[dev.typeparams] cmd/gofmt: remove typeparams guards

Remove logic related to guarding against allowing type parameters from
cmd/gofmt. At this point, it was only restricting tests.

Change-Id: Idd198389aaa422636d61af547a37be49f3be6c97
Reviewed-on: https://go-review.googlesource.com/c/go/+/329931
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

src/cmd/gofmt/doc.go

@@ -26,9 +26,6 @@ The flags are:
 		Do not print reformatted sources to standard output.
 		If a file's formatting is different from gofmt's, print its name
 		to standard output.
-	-G
-		Allow generic code, using type parameters.
-		See golang.org/issues/43651 for more information.
 	-r rule
 		Apply the rewrite rule to the source before reformatting.
 	-s

src/cmd/gofmt/gofmt_test.go

@@ -54,8 +54,6 @@ func gofmtFlags(filename string, maxLines int) string {
 	return ""
 }
 
-var typeParamsEnabled = false
-
 func runTest(t *testing.T, in, out string) {
 	// process flags
 	*simplifyAST = false
@@ -78,11 +76,6 @@ func runTest(t *testing.T, in, out string) {
 		case "-stdin":
 			// fake flag - pretend input is from stdin
 			stdin = true
-		case "-G":
-			// fake flag - test is for generic code
-			if !typeParamsEnabled {
-				return
-			}
 		default:
 			t.Errorf("unrecognized flag name: %s", name)
 		}

src/cmd/gofmt/gofmt_typeparams_test.go

@@ -1,12 +0,0 @@
-// Copyright 2021 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.
-
-//go:build typeparams
-// +build typeparams
-
-package main
-
-func init() {
-	typeParamsEnabled = true
-}

src/cmd/gofmt/testdata/typeparams.golden

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//gofmt -G
+//gofmt
 
 package typeparams
 

src/cmd/gofmt/testdata/typeparams.input

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//gofmt -G
+//gofmt
 
 package typeparams