go/packages: temporarily disable some tests running on go tip with -race

A change in go/types has uncovered a race in go/packages. While we debug,
ignore those tests when running on tip with -race to make the builders
green. This change will be reverted as soon as the issue is fixed.

Updates golang/go#31749

Change-Id: I96f0b30a1bc203a5c36a2ce30c943583b7f8035a
Reviewed-on: https://go-review.googlesource.com/c/tools/+/200819
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>

go/analysis/multichecker/multichecker_race_test.go

@@ -0,0 +1,15 @@
+// Copyright 2019 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 race
+
+// This file exists to allow us to detect that we're in race detector mode for temporarily
+// disabling tests that are broken on tip with the race detector turned on.
+// TODO(matloob): delete this once golang.org/issue/31749 is fixed.
+
+package multichecker_test
+
+func init() {
+	race = true
+}

go/analysis/multichecker/multichecker_test.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"os/exec"
 	"runtime"
+	"strings"
 	"testing"
 
 	"golang.org/x/tools/go/analysis"
@@ -29,9 +30,15 @@ func main() {
 	multichecker.Main(findcall.Analyzer, fail)
 }
 
+var race = false
+
 // TestExitCode ensures that analysis failures are reported correctly.
 // This test fork/execs the main function above.
 func TestExitCode(t *testing.T) {
+	if v := runtime.Version(); strings.Contains(v, "devel") && race {
+		t.Skip("golang.org/issue/31749: This test is broken on tip in race mode. Skip until it's fixed.")
+	}
+
 	if runtime.GOOS != "linux" {
 		t.Skipf("skipping fork/exec test on this platform")
 	}

go/loader/loader_race_test.go

@@ -0,0 +1,15 @@
+// Copyright 2019 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 race
+
+// This file exists to allow us to detect that we're in race detector mode for temporarily
+// disabling tests that are broken on tip with the race detector turned on.
+// TODO(matloob): delete this once golang.org/issue/31749 is fixed.
+
+package loader_test
+
+func init() {
+	race = true
+}

go/loader/loader_test.go

@@ -262,7 +262,13 @@ func TestLoad_FromSource_Success(t *testing.T) {
 	}
 }
 
+var race = false
+
 func TestLoad_FromImports_Success(t *testing.T) {
+	if v := runtime.Version(); strings.Contains(v, "devel") && race {
+		t.Skip("golang.org/issue/31749: This test is broken on tip in race mode. Skip until it's fixed.")
+	}
+
 	if runtime.Compiler == "gccgo" {
 		t.Skip("gccgo has no standard library test files")
 	}

go/packages/packages_race_test.go

@@ -0,0 +1,15 @@
+// Copyright 2019 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 race
+
+// This file exists to allow us to detect that we're in race detector mode for temporarily
+// disabling tests that are broken on tip with the race detector turned on.
+// TODO(matloob): delete this once golang.org/issue/31749 is fixed.
+
+package packages_test
+
+func init() {
+	race = true
+}

go/packages/packages_test.go

@@ -2273,8 +2273,14 @@ const A = 4
 	}
 }
 
+var race = false
+
 func TestIssue32814(t *testing.T) { packagestest.TestAll(t, testIssue32814) }
 func testIssue32814(t *testing.T, exporter packagestest.Exporter) {
+	if v := runtime.Version(); strings.Contains(v, "devel") && race {
+		t.Skip("golang.org/issue/31749: This test is broken on tip in race mode. Skip until it's fixed.")
+	}
+
 	exported := packagestest.Export(t, exporter, []packagestest.Module{{
 		Name:  "golang.org/fake",
 		Files: map[string]interface{}{}}})

go/packages/stdlib_test.go

@@ -19,6 +19,10 @@ import (
 
 // This test loads the metadata for the standard library,
 func TestStdlibMetadata(t *testing.T) {
+	if v := runtime.Version(); strings.Contains(v, "devel") && race {
+		t.Skip("golang.org/issue/31749: This test is broken on tip in race mode. Skip until it's fixed.")
+	}
+
 	// TODO(adonovan): see if we can get away without this hack.
 	// if runtime.GOOS == "android" {
 	// 	t.Skipf("incomplete std lib on %s", runtime.GOOS)