cmd/vet: make vet_test module-agnostic

vet_test currently uses a custom GOPATH for each test, but it turns
out not to be necessary.

Updates #30228

Change-Id: Id7a7bf6d759bd94adccf44e197be1728c2f23575
Reviewed-on: https://go-review.googlesource.com/c/163038
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/cmd/vet/testdata/deadcode/deadcode.go b/src/cmd/vet/testdata/deadcode/deadcode.go
new file mode 100644
index 0000000000..af83cdfbb1
--- /dev/null
+++ b/src/cmd/vet/testdata/deadcode/deadcode.go
@@ -0,0 +1,14 @@
+// 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 dead code checker.
+
+package deadcode
+
+func _() int {
+	print(1)
+	return 2
+	println() // ERROR "unreachable code"
+	return 3
+}