From 73df946d56c74384511a194dd01dbe099584fd1a Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 28 Apr 2024 15:14:23 +0200
Subject: Adding upstream version 1.16.10.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/cmd/gofmt/testdata/comments.golden   |   9 ++
 src/cmd/gofmt/testdata/comments.input    |   9 ++
 src/cmd/gofmt/testdata/composites.golden | 218 +++++++++++++++++++++++++++++++
 src/cmd/gofmt/testdata/composites.input  | 218 +++++++++++++++++++++++++++++++
 src/cmd/gofmt/testdata/crlf.golden       |  13 ++
 src/cmd/gofmt/testdata/crlf.input        |  13 ++
 src/cmd/gofmt/testdata/emptydecl.golden  |  14 ++
 src/cmd/gofmt/testdata/emptydecl.input   |  16 +++
 src/cmd/gofmt/testdata/go2numbers.golden | 186 ++++++++++++++++++++++++++
 src/cmd/gofmt/testdata/go2numbers.input  | 186 ++++++++++++++++++++++++++
 src/cmd/gofmt/testdata/import.golden     | 194 +++++++++++++++++++++++++++
 src/cmd/gofmt/testdata/import.input      | 199 ++++++++++++++++++++++++++++
 src/cmd/gofmt/testdata/issue28082.golden |  13 ++
 src/cmd/gofmt/testdata/issue28082.input  |  13 ++
 src/cmd/gofmt/testdata/ranges.golden     |  30 +++++
 src/cmd/gofmt/testdata/ranges.input      |  20 +++
 src/cmd/gofmt/testdata/rewrite1.golden   |  14 ++
 src/cmd/gofmt/testdata/rewrite1.input    |  14 ++
 src/cmd/gofmt/testdata/rewrite10.golden  |  19 +++
 src/cmd/gofmt/testdata/rewrite10.input   |  19 +++
 src/cmd/gofmt/testdata/rewrite2.golden   |  12 ++
 src/cmd/gofmt/testdata/rewrite2.input    |  12 ++
 src/cmd/gofmt/testdata/rewrite3.golden   |  14 ++
 src/cmd/gofmt/testdata/rewrite3.input    |  14 ++
 src/cmd/gofmt/testdata/rewrite4.golden   |  76 +++++++++++
 src/cmd/gofmt/testdata/rewrite4.input    |  76 +++++++++++
 src/cmd/gofmt/testdata/rewrite5.golden   |  17 +++
 src/cmd/gofmt/testdata/rewrite5.input    |  17 +++
 src/cmd/gofmt/testdata/rewrite6.golden   |  17 +++
 src/cmd/gofmt/testdata/rewrite6.input    |  17 +++
 src/cmd/gofmt/testdata/rewrite7.golden   |  17 +++
 src/cmd/gofmt/testdata/rewrite7.input    |  17 +++
 src/cmd/gofmt/testdata/rewrite8.golden   |  12 ++
 src/cmd/gofmt/testdata/rewrite8.input    |  12 ++
 src/cmd/gofmt/testdata/rewrite9.golden   |  11 ++
 src/cmd/gofmt/testdata/rewrite9.input    |  11 ++
 src/cmd/gofmt/testdata/slices1.golden    |  66 ++++++++++
 src/cmd/gofmt/testdata/slices1.input     |  66 ++++++++++
 src/cmd/gofmt/testdata/stdin1.golden     |   5 +
 src/cmd/gofmt/testdata/stdin1.input      |   5 +
 src/cmd/gofmt/testdata/stdin2.golden     |  11 ++
 src/cmd/gofmt/testdata/stdin2.input      |  11 ++
 src/cmd/gofmt/testdata/stdin3.golden     |   7 +
 src/cmd/gofmt/testdata/stdin3.input      |   5 +
 src/cmd/gofmt/testdata/stdin4.golden     |   5 +
 src/cmd/gofmt/testdata/stdin4.input      |   5 +
 src/cmd/gofmt/testdata/stdin5.golden     |   3 +
 src/cmd/gofmt/testdata/stdin5.input      |   3 +
 src/cmd/gofmt/testdata/stdin6.golden     |  19 +++
 src/cmd/gofmt/testdata/stdin6.input      |  21 +++
 src/cmd/gofmt/testdata/stdin7.golden     |  19 +++
 src/cmd/gofmt/testdata/stdin7.input      |  21 +++
 src/cmd/gofmt/testdata/typealias.golden  |  24 ++++
 src/cmd/gofmt/testdata/typealias.input   |  24 ++++
 src/cmd/gofmt/testdata/typeswitch.golden |  60 +++++++++
 src/cmd/gofmt/testdata/typeswitch.input  |  60 +++++++++
 56 files changed, 2209 insertions(+)
 create mode 100644 src/cmd/gofmt/testdata/comments.golden
 create mode 100644 src/cmd/gofmt/testdata/comments.input
 create mode 100644 src/cmd/gofmt/testdata/composites.golden
 create mode 100644 src/cmd/gofmt/testdata/composites.input
 create mode 100644 src/cmd/gofmt/testdata/crlf.golden
 create mode 100644 src/cmd/gofmt/testdata/crlf.input
 create mode 100644 src/cmd/gofmt/testdata/emptydecl.golden
 create mode 100644 src/cmd/gofmt/testdata/emptydecl.input
 create mode 100644 src/cmd/gofmt/testdata/go2numbers.golden
 create mode 100644 src/cmd/gofmt/testdata/go2numbers.input
 create mode 100644 src/cmd/gofmt/testdata/import.golden
 create mode 100644 src/cmd/gofmt/testdata/import.input
 create mode 100644 src/cmd/gofmt/testdata/issue28082.golden
 create mode 100644 src/cmd/gofmt/testdata/issue28082.input
 create mode 100644 src/cmd/gofmt/testdata/ranges.golden
 create mode 100644 src/cmd/gofmt/testdata/ranges.input
 create mode 100644 src/cmd/gofmt/testdata/rewrite1.golden
 create mode 100644 src/cmd/gofmt/testdata/rewrite1.input
 create mode 100644 src/cmd/gofmt/testdata/rewrite10.golden
 create mode 100644 src/cmd/gofmt/testdata/rewrite10.input
 create mode 100644 src/cmd/gofmt/testdata/rewrite2.golden
 create mode 100644 src/cmd/gofmt/testdata/rewrite2.input
 create mode 100644 src/cmd/gofmt/testdata/rewrite3.golden
 create mode 100644 src/cmd/gofmt/testdata/rewrite3.input
 create mode 100644 src/cmd/gofmt/testdata/rewrite4.golden
 create mode 100644 src/cmd/gofmt/testdata/rewrite4.input
 create mode 100644 src/cmd/gofmt/testdata/rewrite5.golden
 create mode 100644 src/cmd/gofmt/testdata/rewrite5.input
 create mode 100644 src/cmd/gofmt/testdata/rewrite6.golden
 create mode 100644 src/cmd/gofmt/testdata/rewrite6.input
 create mode 100644 src/cmd/gofmt/testdata/rewrite7.golden
 create mode 100644 src/cmd/gofmt/testdata/rewrite7.input
 create mode 100644 src/cmd/gofmt/testdata/rewrite8.golden
 create mode 100644 src/cmd/gofmt/testdata/rewrite8.input
 create mode 100644 src/cmd/gofmt/testdata/rewrite9.golden
 create mode 100644 src/cmd/gofmt/testdata/rewrite9.input
 create mode 100644 src/cmd/gofmt/testdata/slices1.golden
 create mode 100644 src/cmd/gofmt/testdata/slices1.input
 create mode 100644 src/cmd/gofmt/testdata/stdin1.golden
 create mode 100644 src/cmd/gofmt/testdata/stdin1.input
 create mode 100644 src/cmd/gofmt/testdata/stdin2.golden
 create mode 100644 src/cmd/gofmt/testdata/stdin2.input
 create mode 100644 src/cmd/gofmt/testdata/stdin3.golden
 create mode 100644 src/cmd/gofmt/testdata/stdin3.input
 create mode 100644 src/cmd/gofmt/testdata/stdin4.golden
 create mode 100644 src/cmd/gofmt/testdata/stdin4.input
 create mode 100644 src/cmd/gofmt/testdata/stdin5.golden
 create mode 100644 src/cmd/gofmt/testdata/stdin5.input
 create mode 100644 src/cmd/gofmt/testdata/stdin6.golden
 create mode 100644 src/cmd/gofmt/testdata/stdin6.input
 create mode 100644 src/cmd/gofmt/testdata/stdin7.golden
 create mode 100644 src/cmd/gofmt/testdata/stdin7.input
 create mode 100644 src/cmd/gofmt/testdata/typealias.golden
 create mode 100644 src/cmd/gofmt/testdata/typealias.input
 create mode 100644 src/cmd/gofmt/testdata/typeswitch.golden
 create mode 100644 src/cmd/gofmt/testdata/typeswitch.input

(limited to 'src/cmd/gofmt/testdata')

diff --git a/src/cmd/gofmt/testdata/comments.golden b/src/cmd/gofmt/testdata/comments.golden
new file mode 100644
index 0000000..ad6bcaf
--- /dev/null
+++ b/src/cmd/gofmt/testdata/comments.golden
@@ -0,0 +1,9 @@
+package main
+
+func main() {}
+
+// comment here
+
+func f() {}
+
+//line foo.go:1
diff --git a/src/cmd/gofmt/testdata/comments.input b/src/cmd/gofmt/testdata/comments.input
new file mode 100644
index 0000000..ad6bcaf
--- /dev/null
+++ b/src/cmd/gofmt/testdata/comments.input
@@ -0,0 +1,9 @@
+package main
+
+func main() {}
+
+// comment here
+
+func f() {}
+
+//line foo.go:1
diff --git a/src/cmd/gofmt/testdata/composites.golden b/src/cmd/gofmt/testdata/composites.golden
new file mode 100644
index 0000000..a06a69d
--- /dev/null
+++ b/src/cmd/gofmt/testdata/composites.golden
@@ -0,0 +1,218 @@
+//gofmt -s
+
+package P
+
+type T struct {
+	x, y int
+}
+
+type T2 struct {
+	w, z int
+}
+
+var _ = [42]T{
+	{},
+	{1, 2},
+	{3, 4},
+}
+
+var _ = [...]T{
+	{},
+	{1, 2},
+	{3, 4},
+}
+
+var _ = []T{
+	{},
+	{1, 2},
+	{3, 4},
+}
+
+var _ = []T{
+	{},
+	10: {1, 2},
+	20: {3, 4},
+}
+
+var _ = []struct {
+	x, y int
+}{
+	{},
+	10: {1, 2},
+	20: {3, 4},
+}
+
+var _ = []interface{}{
+	T{},
+	10: T{1, 2},
+	20: T{3, 4},
+}
+
+var _ = [][]int{
+	{},
+	{1, 2},
+	{3, 4},
+}
+
+var _ = [][]int{
+	([]int{}),
+	([]int{1, 2}),
+	{3, 4},
+}
+
+var _ = [][][]int{
+	{},
+	{
+		{},
+		{0, 1, 2, 3},
+		{4, 5},
+	},
+}
+
+var _ = map[string]T{
+	"foo": {},
+	"bar": {1, 2},
+	"bal": {3, 4},
+}
+
+var _ = map[string]struct {
+	x, y int
+}{
+	"foo": {},
+	"bar": {1, 2},
+	"bal": {3, 4},
+}
+
+var _ = map[string]interface{}{
+	"foo": T{},
+	"bar": T{1, 2},
+	"bal": T{3, 4},
+}
+
+var _ = map[string][]int{
+	"foo": {},
+	"bar": {1, 2},
+	"bal": {3, 4},
+}
+
+var _ = map[string][]int{
+	"foo": ([]int{}),
+	"bar": ([]int{1, 2}),
+	"bal": {3, 4},
+}
+
+// from exp/4s/data.go
+var pieces4 = []Piece{
+	{0, 0, Point{4, 1}, []Point{{0, 0}, {1, 0}, {1, 0}, {1, 0}}, nil, nil},
+	{1, 0, Point{1, 4}, []Point{{0, 0}, {0, 1}, {0, 1}, {0, 1}}, nil, nil},
+	{2, 0, Point{4, 1}, []Point{{0, 0}, {1, 0}, {1, 0}, {1, 0}}, nil, nil},
+	{3, 0, Point{1, 4}, []Point{{0, 0}, {0, 1}, {0, 1}, {0, 1}}, nil, nil},
+}
+
+var _ = [42]*T{
+	{},
+	{1, 2},
+	{3, 4},
+}
+
+var _ = [...]*T{
+	{},
+	{1, 2},
+	{3, 4},
+}
+
+var _ = []*T{
+	{},
+	{1, 2},
+	{3, 4},
+}
+
+var _ = []*T{
+	{},
+	10: {1, 2},
+	20: {3, 4},
+}
+
+var _ = []*struct {
+	x, y int
+}{
+	{},
+	10: {1, 2},
+	20: {3, 4},
+}
+
+var _ = []interface{}{
+	&T{},
+	10: &T{1, 2},
+	20: &T{3, 4},
+}
+
+var _ = []*[]int{
+	{},
+	{1, 2},
+	{3, 4},
+}
+
+var _ = []*[]int{
+	(&[]int{}),
+	(&[]int{1, 2}),
+	{3, 4},
+}
+
+var _ = []*[]*[]int{
+	{},
+	{
+		{},
+		{0, 1, 2, 3},
+		{4, 5},
+	},
+}
+
+var _ = map[string]*T{
+	"foo": {},
+	"bar": {1, 2},
+	"bal": {3, 4},
+}
+
+var _ = map[string]*struct {
+	x, y int
+}{
+	"foo": {},
+	"bar": {1, 2},
+	"bal": {3, 4},
+}
+
+var _ = map[string]interface{}{
+	"foo": &T{},
+	"bar": &T{1, 2},
+	"bal": &T{3, 4},
+}
+
+var _ = map[string]*[]int{
+	"foo": {},
+	"bar": {1, 2},
+	"bal": {3, 4},
+}
+
+var _ = map[string]*[]int{
+	"foo": (&[]int{}),
+	"bar": (&[]int{1, 2}),
+	"bal": {3, 4},
+}
+
+var pieces4 = []*Piece{
+	{0, 0, Point{4, 1}, []Point{{0, 0}, {1, 0}, {1, 0}, {1, 0}}, nil, nil},
+	{1, 0, Point{1, 4}, []Point{{0, 0}, {0, 1}, {0, 1}, {0, 1}}, nil, nil},
+	{2, 0, Point{4, 1}, []Point{{0, 0}, {1, 0}, {1, 0}, {1, 0}}, nil, nil},
+	{3, 0, Point{1, 4}, []Point{{0, 0}, {0, 1}, {0, 1}, {0, 1}}, nil, nil},
+}
+
+var _ = map[T]T2{
+	{1, 2}: {3, 4},
+	{5, 6}: {7, 8},
+}
+
+var _ = map[*T]*T2{
+	{1, 2}: {3, 4},
+	{5, 6}: {7, 8},
+}
diff --git a/src/cmd/gofmt/testdata/composites.input b/src/cmd/gofmt/testdata/composites.input
new file mode 100644
index 0000000..9d28ac7
--- /dev/null
+++ b/src/cmd/gofmt/testdata/composites.input
@@ -0,0 +1,218 @@
+//gofmt -s
+
+package P
+
+type T struct {
+	x, y int
+}
+
+type T2 struct {
+	w, z int
+}
+
+var _ = [42]T{
+	T{},
+	T{1, 2},
+	T{3, 4},
+}
+
+var _ = [...]T{
+	T{},
+	T{1, 2},
+	T{3, 4},
+}
+
+var _ = []T{
+	T{},
+	T{1, 2},
+	T{3, 4},
+}
+
+var _ = []T{
+	T{},
+	10: T{1, 2},
+	20: T{3, 4},
+}
+
+var _ = []struct {
+	x, y int
+}{
+	struct{ x, y int }{},
+	10: struct{ x, y int }{1, 2},
+	20: struct{ x, y int }{3, 4},
+}
+
+var _ = []interface{}{
+	T{},
+	10: T{1, 2},
+	20: T{3, 4},
+}
+
+var _ = [][]int{
+	[]int{},
+	[]int{1, 2},
+	[]int{3, 4},
+}
+
+var _ = [][]int{
+	([]int{}),
+	([]int{1, 2}),
+	[]int{3, 4},
+}
+
+var _ = [][][]int{
+	[][]int{},
+	[][]int{
+		[]int{},
+		[]int{0, 1, 2, 3},
+		[]int{4, 5},
+	},
+}
+
+var _ = map[string]T{
+	"foo": T{},
+	"bar": T{1, 2},
+	"bal": T{3, 4},
+}
+
+var _ = map[string]struct {
+	x, y int
+}{
+	"foo": struct{ x, y int }{},
+	"bar": struct{ x, y int }{1, 2},
+	"bal": struct{ x, y int }{3, 4},
+}
+
+var _ = map[string]interface{}{
+	"foo": T{},
+	"bar": T{1, 2},
+	"bal": T{3, 4},
+}
+
+var _ = map[string][]int{
+	"foo": []int{},
+	"bar": []int{1, 2},
+	"bal": []int{3, 4},
+}
+
+var _ = map[string][]int{
+	"foo": ([]int{}),
+	"bar": ([]int{1, 2}),
+	"bal": []int{3, 4},
+}
+
+// from exp/4s/data.go
+var pieces4 = []Piece{
+	Piece{0, 0, Point{4, 1}, []Point{Point{0, 0}, Point{1, 0}, Point{1, 0}, Point{1, 0}}, nil, nil},
+	Piece{1, 0, Point{1, 4}, []Point{Point{0, 0}, Point{0, 1}, Point{0, 1}, Point{0, 1}}, nil, nil},
+	Piece{2, 0, Point{4, 1}, []Point{Point{0, 0}, Point{1, 0}, Point{1, 0}, Point{1, 0}}, nil, nil},
+	Piece{3, 0, Point{1, 4}, []Point{Point{0, 0}, Point{0, 1}, Point{0, 1}, Point{0, 1}}, nil, nil},
+}
+
+var _ = [42]*T{
+	&T{},
+	&T{1, 2},
+	&T{3, 4},
+}
+
+var _ = [...]*T{
+	&T{},
+	&T{1, 2},
+	&T{3, 4},
+}
+
+var _ = []*T{
+	&T{},
+	&T{1, 2},
+	&T{3, 4},
+}
+
+var _ = []*T{
+	&T{},
+	10: &T{1, 2},
+	20: &T{3, 4},
+}
+
+var _ = []*struct {
+	x, y int
+}{
+	&struct{ x, y int }{},
+	10: &struct{ x, y int }{1, 2},
+	20: &struct{ x, y int }{3, 4},
+}
+
+var _ = []interface{}{
+	&T{},
+	10: &T{1, 2},
+	20: &T{3, 4},
+}
+
+var _ = []*[]int{
+	&[]int{},
+	&[]int{1, 2},
+	&[]int{3, 4},
+}
+
+var _ = []*[]int{
+	(&[]int{}),
+	(&[]int{1, 2}),
+	&[]int{3, 4},
+}
+
+var _ = []*[]*[]int{
+	&[]*[]int{},
+	&[]*[]int{
+		&[]int{},
+		&[]int{0, 1, 2, 3},
+		&[]int{4, 5},
+	},
+}
+
+var _ = map[string]*T{
+	"foo": &T{},
+	"bar": &T{1, 2},
+	"bal": &T{3, 4},
+}
+
+var _ = map[string]*struct {
+	x, y int
+}{
+	"foo": &struct{ x, y int }{},
+	"bar": &struct{ x, y int }{1, 2},
+	"bal": &struct{ x, y int }{3, 4},
+}
+
+var _ = map[string]interface{}{
+	"foo": &T{},
+	"bar": &T{1, 2},
+	"bal": &T{3, 4},
+}
+
+var _ = map[string]*[]int{
+	"foo": &[]int{},
+	"bar": &[]int{1, 2},
+	"bal": &[]int{3, 4},
+}
+
+var _ = map[string]*[]int{
+	"foo": (&[]int{}),
+	"bar": (&[]int{1, 2}),
+	"bal": &[]int{3, 4},
+}
+
+var pieces4 = []*Piece{
+	&Piece{0, 0, Point{4, 1}, []Point{Point{0, 0}, Point{1, 0}, Point{1, 0}, Point{1, 0}}, nil, nil},
+	&Piece{1, 0, Point{1, 4}, []Point{Point{0, 0}, Point{0, 1}, Point{0, 1}, Point{0, 1}}, nil, nil},
+	&Piece{2, 0, Point{4, 1}, []Point{Point{0, 0}, Point{1, 0}, Point{1, 0}, Point{1, 0}}, nil, nil},
+	&Piece{3, 0, Point{1, 4}, []Point{Point{0, 0}, Point{0, 1}, Point{0, 1}, Point{0, 1}}, nil, nil},
+}
+
+var _ = map[T]T2{
+	T{1, 2}: T2{3, 4},
+	T{5, 6}: T2{7, 8},
+}
+
+var _ = map[*T]*T2{
+	&T{1, 2}: &T2{3, 4},
+	&T{5, 6}: &T2{7, 8},
+}
diff --git a/src/cmd/gofmt/testdata/crlf.golden b/src/cmd/gofmt/testdata/crlf.golden
new file mode 100644
index 0000000..193dbac
--- /dev/null
+++ b/src/cmd/gofmt/testdata/crlf.golden
@@ -0,0 +1,13 @@
+/*
+	Source containing CR/LF line endings.
+	The gofmt'ed output must only have LF
+	line endings.
+	Test case for issue 3961.
+*/
+package main
+
+func main() {
+	// line comment
+	println("hello, world!") // another line comment
+	println()
+}
diff --git a/src/cmd/gofmt/testdata/crlf.input b/src/cmd/gofmt/testdata/crlf.input
new file mode 100644
index 0000000..ae7e14d
--- /dev/null
+++ b/src/cmd/gofmt/testdata/crlf.input
@@ -0,0 +1,13 @@
+/*
+	Source containing CR/LF line endings.
+	The gofmt'ed output must only have LF
+	line endings.
+	Test case for issue 3961.
+*/
+package main
+
+func main() {
+	// line comment
+	println("hello, world!") // another line comment
+	println()
+}
diff --git a/src/cmd/gofmt/testdata/emptydecl.golden b/src/cmd/gofmt/testdata/emptydecl.golden
new file mode 100644
index 0000000..33d6435
--- /dev/null
+++ b/src/cmd/gofmt/testdata/emptydecl.golden
@@ -0,0 +1,14 @@
+//gofmt -s
+
+// Test case for issue 7631.
+
+package main
+
+// Keep this declaration
+var ()
+
+const (
+// Keep this declaration
+)
+
+func main() {}
diff --git a/src/cmd/gofmt/testdata/emptydecl.input b/src/cmd/gofmt/testdata/emptydecl.input
new file mode 100644
index 0000000..4948a61
--- /dev/null
+++ b/src/cmd/gofmt/testdata/emptydecl.input
@@ -0,0 +1,16 @@
+//gofmt -s
+
+// Test case for issue 7631.
+
+package main
+
+// Keep this declaration
+var ()
+
+const (
+// Keep this declaration
+)
+
+type ()
+
+func main() {}
\ No newline at end of file
diff --git a/src/cmd/gofmt/testdata/go2numbers.golden b/src/cmd/gofmt/testdata/go2numbers.golden
new file mode 100644
index 0000000..0184aaa
--- /dev/null
+++ b/src/cmd/gofmt/testdata/go2numbers.golden
@@ -0,0 +1,186 @@
+package p
+
+const (
+	// 0-octals
+	_ = 0
+	_ = 0123
+	_ = 0123456
+
+	_ = 0_123
+	_ = 0123_456
+
+	// decimals
+	_ = 1
+	_ = 1234
+	_ = 1234567
+
+	_ = 1_234
+	_ = 1_234_567
+
+	// hexadecimals
+	_ = 0x0
+	_ = 0x1234
+	_ = 0xcafef00d
+
+	_ = 0x0
+	_ = 0x1234
+	_ = 0xCAFEf00d
+
+	_ = 0x_0
+	_ = 0x_1234
+	_ = 0x_CAFE_f00d
+
+	// octals
+	_ = 0o0
+	_ = 0o1234
+	_ = 0o01234567
+
+	_ = 0o0
+	_ = 0o1234
+	_ = 0o01234567
+
+	_ = 0o_0
+	_ = 0o_1234
+	_ = 0o0123_4567
+
+	_ = 0o_0
+	_ = 0o_1234
+	_ = 0o0123_4567
+
+	// binaries
+	_ = 0b0
+	_ = 0b1011
+	_ = 0b00101101
+
+	_ = 0b0
+	_ = 0b1011
+	_ = 0b00101101
+
+	_ = 0b_0
+	_ = 0b10_11
+	_ = 0b_0010_1101
+
+	// decimal floats
+	_ = 0.
+	_ = 123.
+	_ = 0123.
+
+	_ = .0
+	_ = .123
+	_ = .0123
+
+	_ = 0e0
+	_ = 123e+0
+	_ = 0123e-1
+
+	_ = 0e-0
+	_ = 123e+0
+	_ = 0123e123
+
+	_ = 0.e+1
+	_ = 123.e-10
+	_ = 0123.e123
+
+	_ = .0e-1
+	_ = .123e+10
+	_ = .0123e123
+
+	_ = 0.0
+	_ = 123.123
+	_ = 0123.0123
+
+	_ = 0.0e1
+	_ = 123.123e-10
+	_ = 0123.0123e+456
+
+	_ = 1_2_3.
+	_ = 0_123.
+
+	_ = 0_0e0
+	_ = 1_2_3e0
+	_ = 0_123e0
+
+	_ = 0e-0_0
+	_ = 1_2_3e+0
+	_ = 0123e1_2_3
+
+	_ = 0.e+1
+	_ = 123.e-1_0
+	_ = 01_23.e123
+
+	_ = .0e-1
+	_ = .123e+10
+	_ = .0123e123
+
+	_ = 1_2_3.123
+	_ = 0123.01_23
+
+	// hexadecimal floats
+	_ = 0x0.p+0
+	_ = 0xdeadcafe.p-10
+	_ = 0x1234.p123
+
+	_ = 0x.1p-0
+	_ = 0x.deadcafep2
+	_ = 0x.1234p+10
+
+	_ = 0x0p0
+	_ = 0xdeadcafep+1
+	_ = 0x1234p-10
+
+	_ = 0x0.0p0
+	_ = 0xdead.cafep+1
+	_ = 0x12.34p-10
+
+	_ = 0xdead_cafep+1
+	_ = 0x_1234p-10
+
+	_ = 0x_dead_cafe.p-10
+	_ = 0x12_34.p1_2_3
+	_ = 0x1_2_3_4.p-1_2_3
+
+	// imaginaries
+	_ = 0i
+	_ = 0i
+	_ = 8i
+	_ = 0i
+	_ = 123i
+	_ = 123i
+	_ = 56789i
+	_ = 1234i
+	_ = 1234567i
+
+	_ = 0i
+	_ = 0i
+	_ = 8i
+	_ = 0i
+	_ = 123i
+	_ = 123i
+	_ = 56_789i
+	_ = 1_234i
+	_ = 1_234_567i
+
+	_ = 0.i
+	_ = 123.i
+	_ = 0123.i
+	_ = 000123.i
+
+	_ = 0e0i
+	_ = 123e0i
+	_ = 0123e0i
+	_ = 000123e0i
+
+	_ = 0.e+1i
+	_ = 123.e-1_0i
+	_ = 01_23.e123i
+	_ = 00_01_23.e123i
+
+	_ = 0b1010i
+	_ = 0b1010i
+	_ = 0o660i
+	_ = 0o660i
+	_ = 0xabcDEFi
+	_ = 0xabcDEFi
+	_ = 0xabcDEFp0i
+	_ = 0xabcDEFp0i
+)
diff --git a/src/cmd/gofmt/testdata/go2numbers.input b/src/cmd/gofmt/testdata/go2numbers.input
new file mode 100644
index 0000000..f3e7828
--- /dev/null
+++ b/src/cmd/gofmt/testdata/go2numbers.input
@@ -0,0 +1,186 @@
+package p
+
+const (
+	// 0-octals
+	_ = 0
+	_ = 0123
+	_ = 0123456
+
+	_ = 0_123
+	_ = 0123_456
+
+	// decimals
+	_ = 1
+	_ = 1234
+	_ = 1234567
+
+	_ = 1_234
+	_ = 1_234_567
+
+	// hexadecimals
+	_ = 0x0
+	_ = 0x1234
+	_ = 0xcafef00d
+
+	_ = 0X0
+	_ = 0X1234
+	_ = 0XCAFEf00d
+
+	_ = 0X_0
+	_ = 0X_1234
+	_ = 0X_CAFE_f00d
+
+	// octals
+	_ = 0o0
+	_ = 0o1234
+	_ = 0o01234567
+
+	_ = 0O0
+	_ = 0O1234
+	_ = 0O01234567
+
+	_ = 0o_0
+	_ = 0o_1234
+	_ = 0o0123_4567
+
+	_ = 0O_0
+	_ = 0O_1234
+	_ = 0O0123_4567
+
+	// binaries
+	_ = 0b0
+	_ = 0b1011
+	_ = 0b00101101
+
+	_ = 0B0
+	_ = 0B1011
+	_ = 0B00101101
+
+	_ = 0b_0
+	_ = 0b10_11
+	_ = 0b_0010_1101
+
+	// decimal floats
+	_ = 0.
+	_ = 123.
+	_ = 0123.
+
+	_ = .0
+	_ = .123
+	_ = .0123
+
+	_ = 0e0
+	_ = 123e+0
+	_ = 0123E-1
+
+	_ = 0e-0
+	_ = 123E+0
+	_ = 0123E123
+
+	_ = 0.e+1
+	_ = 123.E-10
+	_ = 0123.e123
+
+	_ = .0e-1
+	_ = .123E+10
+	_ = .0123E123
+
+	_ = 0.0
+	_ = 123.123
+	_ = 0123.0123
+
+	_ = 0.0e1
+	_ = 123.123E-10
+	_ = 0123.0123e+456
+
+	_ = 1_2_3.
+	_ = 0_123.
+
+	_ = 0_0e0
+	_ = 1_2_3e0
+	_ = 0_123e0
+
+	_ = 0e-0_0
+	_ = 1_2_3E+0
+	_ = 0123E1_2_3
+
+	_ = 0.e+1
+	_ = 123.E-1_0
+	_ = 01_23.e123
+
+	_ = .0e-1
+	_ = .123E+10
+	_ = .0123E123
+
+	_ = 1_2_3.123
+	_ = 0123.01_23
+
+	// hexadecimal floats
+	_ = 0x0.p+0
+	_ = 0Xdeadcafe.p-10
+	_ = 0x1234.P123
+
+	_ = 0x.1p-0
+	_ = 0X.deadcafep2
+	_ = 0x.1234P+10
+
+	_ = 0x0p0
+	_ = 0Xdeadcafep+1
+	_ = 0x1234P-10
+
+	_ = 0x0.0p0
+	_ = 0Xdead.cafep+1
+	_ = 0x12.34P-10
+
+	_ = 0Xdead_cafep+1
+	_ = 0x_1234P-10
+
+	_ = 0X_dead_cafe.p-10
+	_ = 0x12_34.P1_2_3
+	_ = 0X1_2_3_4.P-1_2_3
+
+	// imaginaries
+	_ = 0i
+	_ = 00i
+	_ = 08i
+	_ = 0000000000i
+	_ = 0123i
+	_ = 0000000123i
+	_ = 0000056789i
+	_ = 1234i
+	_ = 1234567i
+
+	_ = 0i
+	_ = 0_0i
+	_ = 0_8i
+	_ = 0_000_000_000i
+	_ = 0_123i
+	_ = 0_000_000_123i
+	_ = 0_000_056_789i
+	_ = 1_234i
+	_ = 1_234_567i
+
+	_ = 0.i
+	_ = 123.i
+	_ = 0123.i
+	_ = 000123.i
+
+	_ = 0e0i
+	_ = 123e0i
+	_ = 0123E0i
+	_ = 000123E0i
+
+	_ = 0.e+1i
+	_ = 123.E-1_0i
+	_ = 01_23.e123i
+	_ = 00_01_23.e123i
+
+	_ = 0b1010i
+	_ = 0B1010i
+	_ = 0o660i
+	_ = 0O660i
+	_ = 0xabcDEFi
+	_ = 0XabcDEFi
+	_ = 0xabcDEFP0i
+	_ = 0XabcDEFp0i
+)
diff --git a/src/cmd/gofmt/testdata/import.golden b/src/cmd/gofmt/testdata/import.golden
new file mode 100644
index 0000000..1125b70
--- /dev/null
+++ b/src/cmd/gofmt/testdata/import.golden
@@ -0,0 +1,194 @@
+// package comment
+package main
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"math"
+)
+
+import (
+	"fmt"
+
+	"math"
+
+	"log"
+
+	"errors"
+
+	"io"
+)
+
+// We reset the line numbering to test that
+// the formatting works independent of line directives
+//line :19
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"math"
+
+	"fmt"
+
+	"math"
+
+	"log"
+
+	"errors"
+
+	"io"
+)
+
+import (
+	// a block with comments
+	"errors"
+	"fmt" // for Printf
+	"io"  // for Reader
+	"log" // for Fatal
+	"math"
+)
+
+import (
+	"fmt" // for Printf
+
+	"math"
+
+	"log" // for Fatal
+
+	"errors"
+
+	"io" // for Reader
+)
+
+import (
+	// for Printf
+	"fmt"
+
+	"math"
+
+	// for Fatal
+	"log"
+
+	"errors"
+
+	// for Reader
+	"io"
+)
+
+import (
+	"errors"
+	"fmt" // for Printf
+	"io"  // for Reader
+	"log" // for Fatal
+	"math"
+
+	"fmt" // for Printf
+
+	"math"
+
+	"log" // for Fatal
+
+	"errors"
+
+	"io" // for Reader
+)
+
+import (
+	"fmt" // for Printf
+
+	"errors"
+	"io"  // for Reader
+	"log" // for Fatal
+	"math"
+
+	"errors"
+	"fmt" // for Printf
+	"io"  // for Reader
+	"log" // for Fatal
+	"math"
+)
+
+// Test deduping and extended sorting
+import (
+	a "A" // aA
+	b "A" // bA1
+	b "A" // bA2
+	"B"   // B
+	. "B" // .B
+	_ "B" // _b
+	"C"
+	a "D" // aD
+)
+
+import (
+	"dedup_by_group"
+
+	"dedup_by_group"
+)
+
+import (
+	"fmt" // for Printf
+	/* comment */ io1 "io"
+	/* comment */ io2 "io"
+	/* comment */ "log"
+)
+
+import (
+	"fmt"
+	/* comment */ io1 "io"
+	/* comment */ io2 "io" // hello
+	"math"                 /* right side */
+	// end
+)
+
+import (
+	"errors" // for New
+	"fmt"
+	/* comment */ io1 "io" /* before */ // after
+	io2 "io"               // another
+	// end
+)
+
+import (
+	"errors" // for New
+	/* left */ "fmt" /* right */
+	"log"            // for Fatal
+	/* left */ "math" /* right */
+)
+
+import /* why */ /* comment here? */ (
+	/* comment */ "fmt"
+	"math"
+)
+
+// Reset it again
+//line :100
+
+// Dedup with different import styles
+import (
+	"path"
+	. "path"
+	_ "path"
+	pathpkg "path"
+)
+
+/* comment */
+import (
+	"fmt"
+	"math" // for Abs
+	// This is a new run
+	"errors"
+	"fmt"
+)
+
+// End an import declaration in the same line
+// as the last import. See golang.org/issue/33538.
+// Note: Must be the last (or 2nd last) line of the file.
+import (
+	"fmt"
+	"math"
+)
diff --git a/src/cmd/gofmt/testdata/import.input b/src/cmd/gofmt/testdata/import.input
new file mode 100644
index 0000000..040b872
--- /dev/null
+++ b/src/cmd/gofmt/testdata/import.input
@@ -0,0 +1,199 @@
+// package comment
+package main
+
+import (
+	"fmt"
+	"math"
+	"log"
+	"errors"
+	"io"
+)
+
+import (
+	"fmt"
+
+	"math"
+
+	"log"
+
+	"errors"
+
+	"io"
+)
+
+// We reset the line numbering to test that
+// the formatting works independent of line directives
+//line :19
+
+import (
+	"fmt"
+	"math"
+	"log"
+	"errors"
+	"io"
+
+	"fmt"
+
+	"math"
+
+	"log"
+
+	"errors"
+
+	"io"
+)
+
+import (
+	// a block with comments
+	"fmt" // for Printf
+	"math"
+	"log" // for Fatal
+	"errors"
+	"io" // for Reader
+)
+
+import (
+	"fmt" // for Printf
+
+	"math"
+
+	"log" // for Fatal
+
+	"errors"
+
+	"io" // for Reader
+)
+
+import (
+	// for Printf
+	"fmt"
+
+	"math"
+
+	// for Fatal
+	"log"
+
+	"errors"
+
+	// for Reader
+	"io"
+)
+
+import (
+	"fmt" // for Printf
+	"math"
+	"log" // for Fatal
+	"errors"
+	"io" // for Reader
+
+	"fmt" // for Printf
+
+	"math"
+
+	"log" // for Fatal
+
+	"errors"
+
+	"io" // for Reader
+)
+
+import (
+	"fmt" // for Printf
+
+	"math"
+	"log" // for Fatal
+	"errors"
+	"io" // for Reader
+
+	"fmt" // for Printf
+	"math"
+	"log" // for Fatal
+	"errors"
+	"io" // for Reader
+)
+
+// Test deduping and extended sorting
+import (
+	"B" // B
+	a "A" // aA
+	b "A" // bA2
+	b "A" // bA1
+	. "B" // .B
+	. "B"
+	"C"
+	"C"
+	"C"
+	a "D" // aD
+	"B"
+	_ "B" // _b
+)
+
+import (
+	"dedup_by_group"
+	"dedup_by_group"
+
+	"dedup_by_group"
+)
+
+import (
+	/* comment */ io1 "io"
+	"fmt" // for Printf
+	/* comment */ "log"
+	/* comment */ io2 "io"
+)
+
+import (
+	/* comment */ io2 "io" // hello
+	/* comment */ io1 "io"
+	"math" /* right side */
+	"fmt"
+	// end
+)
+
+import (
+	/* comment */ io1 "io" /* before */ // after
+	"fmt"
+	"errors" // for New
+	io2 "io" // another
+	// end
+)
+
+import (
+	/* left */ "fmt" /* right */
+	"errors" // for New
+	/* left */ "math" /* right */
+	"log" // for Fatal
+)
+
+import /* why */ /* comment here? */ (
+	/* comment */ "fmt"
+	"math"
+)
+
+// Reset it again
+//line :100
+
+// Dedup with different import styles
+import (
+	"path"
+	. "path"
+	_ "path"
+	"path"
+	pathpkg "path"
+)
+
+/* comment */
+import (
+	"math" // for Abs
+	"fmt"
+	// This is a new run
+	"errors"
+	"fmt"
+	"errors"
+)
+
+// End an import declaration in the same line
+// as the last import. See golang.org/issue/33538.
+// Note: Must be the last (or 2nd last) line of the file.
+import("fmt"
+"math")
\ No newline at end of file
diff --git a/src/cmd/gofmt/testdata/issue28082.golden b/src/cmd/gofmt/testdata/issue28082.golden
new file mode 100644
index 0000000..5837fd5
--- /dev/null
+++ b/src/cmd/gofmt/testdata/issue28082.golden
@@ -0,0 +1,13 @@
+// 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.
+
+package main
+
+// testcase for issue #28082
+
+func foo() {}
+
+func main() {}
+
+func bar() {}
diff --git a/src/cmd/gofmt/testdata/issue28082.input b/src/cmd/gofmt/testdata/issue28082.input
new file mode 100644
index 0000000..ab7d218
--- /dev/null
+++ b/src/cmd/gofmt/testdata/issue28082.input
@@ -0,0 +1,13 @@
+// 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.
+
+package main
+
+// testcase for issue #28082
+
+func foo(                                                                                                ) {}
+
+func main(                                                                                                      ) {}
+
+func bar() {}
diff --git a/src/cmd/gofmt/testdata/ranges.golden b/src/cmd/gofmt/testdata/ranges.golden
new file mode 100644
index 0000000..506b3a0
--- /dev/null
+++ b/src/cmd/gofmt/testdata/ranges.golden
@@ -0,0 +1,30 @@
+//gofmt -s
+
+// Test cases for range simplification.
+package p
+
+func _() {
+	for a, b = range x {
+	}
+	for a = range x {
+	}
+	for _, b = range x {
+	}
+	for range x {
+	}
+
+	for a = range x {
+	}
+	for range x {
+	}
+
+	for a, b := range x {
+	}
+	for a := range x {
+	}
+	for _, b := range x {
+	}
+
+	for a := range x {
+	}
+}
diff --git a/src/cmd/gofmt/testdata/ranges.input b/src/cmd/gofmt/testdata/ranges.input
new file mode 100644
index 0000000..df5f833
--- /dev/null
+++ b/src/cmd/gofmt/testdata/ranges.input
@@ -0,0 +1,20 @@
+//gofmt -s
+
+// Test cases for range simplification.
+package p
+
+func _() {
+	for a, b = range x {}
+	for a, _ = range x {}
+	for _, b = range x {}
+	for _, _ = range x {}
+
+	for a = range x {}
+	for _ = range x {}
+
+	for a, b := range x {}
+	for a, _ := range x {}
+	for _, b := range x {}
+
+	for a := range x {}
+}
diff --git a/src/cmd/gofmt/testdata/rewrite1.golden b/src/cmd/gofmt/testdata/rewrite1.golden
new file mode 100644
index 0000000..3ee5373
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite1.golden
@@ -0,0 +1,14 @@
+//gofmt -r=Foo->Bar
+
+// Copyright 2011 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.
+
+package main
+
+type Bar int
+
+func main() {
+	var a Bar
+	println(a)
+}
diff --git a/src/cmd/gofmt/testdata/rewrite1.input b/src/cmd/gofmt/testdata/rewrite1.input
new file mode 100644
index 0000000..a84c8f7
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite1.input
@@ -0,0 +1,14 @@
+//gofmt -r=Foo->Bar
+
+// Copyright 2011 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.
+
+package main
+
+type Foo int
+
+func main() {
+	var a Foo
+	println(a)
+}
diff --git a/src/cmd/gofmt/testdata/rewrite10.golden b/src/cmd/gofmt/testdata/rewrite10.golden
new file mode 100644
index 0000000..1dd781f
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite10.golden
@@ -0,0 +1,19 @@
+//gofmt -r=a->a
+
+// 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.
+
+// Issue 33103, 33104, and 33105.
+
+package pkg
+
+func fn() {
+	_ = func() {
+		switch {
+		default:
+		}
+	}
+	_ = func() string {}
+	_ = func() { var ptr *string; println(ptr) }
+}
diff --git a/src/cmd/gofmt/testdata/rewrite10.input b/src/cmd/gofmt/testdata/rewrite10.input
new file mode 100644
index 0000000..1dd781f
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite10.input
@@ -0,0 +1,19 @@
+//gofmt -r=a->a
+
+// 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.
+
+// Issue 33103, 33104, and 33105.
+
+package pkg
+
+func fn() {
+	_ = func() {
+		switch {
+		default:
+		}
+	}
+	_ = func() string {}
+	_ = func() { var ptr *string; println(ptr) }
+}
diff --git a/src/cmd/gofmt/testdata/rewrite2.golden b/src/cmd/gofmt/testdata/rewrite2.golden
new file mode 100644
index 0000000..f980e03
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite2.golden
@@ -0,0 +1,12 @@
+//gofmt -r=int->bool
+
+// Copyright 2011 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.
+
+package p
+
+// Slices have nil Len values in the corresponding ast.ArrayType
+// node and reflect.NewValue(slice.Len) is an invalid reflect.Value.
+// The rewriter must not crash in that case. Was issue 1696.
+func f() []bool {}
diff --git a/src/cmd/gofmt/testdata/rewrite2.input b/src/cmd/gofmt/testdata/rewrite2.input
new file mode 100644
index 0000000..489be4e
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite2.input
@@ -0,0 +1,12 @@
+//gofmt -r=int->bool
+
+// Copyright 2011 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.
+
+package p
+
+// Slices have nil Len values in the corresponding ast.ArrayType
+// node and reflect.NewValue(slice.Len) is an invalid reflect.Value.
+// The rewriter must not crash in that case. Was issue 1696.
+func f() []int {}
diff --git a/src/cmd/gofmt/testdata/rewrite3.golden b/src/cmd/gofmt/testdata/rewrite3.golden
new file mode 100644
index 0000000..261a220
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite3.golden
@@ -0,0 +1,14 @@
+//gofmt -r=x->x
+
+// Copyright 2011 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.
+
+package main
+
+// Field tags are *ast.BasicLit nodes that are nil when the tag is
+// absent. These nil nodes must not be mistaken for expressions,
+// the rewriter should not try to dereference them. Was issue 2410.
+type Foo struct {
+	Field int
+}
diff --git a/src/cmd/gofmt/testdata/rewrite3.input b/src/cmd/gofmt/testdata/rewrite3.input
new file mode 100644
index 0000000..261a220
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite3.input
@@ -0,0 +1,14 @@
+//gofmt -r=x->x
+
+// Copyright 2011 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.
+
+package main
+
+// Field tags are *ast.BasicLit nodes that are nil when the tag is
+// absent. These nil nodes must not be mistaken for expressions,
+// the rewriter should not try to dereference them. Was issue 2410.
+type Foo struct {
+	Field int
+}
diff --git a/src/cmd/gofmt/testdata/rewrite4.golden b/src/cmd/gofmt/testdata/rewrite4.golden
new file mode 100644
index 0000000..b05547b
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite4.golden
@@ -0,0 +1,76 @@
+//gofmt -r=(x)->x
+
+// Copyright 2012 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.
+
+// Rewriting of parenthesized expressions (x) -> x
+// must not drop parentheses if that would lead to
+// wrong association of the operands.
+// Was issue 1847.
+
+package main
+
+// From example 1 of issue 1847.
+func _() {
+	var t = (&T{1000}).Id()
+}
+
+// From example 2 of issue 1847.
+func _() {
+	fmt.Println((*xpp).a)
+}
+
+// Some more test cases.
+func _() {
+	_ = (-x).f
+	_ = (*x).f
+	_ = (&x).f
+	_ = (!x).f
+	_ = -x.f
+	_ = *x.f
+	_ = &x.f
+	_ = !x.f
+	(-x).f()
+	(*x).f()
+	(&x).f()
+	(!x).f()
+	_ = -x.f()
+	_ = *x.f()
+	_ = &x.f()
+	_ = !x.f()
+
+	_ = (-x).f
+	_ = (*x).f
+	_ = (&x).f
+	_ = (!x).f
+	_ = -x.f
+	_ = *x.f
+	_ = &x.f
+	_ = !x.f
+	(-x).f()
+	(*x).f()
+	(&x).f()
+	(!x).f()
+	_ = -x.f()
+	_ = *x.f()
+	_ = &x.f()
+	_ = !x.f()
+
+	_ = -x.f
+	_ = *x.f
+	_ = &x.f
+	_ = !x.f
+	_ = -x.f
+	_ = *x.f
+	_ = &x.f
+	_ = !x.f
+	_ = -x.f()
+	_ = *x.f()
+	_ = &x.f()
+	_ = !x.f()
+	_ = -x.f()
+	_ = *x.f()
+	_ = &x.f()
+	_ = !x.f()
+}
diff --git a/src/cmd/gofmt/testdata/rewrite4.input b/src/cmd/gofmt/testdata/rewrite4.input
new file mode 100644
index 0000000..0817099
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite4.input
@@ -0,0 +1,76 @@
+//gofmt -r=(x)->x
+
+// Copyright 2012 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.
+
+// Rewriting of parenthesized expressions (x) -> x
+// must not drop parentheses if that would lead to
+// wrong association of the operands.
+// Was issue 1847.
+
+package main
+
+// From example 1 of issue 1847.
+func _() {
+	var t = (&T{1000}).Id()
+}
+
+// From example 2 of issue 1847.
+func _() {
+       fmt.Println((*xpp).a)
+}
+
+// Some more test cases.
+func _() {
+	_ = (-x).f
+	_ = (*x).f
+	_ = (&x).f
+	_ = (!x).f
+	_ = (-x.f)
+	_ = (*x.f)
+	_ = (&x.f)
+	_ = (!x.f)
+	(-x).f()
+	(*x).f()
+	(&x).f()
+	(!x).f()
+	_ = (-x.f())
+	_ = (*x.f())
+	_ = (&x.f())
+	_ = (!x.f())
+
+	_ = ((-x)).f
+	_ = ((*x)).f
+	_ = ((&x)).f
+	_ = ((!x)).f
+	_ = ((-x.f))
+	_ = ((*x.f))
+	_ = ((&x.f))
+	_ = ((!x.f))
+	((-x)).f()
+	((*x)).f()
+	((&x)).f()
+	((!x)).f()
+	_ = ((-x.f()))
+	_ = ((*x.f()))
+	_ = ((&x.f()))
+	_ = ((!x.f()))
+
+	_ = -(x).f
+	_ = *(x).f
+	_ = &(x).f
+	_ = !(x).f
+	_ = -x.f
+	_ = *x.f
+	_ = &x.f
+	_ = !x.f
+	_ = -(x).f()
+	_ = *(x).f()
+	_ = &(x).f()
+	_ = !(x).f()
+	_ = -x.f()
+	_ = *x.f()
+	_ = &x.f()
+	_ = !x.f()
+}
diff --git a/src/cmd/gofmt/testdata/rewrite5.golden b/src/cmd/gofmt/testdata/rewrite5.golden
new file mode 100644
index 0000000..9beb34a
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite5.golden
@@ -0,0 +1,17 @@
+//gofmt -r=x+x->2*x
+
+// Copyright 2011 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.
+
+// Rewriting of expressions containing nodes with associated comments to
+// expressions without those nodes must also eliminate the associated
+// comments.
+
+package p
+
+func f(x int) int {
+	_ = 2 * x // this comment remains in the rewrite
+	_ = 2 * x
+	return 2 * x
+}
diff --git a/src/cmd/gofmt/testdata/rewrite5.input b/src/cmd/gofmt/testdata/rewrite5.input
new file mode 100644
index 0000000..d7a6122
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite5.input
@@ -0,0 +1,17 @@
+//gofmt -r=x+x->2*x
+
+// Copyright 2011 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.
+
+// Rewriting of expressions containing nodes with associated comments to
+// expressions without those nodes must also eliminate the associated
+// comments.
+
+package p
+
+func f(x int) int {
+	_ = x + x // this comment remains in the rewrite
+	_ = x /* this comment must not be in the rewrite */ + x
+	return x /* this comment must not be in the rewrite */ + x
+}
diff --git a/src/cmd/gofmt/testdata/rewrite6.golden b/src/cmd/gofmt/testdata/rewrite6.golden
new file mode 100644
index 0000000..48ec9aa
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite6.golden
@@ -0,0 +1,17 @@
+//gofmt -r=fun(x)->Fun(x)
+
+// 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.
+
+// Rewriting of calls must take the ... (ellipsis)
+// attribute for the last argument into account.
+
+package p
+
+func fun(x []int) {}
+
+func g(x []int) {
+	Fun(x)    // -r='fun(x)->Fun(x)' should rewrite this to Fun(x)
+	fun(x...) // -r='fun(x)->Fun(x)' should not rewrite this
+}
diff --git a/src/cmd/gofmt/testdata/rewrite6.input b/src/cmd/gofmt/testdata/rewrite6.input
new file mode 100644
index 0000000..b085a84
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite6.input
@@ -0,0 +1,17 @@
+//gofmt -r=fun(x)->Fun(x)
+
+// 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.
+
+// Rewriting of calls must take the ... (ellipsis)
+// attribute for the last argument into account.
+
+package p
+
+func fun(x []int) {}
+
+func g(x []int) {
+	fun(x)    // -r='fun(x)->Fun(x)' should rewrite this to Fun(x)
+	fun(x...) // -r='fun(x)->Fun(x)' should not rewrite this
+}
diff --git a/src/cmd/gofmt/testdata/rewrite7.golden b/src/cmd/gofmt/testdata/rewrite7.golden
new file mode 100644
index 0000000..8386a0b
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite7.golden
@@ -0,0 +1,17 @@
+//gofmt -r=fun(x...)->Fun(x)
+
+// 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.
+
+// Rewriting of calls must take the ... (ellipsis)
+// attribute for the last argument into account.
+
+package p
+
+func fun(x []int) {}
+
+func g(x []int) {
+	fun(x) // -r='fun(x...)->Fun(x)' should not rewrite this
+	Fun(x) // -r='fun(x...)->Fun(x)' should rewrite this to Fun(x)
+}
diff --git a/src/cmd/gofmt/testdata/rewrite7.input b/src/cmd/gofmt/testdata/rewrite7.input
new file mode 100644
index 0000000..c198470
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite7.input
@@ -0,0 +1,17 @@
+//gofmt -r=fun(x...)->Fun(x)
+
+// 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.
+
+// Rewriting of calls must take the ... (ellipsis)
+// attribute for the last argument into account.
+
+package p
+
+func fun(x []int) {}
+
+func g(x []int) {
+	fun(x)    // -r='fun(x...)->Fun(x)' should not rewrite this
+	fun(x...) // -r='fun(x...)->Fun(x)' should rewrite this to Fun(x)
+}
diff --git a/src/cmd/gofmt/testdata/rewrite8.golden b/src/cmd/gofmt/testdata/rewrite8.golden
new file mode 100644
index 0000000..62f0419
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite8.golden
@@ -0,0 +1,12 @@
+//gofmt -r=interface{}->int
+
+// 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.
+
+// Check that literal type expression rewrites are accepted.
+// Was issue 4406.
+
+package p
+
+type T int
diff --git a/src/cmd/gofmt/testdata/rewrite8.input b/src/cmd/gofmt/testdata/rewrite8.input
new file mode 100644
index 0000000..7964c5c
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite8.input
@@ -0,0 +1,12 @@
+//gofmt -r=interface{}->int
+
+// 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.
+
+// Check that literal type expression rewrites are accepted.
+// Was issue 4406.
+
+package p
+
+type T interface{}
diff --git a/src/cmd/gofmt/testdata/rewrite9.golden b/src/cmd/gofmt/testdata/rewrite9.golden
new file mode 100644
index 0000000..fffbd3d
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite9.golden
@@ -0,0 +1,11 @@
+//gofmt -r=a&&b!=2->a
+
+// Copyright 2017 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.
+
+// Issue 18987.
+
+package p
+
+const _ = x != 1
diff --git a/src/cmd/gofmt/testdata/rewrite9.input b/src/cmd/gofmt/testdata/rewrite9.input
new file mode 100644
index 0000000..106ad94
--- /dev/null
+++ b/src/cmd/gofmt/testdata/rewrite9.input
@@ -0,0 +1,11 @@
+//gofmt -r=a&&b!=2->a
+
+// Copyright 2017 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.
+
+// Issue 18987.
+
+package p
+
+const _ = x != 1 && x != 2
diff --git a/src/cmd/gofmt/testdata/slices1.golden b/src/cmd/gofmt/testdata/slices1.golden
new file mode 100644
index 0000000..04bc16f
--- /dev/null
+++ b/src/cmd/gofmt/testdata/slices1.golden
@@ -0,0 +1,66 @@
+//gofmt -s
+
+// Test cases for slice expression simplification.
+package p
+
+var (
+	a [10]byte
+	b [20]float32
+	s []int
+	t struct {
+		s []byte
+	}
+
+	_ = a[0:]
+	_ = a[1:10]
+	_ = a[2:]
+	_ = a[3:(len(a))]
+	_ = a[len(a) : len(a)-1]
+	_ = a[0:len(b)]
+	_ = a[2:len(a):len(a)]
+
+	_ = a[:]
+	_ = a[:10]
+	_ = a[:]
+	_ = a[:(len(a))]
+	_ = a[:len(a)-1]
+	_ = a[:len(b)]
+	_ = a[:len(a):len(a)]
+
+	_ = s[0:]
+	_ = s[1:10]
+	_ = s[2:]
+	_ = s[3:(len(s))]
+	_ = s[len(a) : len(s)-1]
+	_ = s[0:len(b)]
+	_ = s[2:len(s):len(s)]
+
+	_ = s[:]
+	_ = s[:10]
+	_ = s[:]
+	_ = s[:(len(s))]
+	_ = s[:len(s)-1]
+	_ = s[:len(b)]
+	_ = s[:len(s):len(s)]
+
+	_ = t.s[0:]
+	_ = t.s[1:10]
+	_ = t.s[2:len(t.s)]
+	_ = t.s[3:(len(t.s))]
+	_ = t.s[len(a) : len(t.s)-1]
+	_ = t.s[0:len(b)]
+	_ = t.s[2:len(t.s):len(t.s)]
+
+	_ = t.s[:]
+	_ = t.s[:10]
+	_ = t.s[:len(t.s)]
+	_ = t.s[:(len(t.s))]
+	_ = t.s[:len(t.s)-1]
+	_ = t.s[:len(b)]
+	_ = t.s[:len(t.s):len(t.s)]
+)
+
+func _() {
+	s := s[0:]
+	_ = s
+}
diff --git a/src/cmd/gofmt/testdata/slices1.input b/src/cmd/gofmt/testdata/slices1.input
new file mode 100644
index 0000000..1f25c43
--- /dev/null
+++ b/src/cmd/gofmt/testdata/slices1.input
@@ -0,0 +1,66 @@
+//gofmt -s
+
+// Test cases for slice expression simplification.
+package p
+
+var (
+	a [10]byte
+	b [20]float32
+	s []int
+	t struct {
+		s []byte
+	}
+
+	_ = a[0:]
+	_ = a[1:10]
+	_ = a[2:len(a)]
+	_ = a[3:(len(a))]
+	_ = a[len(a) : len(a)-1]
+	_ = a[0:len(b)]
+	_ = a[2:len(a):len(a)]
+
+	_ = a[:]
+	_ = a[:10]
+	_ = a[:len(a)]
+	_ = a[:(len(a))]
+	_ = a[:len(a)-1]
+	_ = a[:len(b)]
+	_ = a[:len(a):len(a)]
+
+	_ = s[0:]
+	_ = s[1:10]
+	_ = s[2:len(s)]
+	_ = s[3:(len(s))]
+	_ = s[len(a) : len(s)-1]
+	_ = s[0:len(b)]
+	_ = s[2:len(s):len(s)]
+
+	_ = s[:]
+	_ = s[:10]
+	_ = s[:len(s)]
+	_ = s[:(len(s))]
+	_ = s[:len(s)-1]
+	_ = s[:len(b)]
+	_ = s[:len(s):len(s)]
+
+	_ = t.s[0:]
+	_ = t.s[1:10]
+	_ = t.s[2:len(t.s)]
+	_ = t.s[3:(len(t.s))]
+	_ = t.s[len(a) : len(t.s)-1]
+	_ = t.s[0:len(b)]
+	_ = t.s[2:len(t.s):len(t.s)]
+
+	_ = t.s[:]
+	_ = t.s[:10]
+	_ = t.s[:len(t.s)]
+	_ = t.s[:(len(t.s))]
+	_ = t.s[:len(t.s)-1]
+	_ = t.s[:len(b)]
+	_ = t.s[:len(t.s):len(t.s)]
+)
+
+func _() {
+	s := s[0:len(s)]
+	_ = s
+}
diff --git a/src/cmd/gofmt/testdata/stdin1.golden b/src/cmd/gofmt/testdata/stdin1.golden
new file mode 100644
index 0000000..9e4dcd2
--- /dev/null
+++ b/src/cmd/gofmt/testdata/stdin1.golden
@@ -0,0 +1,5 @@
+	//gofmt -stdin
+
+	if x {
+		y
+	}
diff --git a/src/cmd/gofmt/testdata/stdin1.input b/src/cmd/gofmt/testdata/stdin1.input
new file mode 100644
index 0000000..9e4dcd2
--- /dev/null
+++ b/src/cmd/gofmt/testdata/stdin1.input
@@ -0,0 +1,5 @@
+	//gofmt -stdin
+
+	if x {
+		y
+	}
diff --git a/src/cmd/gofmt/testdata/stdin2.golden b/src/cmd/gofmt/testdata/stdin2.golden
new file mode 100644
index 0000000..57df355
--- /dev/null
+++ b/src/cmd/gofmt/testdata/stdin2.golden
@@ -0,0 +1,11 @@
+//gofmt -stdin
+
+var x int
+
+func f() {
+	y := z
+	/* this is a comment */
+	// this is a comment too
+}
+
+
diff --git a/src/cmd/gofmt/testdata/stdin2.input b/src/cmd/gofmt/testdata/stdin2.input
new file mode 100644
index 0000000..69d6bdd
--- /dev/null
+++ b/src/cmd/gofmt/testdata/stdin2.input
@@ -0,0 +1,11 @@
+//gofmt -stdin
+
+var x int
+
+
+func f() { y := z
+	/* this is a comment */
+	// this is a comment too
+}
+
+
diff --git a/src/cmd/gofmt/testdata/stdin3.golden b/src/cmd/gofmt/testdata/stdin3.golden
new file mode 100644
index 0000000..d6da0e4
--- /dev/null
+++ b/src/cmd/gofmt/testdata/stdin3.golden
@@ -0,0 +1,7 @@
+		//gofmt -stdin
+
+		/* note: no newline at end of file */
+		for i := 0; i < 10; i++ {
+			s += i
+		}
+	
\ No newline at end of file
diff --git a/src/cmd/gofmt/testdata/stdin3.input b/src/cmd/gofmt/testdata/stdin3.input
new file mode 100644
index 0000000..ab46c10
--- /dev/null
+++ b/src/cmd/gofmt/testdata/stdin3.input
@@ -0,0 +1,5 @@
+		//gofmt -stdin
+
+		/* note: no newline at end of file */
+		for i := 0; i < 10; i++ { s += i }
+	
\ No newline at end of file
diff --git a/src/cmd/gofmt/testdata/stdin4.golden b/src/cmd/gofmt/testdata/stdin4.golden
new file mode 100644
index 0000000..0c7acac
--- /dev/null
+++ b/src/cmd/gofmt/testdata/stdin4.golden
@@ -0,0 +1,5 @@
+	//gofmt -stdin
+
+	// comment
+
+	i := 0
diff --git a/src/cmd/gofmt/testdata/stdin4.input b/src/cmd/gofmt/testdata/stdin4.input
new file mode 100644
index 0000000..1fc73f3
--- /dev/null
+++ b/src/cmd/gofmt/testdata/stdin4.input
@@ -0,0 +1,5 @@
+	//gofmt -stdin
+
+	// comment
+	
+	i := 0
diff --git a/src/cmd/gofmt/testdata/stdin5.golden b/src/cmd/gofmt/testdata/stdin5.golden
new file mode 100644
index 0000000..31ce6b2
--- /dev/null
+++ b/src/cmd/gofmt/testdata/stdin5.golden
@@ -0,0 +1,3 @@
+//gofmt -stdin
+
+i := 5 // Line comment without newline.
\ No newline at end of file
diff --git a/src/cmd/gofmt/testdata/stdin5.input b/src/cmd/gofmt/testdata/stdin5.input
new file mode 100644
index 0000000..0a7c97d
--- /dev/null
+++ b/src/cmd/gofmt/testdata/stdin5.input
@@ -0,0 +1,3 @@
+//gofmt -stdin
+
+i  :=5// Line comment without newline.
\ No newline at end of file
diff --git a/src/cmd/gofmt/testdata/stdin6.golden b/src/cmd/gofmt/testdata/stdin6.golden
new file mode 100644
index 0000000..ffcea80
--- /dev/null
+++ b/src/cmd/gofmt/testdata/stdin6.golden
@@ -0,0 +1,19 @@
+	//gofmt -stdin
+
+	if err != nil {
+		source := strings.NewReader(`line 1.
+line 2.
+`)
+		return source
+	}
+
+	f := func(hat, tail string) {
+
+		fmt.Println(hat+`
+foo
+
+
+`+tail,
+			"more",
+			"and more")
+	}
diff --git a/src/cmd/gofmt/testdata/stdin6.input b/src/cmd/gofmt/testdata/stdin6.input
new file mode 100644
index 0000000..7833002
--- /dev/null
+++ b/src/cmd/gofmt/testdata/stdin6.input
@@ -0,0 +1,21 @@
+	//gofmt -stdin
+
+	if err != nil {
+		source := strings.NewReader(`line 1.
+line 2.
+`)
+		return source
+	}
+
+	f:=func(  hat, tail string){
+
+
+
+		   fmt.  Println  (   hat+   `
+foo
+
+
+`+ tail  ,
+ "more" ,
+		"and more"   )
+	}
diff --git a/src/cmd/gofmt/testdata/stdin7.golden b/src/cmd/gofmt/testdata/stdin7.golden
new file mode 100644
index 0000000..bbac713
--- /dev/null
+++ b/src/cmd/gofmt/testdata/stdin7.golden
@@ -0,0 +1,19 @@
+															//gofmt -stdin
+
+															if err != nil {
+																source := strings.NewReader(`line 1.
+line 2.
+`)
+																return source
+															}
+
+															f := func(hat, tail string) {
+
+																fmt.Println(hat+`
+		foo
+
+
+	`+tail,
+																	"more",
+																	"and more")
+															}
diff --git a/src/cmd/gofmt/testdata/stdin7.input b/src/cmd/gofmt/testdata/stdin7.input
new file mode 100644
index 0000000..fd772a3
--- /dev/null
+++ b/src/cmd/gofmt/testdata/stdin7.input
@@ -0,0 +1,21 @@
+															//gofmt -stdin
+
+															if err != nil {
+								source := strings.NewReader(`line 1.
+line 2.
+`)
+								return source
+							}
+
+							f:=func(  hat, tail string){
+
+
+
+								   fmt.  Println  (   hat+   `
+		foo
+
+
+	`+ tail  ,
+						 "more" ,
+								"and more"   )
+							}
diff --git a/src/cmd/gofmt/testdata/typealias.golden b/src/cmd/gofmt/testdata/typealias.golden
new file mode 100644
index 0000000..bbbbf32
--- /dev/null
+++ b/src/cmd/gofmt/testdata/typealias.golden
@@ -0,0 +1,24 @@
+package q
+
+import "p"
+
+type _ = int
+type a = struct{ x int }
+type b = p.B
+
+type (
+	_  = chan<- int
+	aa = interface{}
+	bb = p.BB
+)
+
+// TODO(gri) We may want to put the '=' into a separate column if
+// we have mixed (regular and alias) type declarations in a group.
+type (
+	_   chan<- int
+	_   = chan<- int
+	aa0 interface{}
+	aaa = interface{}
+	bb0 p.BB
+	bbb = p.BB
+)
diff --git a/src/cmd/gofmt/testdata/typealias.input b/src/cmd/gofmt/testdata/typealias.input
new file mode 100644
index 0000000..6e49328
--- /dev/null
+++ b/src/cmd/gofmt/testdata/typealias.input
@@ -0,0 +1,24 @@
+package q
+
+import "p"
+
+type _ = int
+type a = struct{ x int }
+type b = p.B
+
+type (
+	_ = chan<- int
+	aa = interface{}
+	bb = p.BB
+)
+
+// TODO(gri) We may want to put the '=' into a separate column if
+// we have mixed (regular and alias) type declarations in a group.
+type (
+	_ chan<- int
+	_ = chan<- int
+	aa0 interface{}
+	aaa = interface{}
+	bb0 p.BB
+	bbb = p.BB
+)
diff --git a/src/cmd/gofmt/testdata/typeswitch.golden b/src/cmd/gofmt/testdata/typeswitch.golden
new file mode 100644
index 0000000..2b1905e
--- /dev/null
+++ b/src/cmd/gofmt/testdata/typeswitch.golden
@@ -0,0 +1,60 @@
+/*
+	Parenthesized type switch expressions originally
+	accepted by gofmt must continue to be rewritten
+	into the correct unparenthesized form.
+
+	Only type-switches that didn't declare a variable
+	in the type switch type assertion and which
+	contained only "expression-like" (named) types in their
+	cases were permitted to have their type assertion parenthesized
+	by go/parser (due to a weak predicate in the parser). All others
+	were rejected always, either with a syntax error in the
+	type switch header or in the case.
+
+	See also issue 4470.
+*/
+package p
+
+func f() {
+	var x interface{}
+	switch x.(type) { // should remain the same
+	}
+	switch x.(type) { // should become: switch x.(type) {
+	}
+
+	switch x.(type) { // should remain the same
+	case int:
+	}
+	switch x.(type) { // should become: switch x.(type) {
+	case int:
+	}
+
+	switch x.(type) { // should remain the same
+	case []int:
+	}
+
+	// Parenthesized (x.(type)) in type switches containing cases
+	// with unnamed (literal) types were never permitted by gofmt;
+	// thus there won't be any code in the wild using this style if
+	// the code was gofmt-ed.
+	/*
+		switch (x.(type)) {
+		case []int:
+		}
+	*/
+
+	switch t := x.(type) { // should remain the same
+	default:
+		_ = t
+	}
+
+	// Parenthesized (x.(type)) in type switches declaring a variable
+	// were never permitted by gofmt; thus there won't be any code in
+	// the wild using this style if the code was gofmt-ed.
+	/*
+		switch t := (x.(type)) {
+		default:
+			_ = t
+		}
+	*/
+}
diff --git a/src/cmd/gofmt/testdata/typeswitch.input b/src/cmd/gofmt/testdata/typeswitch.input
new file mode 100644
index 0000000..8f8cba9
--- /dev/null
+++ b/src/cmd/gofmt/testdata/typeswitch.input
@@ -0,0 +1,60 @@
+/*
+	Parenthesized type switch expressions originally
+	accepted by gofmt must continue to be rewritten
+	into the correct unparenthesized form.
+
+	Only type-switches that didn't declare a variable
+	in the type switch type assertion and which
+	contained only "expression-like" (named) types in their
+	cases were permitted to have their type assertion parenthesized
+	by go/parser (due to a weak predicate in the parser). All others
+	were rejected always, either with a syntax error in the
+	type switch header or in the case.
+
+	See also issue 4470.
+*/
+package p
+
+func f() {
+	var x interface{}
+	switch x.(type) { // should remain the same
+	}
+	switch (x.(type)) { // should become: switch x.(type) {
+	}
+
+	switch x.(type) { // should remain the same
+	case int:
+	}
+	switch (x.(type)) { // should become: switch x.(type) {
+	case int:
+	}
+
+	switch x.(type) { // should remain the same
+	case []int:
+	}
+
+	// Parenthesized (x.(type)) in type switches containing cases
+	// with unnamed (literal) types were never permitted by gofmt;
+	// thus there won't be any code in the wild using this style if
+	// the code was gofmt-ed.
+	/*
+	switch (x.(type)) {
+	case []int:
+	}
+	*/
+
+	switch t := x.(type) { // should remain the same
+	default:
+		_ = t
+	}
+
+	// Parenthesized (x.(type)) in type switches declaring a variable
+	// were never permitted by gofmt; thus there won't be any code in
+	// the wild using this style if the code was gofmt-ed.
+	/*
+	switch t := (x.(type)) {
+	default:
+		_ = t
+	}
+	*/
+}
-- 
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