/vet/testdata/assign/assign.go b/src/cmd/vet/testdata/assign/assign.go
new file mode 100644
index 0000000..112614e
--- /dev/null
+++ b/src/cmd/vet/testdata/assign/assign.go
@@ -0,0 +1,31 @@
+// Copyright 2013 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.
+
+// This file contains tests for the useless-assignment checker.
+
+package assign
+
+import "math/rand"
+
+type ST struct {
+	x int
+	l []int
+}
+
+func (s *ST) SetX(x int, ch chan int) {
+	// Accidental self-assignment; it should be "s.x = x"
+	x = x // ERROR "self-assignment of x to x"
+	// Another mistake
+	s.x = s.x // ERROR "self-assignment of s.x to s.x"
+
+	s.l[0] = s.l[0] // ERROR "self-assignment of s.l.0. to s.l.0."
+
+	// Bail on any potential side effects to avoid false positives
+	s.l[num()] = s.l[num()]
+	rng := rand.New(rand.NewSource(0))
+	s.l[rng.Intn(len(s.l))] = s.l[rng.Intn(len(s.l))]
+	s.l[<-ch] = s.l[<-ch]
+}
+
+func num() int { return 2 }