Test Go 1.16beta1 (#2769)

* Set `GO111MODULE=off` in `go_info`
* Switched to Gazelle `v0.22.3` which also includes fixes.

Author: Jay Conrod

WORKSPACE

@@ -6,7 +6,7 @@ load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_depe
 
 go_rules_dependencies(is_rules_go = True)
 
-go_register_toolchains(version = "1.15.5")
+go_register_toolchains(version = "1.16beta1")
 
 http_archive(
     name = "com_google_protobuf",
@@ -78,10 +78,10 @@ bazel_skylib_workspace()
 
 http_archive(
     name = "bazel_gazelle",
-    sha256 = "b85f48fa105c4403326e9525ad2b2cc437babaa6e15a3fc0b1dbab0ab064bc7c",
+    sha256 = "222e49f034ca7a1d1231422cdb67066b885819885c356673cb1f72f748a3c9d4",
     urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.22.2/bazel-gazelle-v0.22.2.tar.gz",
-        "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.22.2/bazel-gazelle-v0.22.2.tar.gz",
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.22.3/bazel-gazelle-v0.22.3.tar.gz",
+        "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.22.3/bazel-gazelle-v0.22.3.tar.gz",
     ],
 )
 

go/tools/builders/info.go

@@ -38,6 +38,7 @@ func run(args []string) error {
 	if err := goenv.checkFlags(); err != nil {
 		return err
 	}
+	os.Setenv("GO111MODULE", "off")
 	f := os.Stderr
 	if filename != "" {
 		var err error