go.mod: upgrade golang.org/x/tools to v0.2.0

This fixes the failure in apidiff, so remove the test skip.

We also need to explicitly add a "go" line in the synthesized
go.mod for the test module.

Fixes golang/go#56162.

Change-Id: Iae320af89eeca11f69bea1b0dfa86f342911973f
Reviewed-on: https://go-review.googlesource.com/c/exp/+/445576
Run-TryBot: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

apidiff/apidiff_test.go

@@ -17,7 +17,6 @@ import (
 )
 
 func TestChanges(t *testing.T) {
-	t.Skip("broken by go1.20-pre3 compiler: see https://go.dev/issue/56162")
 	dir, err := os.MkdirTemp("", "apidiff_test")
 	if err != nil {
 		t.Fatal(err)
@@ -63,7 +62,7 @@ func splitIntoPackages(t *testing.T, dir string) (incompatibles, compatibles []s
 	if err := os.MkdirAll(filepath.Join(dir, "src", "apidiff"), 0700); err != nil {
 		t.Fatal(err)
 	}
-	if err := os.WriteFile(filepath.Join(dir, "src", "apidiff", "go.mod"), []byte("module apidiff\n"), 0666); err != nil {
+	if err := os.WriteFile(filepath.Join(dir, "src", "apidiff", "go.mod"), []byte("module apidiff\ngo 1.18\n"), 0666); err != nil {
 		t.Fatal(err)
 	}
 

go.mod

@@ -4,8 +4,8 @@ go 1.18
 
 require (
 	github.com/google/go-cmp v0.5.8
-	golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4
-	golang.org/x/tools v0.1.12
+	golang.org/x/mod v0.6.0
+	golang.org/x/tools v0.2.0
 )
 
-require golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f // indirect
+require golang.org/x/sys v0.1.0 // indirect

go.sum

@@ -2,7 +2,13 @@ github.com/google/go-cmp v0.5.8 h1:e6P7q2lk1O+qJJb4BtCQXlK8vWEO8V1ZeuEdJNOqZyg=
 github.com/google/go-cmp v0.5.8/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 h1:6zppjxzCulZykYSLyVDYbneBfbaBIQPYMevg0bEwv2s=
 golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.6.0 h1:b9gGHsz9/HhJ3HF5DHQytPpuwocVTChQJK3AvoLRD5I=
+golang.org/x/mod v0.6.0/go.mod h1:4mET923SAdbXp2ki8ey+zGs1SLqsuM2Y0uvdZR/fUNI=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f h1:v4INt8xihDGvnrfjMDVXGxw9wrfxYyCjk0KbXjhR55s=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.1.0 h1:kunALQeHf1/185U1i0GOB/fy1IPRDDpuoOOqRReG57U=
+golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/tools v0.1.12 h1:VveCTK38A2rkS8ZqFY25HIDFscX5X9OoEhJd3quQmXU=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.2.0 h1:G6AHpWxTMGY1KyEYoAQ5WTtIekUUvDNjan3ugu60JvE=
+golang.org/x/tools v0.2.0/go.mod h1:y4OqIKeOV/fWJetJ8bXPU1sEVniLMIyDAZWeHdV+NTA=