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match_test.go
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match_test.go
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package gogrep
import (
"fmt"
"go/ast"
"go/importer"
"go/parser"
"go/token"
"go/types"
"strings"
"testing"
"golang.org/x/exp/typeparams"
)
// FIXME: find test case duplicates.
func TestMatchPresetCapture(t *testing.T) {
type captureVars = map[string]string
tests := []struct {
pat string
preset map[string]string
numMatches int
input string
}{
{`$x`, captureVars{"x": "10"}, 1, `10`},
{`$x`, captureVars{"x": "5"}, 0, `10`},
{`$x = $x`, captureVars{"x": "v"}, 1, `v = v`},
{`$x = $x`, captureVars{"x": "v"}, 0, `v = v2`},
{`$x = $x`, captureVars{"x": "v"}, 0, `y = y`},
}
for i := range tests {
test := tests[i]
t.Run(fmt.Sprintf("test%d", i), func(t *testing.T) {
state := NewMatcherState()
fset := token.NewFileSet()
config := CompileConfig{
Fset: fset,
Src: test.pat,
}
for k, s := range test.preset {
n := testParseNode(t, fset, s)
state.CapturePreset = append(state.CapturePreset, CapturedNode{
Name: k,
Node: n,
})
}
pat, _, err := Compile(config)
if err != nil {
t.Fatalf("compile `%s`: %v", test.pat, err)
}
target := testParseNode(t, token.NewFileSet(), test.input)
matches := 0
testAllMatches(pat, &state, target, func(m MatchData) {
matches++
})
if matches != test.numMatches {
t.Fatalf("test `%s`:\ntarget: `%s`\nhave: %v\nwant: %v",
test.pat, test.input, matches, test.numMatches)
}
})
}
}
func TestMatchPos(t *testing.T) {
tests := []struct {
pat string
input string
matched string
}{
{
`for $_, $v := range $xs`,
`package p; func _() { for _, v := range elems {} }`,
`for _, v := range elems`,
},
{
`for $_, $v := range $xs`,
`package p
func _() {
for _, v := range f()[:] {
println(v)
}
}
`,
`for _, v := range f()[:]`,
},
{
`range $x`,
`package p; func _() { for range xs {} }`,
`range xs`,
},
{
`range $x`,
`package p; func _() { for i := range xs[:] {} }`,
`range xs[:]`,
},
{
`range $x`,
`package p; func _() { for i, v := range f() {} }`,
`range f()`,
},
{
`range $x`,
`package p; func _() { for i = range xs[:] {} }`,
`range xs[:]`,
},
{
`range $x`,
`package p; func _() { for i, v = range f() {} }`,
`range f()`,
},
}
for i := range tests {
test := tests[i]
t.Run(fmt.Sprintf("test%d", i), func(t *testing.T) {
state := NewMatcherState()
config := CompileConfig{Fset: token.NewFileSet(), Src: test.pat}
pat, _, err := Compile(config)
if err != nil {
t.Fatal(err)
}
fset := token.NewFileSet()
target := testParseNode(t, fset, test.input)
matched := ""
testAllMatches(pat, &state, target, func(m MatchData) {
from := fset.Position(m.Node.Pos()).Offset
to := fset.Position(m.Node.End()).Offset
matched = test.input[from:to]
})
if matched != test.matched {
t.Fatalf("result mismatch:\nhave: %q\nwant: %q\npattern: %s\ninput: %s",
matched, test.matched, test.pat, test.input)
}
})
}
}
func TestMatchCapture(t *testing.T) {
tests := []struct {
pat string
input string
capture string
}{
{`import $i`, `package p; import "fmt"`, `i:"fmt"`},
{`import $i`, `package p; import ("fmt")`, `i:"fmt"`},
{`import $i`, `package p; import ("fmt"; "strings")`, `i:"fmt"; "strings"`},
{`import $imports`, `package p; import ("fmt"; "strings")`, `imports:"fmt"; "strings"`},
{`import $imports`, `package p; import (crand "crypto/rand"; "strings")`, `imports:crand "crypto/rand"; "strings"`},
{
`range $x`,
`package p; func _() { for i, x := range data[0] { println(i, x) } }`,
`x:data[0]`,
},
{
`range $x`,
`package p; func _() { for range data[0] {} }`,
`x:data[0]`,
},
}
for i := range tests {
test := tests[i]
t.Run(fmt.Sprintf("test%d", i), func(t *testing.T) {
state := NewMatcherState()
config := CompileConfig{Fset: token.NewFileSet(), Src: test.pat}
pat, _, err := Compile(config)
if err != nil {
t.Fatal(err)
}
fset := token.NewFileSet()
target := testParseNode(t, fset, test.input)
var capture []string
testAllMatches(pat, &state, target, func(m MatchData) {
for _, c := range m.Capture {
from := fset.Position(c.Node.Pos()).Offset
to := fset.Position(c.Node.End()).Offset
capture = append(capture, c.Name+":"+test.input[from:to])
}
})
have := strings.Join(capture, ", ")
want := test.capture
if have != want {
t.Fatalf("capture mismatch:\nhave: %s\nwant: %s\npattern: %s\ninput: %s",
have, want, test.pat, test.input)
}
})
}
}
func TestMatchWithTypes(t *testing.T) {
tests := []struct {
pat string
numMatches int
}{
{`fmt.Sprintf($*_)`, 2},
{`fmt.$_($*_)`, 2},
{`rand.Read($_)`, 1},
{`astequal.Expr($*_)`, 1},
}
fileSrc := `package example
import (
"fmt"
"github.com/go-toolsmith/astequal"
crand "crypto/rand"
"math/rand"
)
func testFunc(format string, args []interface{}) {
_ = fmt.Sprintf("%d", 1)
_ = fmt.Sprintf(format, args...)
_ = astequal.Expr(nil, nil)
_, _ = crand.Read(nil)
_, _ = rand.Read(nil)
_, _ = rand.Read(nil)
}
type dummy struct{}
func (dummy) Expr(x, y interface{}) bool { return false }
func (dummy) Read(b []byte) (int, error) { return 0, nil }
func _() {
var astequal dummy
_ = astequal.Expr(nil, nil)
_ = astequal.Expr(1, nil)
_ = astequal.Expr(1, 2)
}
func _() {
var rand dummy
_, _ = rand.Read(nil)
}
`
fset := token.NewFileSet()
f, err := parser.ParseFile(fset, "file.go", fileSrc, 0)
if err != nil {
t.Fatal(err)
}
typesInfo := &types.Info{
Types: make(map[ast.Expr]types.TypeAndValue),
Defs: make(map[*ast.Ident]types.Object),
Uses: make(map[*ast.Ident]types.Object),
}
typechecker := &types.Config{
Importer: importer.ForCompiler(fset, "source", nil),
}
_, err = typechecker.Check("example", fset, []*ast.File{f}, typesInfo)
if err != nil {
t.Fatal(err)
}
customImports := map[string]string{
"astequal": "github.com/go-toolsmith/astequal",
"rand": "crypto/rand",
}
for i := range tests {
test := tests[i]
t.Run(fmt.Sprintf("test%d", i), func(t *testing.T) {
state := NewMatcherState()
state.Types = typesInfo
fset := token.NewFileSet()
testPattern := test.pat
config := CompileConfig{
Fset: fset,
Src: testPattern,
WithTypes: true,
Imports: customImports,
}
pat, _, err := Compile(config)
if err != nil {
t.Errorf("compile `%s`: %v", test.pat, err)
return
}
matches := 0
testAllMatches(pat, &state, f, func(m MatchData) {
matches++
})
if matches != test.numMatches {
t.Errorf("test `%s`:\nhave: %v\nwant: %v",
test.pat, matches, test.numMatches)
}
})
}
}
func TestMatch(t *testing.T) {
strict := func(s string) string {
return "STRICT " + s
}
isStrict := func(s string) bool {
return strings.HasPrefix(s, "STRICT ")
}
unwrapPattern := func(s string) string {
s = strings.TrimPrefix(s, "STRICT ")
return s
}
type testCase struct {
pat string
numMatches int
input string
}
tests := []testCase{
{`123`, 1, `123`},
{`123`, 0, `12`},
{`2.71828i`, 1, `2.71828i`},
{`2.71828i`, 0, `2.71820i`},
{`'a'`, 1, `'a'`},
{`'a'`, 0, `'b'`},
{`'✓'`, 1, `'✓'`},
{`"ab"`, 1, `"ab"`},
{`"ab"`, 0, `"foo"`},
{`true`, 1, `true`},
{`false`, 0, `true`},
{`($x)`, 1, `(a + b)`},
{`($x)`, 0, `a + b`},
{`$x`, 1, `123`},
{`$_`, 1, `123`},
{`;`, 1, `;`},
{`;`, 0, `1`},
// In strict mode, differently spelled literals won't match.
{strict(`"a"`), 1, `"a"`},
{strict("`a`"), 1, "`a`"},
{strict(`"a"`), 0, "`a`"},
{strict("`a`"), 0, `"a"`},
{strict("`a`"), 0, `"b"`},
{strict(`'✓'`), 0, `'\u2713'`},
{strict(`'\n'`), 0, `'\x0a'`},
{strict(`0x0`), 0, `0`},
{strict(`2748i`), 1, `2748i`},
{strict(`2748i`), 0, `2740i`},
{strict(`4.5`), 1, `4.5`},
{strict(`0.01`), 0, `.01`},
// In non-strict mode, these literals can match.
{`"aa"`, 1, "`aa`"},
{`'\n'`, 1, `'\x0a'`},
{`0x0`, 1, `0`},
{`3`, 1, `0b11`},
{`0.01`, 1, `.01`},
{`'a'`, 0, `"a"`},
{`'✓'`, 0, `10003`},
{`'✓'`, 1, `'\u2713'`},
// Binary op.
{strict(`1 + 2`), 1, `1 + 2`},
{`$_`, 3, `1 * 2`},
{`x == y`, 1, `x == y`},
{`x == y`, 0, `x == x`},
{`x == y`, 0, `x != y`},
{`x != y`, 1, `x != y`},
{`$x + $x`, 1, `x + x`},
{`$x + $x`, 0, `x + y`},
{`$x + $x`, 0, `x + 0`},
{`$x + $x`, 0, `foo(a) + foo(b)`},
{`$x + $x`, 1, `foo(a) + foo(a)`},
// Unary op.
{`+x`, 1, `+x`},
{`+x`, 0, `+y`},
{`-someConst`, 1, `- someConst`},
{`*someVar`, 1, `* someVar`},
{`-someConst`, 0, `someConst`},
{`*someVar`, 0, `someVar`},
// Forcing node to be a statement.
{`append($*_);`, 1, `{ f(); append(x, a) }`},
{`append($*_);`, 0, `{ f(); x = append(x, a) }`},
// Call expr.
{`f(1, 2, "foo")`, 1, `f(1, 2, "foo")`},
{`f(1, 2, "foo")`, 0, `g(1, 2, "foo")`},
{`f(1, 2, "foo")`, 0, `f(1, 2, "bar")`},
{`f(1, 2, "foo")`, 0, `f(1, 2)`},
{`f(1, 2)`, 0, `f(1, 2, "foo")`},
{`print($*x)`, 1, `print()`},
{`print($*x)`, 1, `print(a, b)`},
{`print($*_)`, 1, `print()`},
{`print($*_)`, 1, `print(a, b)`},
{`print($*x, $y, $*z)`, 0, `print()`},
{`print($*x, $y, $*z)`, 1, `print(a)`},
{`print($*x, $y, $*z)`, 1, `print(a, b, c)`},
{`print($*_, x, $*_)`, 1, `print(x)`},
{`print($*_, f(), $*_)`, 1, `print(f())`},
{`print($*_, f(), $*_)`, 1, `print(1, f())`},
{`print($*_, f(), $*_)`, 1, `print(1, 2, f(), 3)`},
{`print($*_, f(), $*_)`, 1, `print(f(), 1)`},
{`print($*_, f($*args), $*_)`, 1, `print(f())`},
{`print($*_, f($*args), $*_)`, 1, `print(f(1))`},
{`print($*_, f($*args), $*_)`, 1, `print(f(1, 2), 3)`},
{`f(1, $*_, 2)`, 1, `f(1, 2)`},
{`f(1, $*_, 2)`, 1, `f(1, "x", 2)`},
{`f(1, $*_, 2)`, 1, `f(1, "x", "y", 2)`},
{`f(1, $*_, 2)`, 0, `f(1, "x", "y")`},
{`f(1, $*_, 2)`, 0, `f(1)`},
{`foo($x, $x)`, 0, `foo(1, 2)`},
{`foo($_, $_)`, 1, `foo(1, 2)`},
{`foo($x, $y, $y)`, 1, `foo(1, 2, 2)`},
{`foo($x, $y, $y)`, 0, `foo(1, 2, 3)`},
{`$x.Method()`, 1, `a.Method()`},
{`$x.Method()`, 1, `a.b.Method()`},
{`$x.Method()`, 0, `a.b.Method`},
{`$x.Method()`, 0, `a.b.Method2()`},
{`x.Method()`, 0, `y.Method2()`},
{`$x.Method()`, 0, `a.Method(1)`},
{`f($*_)`, 1, `f(xs...)`},
{`f($*_)`, 1, `f(1, xs...)`},
{`f($*_)`, 1, `f(1, 2, xs...)`},
{`f($_, $*_)`, 1, `f(1, 2, xs...)`},
{`f($*_, $_)`, 0, `f(1, 2, xs...)`},
{`f($*_, xs)`, 0, `f(1, 2, xs...)`},
{`f($*_, xs...)`, 1, `f(1, 2, xs...)`},
{`fmt.Sprintf($_, $_...)`, 1, `fmt.Sprintf(format, args...)`},
{`fmt.Sprintf($_, $args...)`, 1, `fmt.Sprintf(format, args...)`},
{`fmt.Sprintf($_, $args...)`, 1, `fmt.Sprintf(f, a...)`},
{`fmt.Sprintf($_, $args...)`, 0, `fmt.Sprintf(f, a)`},
{`fmt.Sprintf($_, $args...)`, 0, `fmt.Sprintf(f)`},
{`fmt.Sprintf($_, $args...)`, 0, `fmt.Sprintf(f, a, b)`},
{`fmt.Sprintf($_, $args)`, 0, `fmt.Sprintf(f, a...)`},
{`$fmt.$_($*_)`, 1, `fmt.Sprintf("%d", 1)`},
// OK: trailing $*_ can match variadic calls.
{`f($*_)`, 1, `f(xs...)`},
{`f($*_)`, 1, `f(1, xs...)`},
{`f($_, $*_)`, 1, `f(1, xs...)`},
{`f($_, $*_)`, 1, `f(1, 2, xs...)`},
{`f($_, $_, $*_)`, 1, `f(1, 2, xs...)`},
{`f($_, $_, $*_)`, 1, `f(1, 2, 3, xs...)`},
{`f($*_, $_, $*_)`, 1, `f(1)`},
// TODO: the case below should probably be rejected.
{`f($*_, $_, $*_)`, 1, `f(xs...)`},
// It doesn't allow to match a variadic call in the following cases.
{`f($_, $*_)`, 0, `f(xs...)`},
{`f($_, $_, $*_)`, 0, `f(1, xs...)`},
// Selector expr.
{`$x.Field`, 1, `a.Field`},
{`$x.Field`, 1, `b.Field`},
{`$x.Field`, 0, `a.field`},
{`a.b`, 1, `a.b.c`},
{`b.c`, 0, `a.b.c`},
{`$x.c`, 1, `a.b.c`},
{`a.$x`, 1, `a.b.c`},
// Index expr.
{`$x[0][1]`, 1, `x[0][1]`},
{`$x[0][1]`, 1, `x[10][0][1]`},
{`$x[0][1]`, 0, `x[0][10]`},
{`$x[len($x)-1]`, 1, `a[len(a)-1]`},
{`$x[len($x)-1]`, 0, `a[len(b)-1]`},
// Slice expr.
{`x[:]`, 1, `x[:]`},
{`x[:]`, 0, `y[:]`},
{`x[:]`, 0, `x[1:]`},
{`x[:]`, 0, `x[:1]`},
{`x[:y]`, 1, `x[:y]`},
{`x[:y]`, 0, `x[:z]`},
{`x[:y]`, 0, `z[:y]`},
{`x[:y]`, 0, `x[:y:z]`},
{`$x[:$y]`, 1, `a[:1]`},
{`$x[:$y]`, 0, `a[:]`},
{`x[y:]`, 1, `x[y:]`},
{`x[y:]`, 0, `z[y:]`},
{`x[y:]`, 0, `x[z:]`},
{`$x[$y:]`, 1, `a[1:]`},
{`$x[$y:]`, 0, `a[:]`},
{`x[y:z]`, 1, `x[y:z]`},
{`x[y:z]`, 0, `_[y:z]`},
{`x[y:z]`, 0, `x[_:z]`},
{`x[y:z]`, 0, `x[y:_]`},
{`x[y:z]`, 0, `x[y:]`},
{`x[:y:z]`, 1, `x[:y:z]`},
{`x[:y:z]`, 0, `_[:y:z]`},
{`x[:y:z]`, 0, `x[:_:z]`},
{`x[:y:z]`, 0, `x[:y:_]`},
{`x[:y:z]`, 0, `x[0:y:z]`},
{`x[:y:z]`, 0, `x[:y]`},
{`x[5:y:z]`, 1, `x[5:y:z]`},
{`x[5:y:z]`, 0, `_[5:y:z]`},
{`x[5:y:z]`, 0, `x[_:y:z]`},
{`x[5:y:z]`, 0, `x[5:_:z]`},
{`x[5:y:z]`, 0, `x[5:y:_]`},
{`x[5:y:z]`, 0, `x[0:y:z]`},
{`x[5:y:z]`, 0, `x[5:y]`},
{`x[$*_:]`, 1, `x[:]`},
{`x[$*_:]`, 1, `x[1:]`},
{`x[$*_:]`, 0, `x[1:2]`},
{`x[:$*_]`, 1, `x[:]`},
{`x[:$*_]`, 1, `x[:2]`},
{`x[:$*_]`, 0, `x[1:2]`},
{`x[$*_:$*_]`, 1, `x[:]`},
{`x[$*_:$*_]`, 1, `x[1:]`},
{`x[$*_:$*_]`, 1, `x[:2]`},
{`x[$*_:$*_]`, 1, `x[1:2]`},
{`x[$*_:$*_]`, 0, `x[1:2:2]`},
{`x[$*_:$*_:$*_]`, 1, `x[:]`},
{`x[$*_:$*_:$*_]`, 1, `x[1:]`},
{`x[$*_:$*_:$*_]`, 1, `x[:2]`},
{`x[$*_:$*_:$*_]`, 1, `x[1:2]`},
{`x[$*_:$*_:$*_]`, 1, `x[1:2:2]`},
{`x[$*y:$*y]`, 1, `x[:]`},
{`x[$*y:$*y]`, 1, `x[1:1]`},
{`x[$*y:$*y]`, 0, `x[1:0]`},
// Composite literals.
{`[]int{1, $x, $x}`, 1, `[]int{1, 2, 2}`},
{`[]int{1, $x, $x}`, 0, `[]byte{1, 2, 2}`},
{`[]int{1, $x, $x}`, 0, `[2]int{1, 2, 2}`},
{`[]int{1, $x, $x}`, 0, `[]int{1, 2}`},
{`[]string{$*_}`, 1, `[]string{"x", "y"}`},
{`[][]int{{$x, $y}}`, 1, `[][]int{{f(), 1}}`},
{`[][]int{{$x, $y}}`, 0, `[][]int{[]int{f(), 1}}`},
{`[][]int{[]int{$x, $y}}`, 1, `[][]int{[]int{f(), 1}}`},
{`[][]int{[]int{$x, $y}}`, 0, `[][]int{{f(), 1}}`},
{`[]float64{$x}`, 1, `[]float64{3}`},
{`[2]bool{$x, 0}`, 0, `[2]bool{3, 1}`},
{`someStruct{fld: $x}`, 0, `someStruct{fld: a, fld2: b}`},
{`map[int]int{1: $x}`, 1, `map[int]int{1: a}`},
{`map[int]int{1: $x}`, 0, `map[int]byte{1: a}`},
// Type assert.
{`$x.([]string)`, 1, `a.([]string)`},
{`$x.(string)`, 0, `a.(int)`},
{`$x.($_)`, 1, `a.(b)`},
{`$x.($x)`, 1, `int.(int)`},
{`$x.($x)`, 0, `int.([]string)`},
{`x.(string)`, 0, `y.(string)`},
// Type expr.
{`[8]$x`, 1, `[8]int{4: 1}`},
{`struct{}`, 1, `type _ struct{}`},
{`struct{}`, 1, `struct{}{}`},
{`struct{}`, 0, `type _ struct{x int}`},
{`struct{field $t}`, 1, `struct{field int}{}`},
{`struct{field $t}`, 1, `struct{field int}{}`},
{`struct{field $t}`, 0, `struct{other int}{}`},
{`struct{field $t}`, 0, `(struct{f1, f2 int}{})`},
{`struct{$*_}`, 1, `struct{}{}`},
{`struct{$*_}`, 1, `struct{x int}{}`},
{`struct{$*_}`, 1, `struct{x, y int}{}`},
{`struct{$*_}`, 1, `struct{x int; y float64}{}`},
{`struct{$*_}`, 0, `1`},
{`struct{$_ $x; $_ $x}`, 1, `struct{x int; y int}{}`},
{`struct{$_ $x; $_ $x}`, 0, `struct{x int; y string}{}`},
{`struct{$*_; $_ $x; $_ $x; $*_}`, 1, `struct{x int; y int}{}`},
{`struct{$*_; $_ $x; $_ $x; $*_}`, 1, `struct{x int; y int; z string}{}`},
{`struct{$*_; $_ $x; $_ $x; $*_}`, 0, `struct{x string; y int; z string}{}`},
{`struct{$x; $x}`, 1, `struct{x int; x int}{}`},
{`struct{$x; $x}`, 0, `struct{x int; y int}{}`},
{`struct{$x; $x}`, 0, `struct{x int; x string}{}`},
{`struct{$x; $x}`, 0, `struct{x int}{}`},
{`struct{$_}`, 1, `struct{io.Reader}{}`},
{`struct{$_}`, 0, `struct{}{}`},
{`struct{$_}`, 0, `struct{x int}{}`},
{`struct{$_ $_}`, 1, `struct{x int}{}`},
{`struct{$_, $_ $_}`, 1, `struct{x, y int}{}`},
{`struct{$_, $_ $_}`, 0, `struct{x int}{}`},
{`struct{$_, $_ $_}`, 0, `struct{x int; y int}{}`},
{`var x struct{$x}; var y $x`, 1, `{ var x struct{io.Reader}; var y io.Reader }`},
{`var x struct{$_ $x}; var y $x`, 1, `{ var x struct{r io.Reader}; var y io.Reader }`},
{`var x struct{$x}; var y $x`, 0, `{ var x struct{io.Writer}; var y io.Reader }`},
{`var x struct{$_ $x}; var y $x`, 0, `{ var x struct{r io.Writer}; var y io.Reader }`},
{`var x struct{$_ $x}; var y $x`, 0, `{ var x struct{io.Reader}; var y io.Reader }`},
{`interface{$x() int}`, 1, `(interface{i() int})(nil)`},
{`interface{}`, 1, `interface{}(nil)`},
{`interface{}`, 1, `interface{}(nil)`},
{`interface{}`, 0, `interface{io.Reader}(nil)`},
{`interface{}`, 0, `interface{Int() int}(nil)`},
{`interface{Int() int}`, 1, `interface{Int() int}(nil)`},
{`interface{Int() int}`, 0, `interface{String() int}(nil)`},
{`interface{Int() int}`, 0, `interface{Int() string}(nil)`},
{`interface{Int() int}`, 0, `interface{}(nil)`},
{`interface{$_($x) $x}`, 1, `interface{Foo(int) int}(nil)`},
{`interface{$_($x) $x}`, 0, `interface{Foo() int}(nil)`},
{`interface{$_($x) $x}`, 0, `interface{Foo(int)}(nil)`},
{`interface{$_($x) $x}`, 0, `interface{Foo(string) int}(nil)`},
{`interface{$*_; String() string; $*_}`, 1, `interface{String() string}(nil)`},
{`interface{$*_; String() string; $*_}`, 1, `interface{Int() int; String() string}(nil)`},
{`interface{$*_; String() string; $*_}`, 1, `interface{String() string; Int() int}(nil)`},
{`interface{$*_; String() string; $*_}`, 1, `interface{Float() float64; String() string; Int() int}(nil)`},
{`chan<- int`, 1, `make(chan<- int)`},
{`chan<- int`, 0, `make(chan <-string)`},
{`chan<- int`, 0, `make(chan int)`},
{`chan<- int`, 0, `make(<-chan int)`},
{`chan $x`, 1, `new(chan bool)`},
{`chan $x`, 0, `(chan<- bool)(nil)`},
// Key-value expr.
{`"a": 1`, 1, `map[string]int{"a": 1}`},
{`"a": 1`, 0, `map[string]int{"a": 0}`},
{`"a": 1`, 0, `map[string]int{"b": 1}`},
{`"a": 1`, 0, `map[string]int{}`},
{`$x: 1`, 1, `map[string]int{"x": 1}`},
{`$x: 1`, 1, `map[string]int{"y": 1}`},
{`$x: 1`, 0, `map[string]int{"z": 2}`},
{`"a": $x`, 1, `map[string]int{"a": 1}`},
{`"a": $x`, 1, `map[string]int{"a": 2}`},
{`"a": $x`, 0, `map[string]int{"b": 3}`},
// Func lit.
{`func () {}`, 1, `func () {}`},
{`func () {}`, 0, `func () int {}`},
{`func () {}`, 0, `func (int) {}`},
{`func () {}`, 0, `func (x int) {}`},
{`func () {}`, 0, `func (int, int) {}`},
{`func (x int) {}`, 1, `func (x int) {}`},
{`func (x int) {}`, 0, `func (y int) {}`},
{`func (x int) {}`, 0, `func (x string) {}`},
{`func (int) {}`, 1, `func (int) {}`},
{`func (int) {}`, 0, `func (string) {}`},
{`func (int) {}`, 0, `func () {}`},
{`func (int) {}`, 0, `func (int, int) {}`},
{`func (int) {}`, 0, `func (int) int {}`},
{`func (int, int) {}`, 1, `func (int, int) {}`},
{`func (int, int) {}`, 0, `func (int) {}`},
{`func (int, int) {}`, 0, `func (x int, y int) {}`},
{`func (int, int) {}`, 0, `func (string, int) {}`},
{`func (int, int) {}`, 0, `func (int, string) {}`},
{`func (int, int) {}`, 0, `func (int, int) int {}`},
{`func (x, y int) int {}`, 1, `func (x, y int) int {}`},
{`func (x, y int) int {}`, 0, `func (x int, y int) int {}`},
{`func (x, y int) int {}`, 0, `func (x, y string) int {}`},
{`func (x, y int) int {}`, 0, `func (x, y int) string {}`},
{`func (x, y int) int {}`, 0, `func (x, y int) (int, int) {}`},
{`func (x, y int) int {}`, 0, `func (y, x int) int {}`},
{`func () (int, int) {}`, 1, `func () (int, int) {}`},
{`func () (int, int) {}`, 0, `func () int {}`},
{`func () (int, int) {}`, 0, `func () (string, int) {}`},
{`func () (int, int) {}`, 0, `func () (x int, y int) {}`},
{`func () int { return 1 }`, 1, `func () int { return 1 }`},
{`func () int { return 1 }`, 0, `func () int { return 0 }`},
{`func ($t, $t) {}`, 1, `func (int, int) {}`},
{`func ($t, $t) {}`, 0, `func (string, int) {}`},
{`func ($t, $t) {}`, 0, `func (int, string) {}`},
{`func($s string) { print($s) }`, 1, `func(a string) { print(a) }`},
{`func(x ...int) {}`, 1, `func(x ...int) {}`},
{`func(x ...int) {}`, 0, `func(x int) {}`},
{`func(x ...int) {}`, 0, `func(y ...int) {}`},
{`func(x ...int) {}`, 0, `func(x ...string) {}`},
{`func($x ...$t) {}`, 1, `func(a ...int) {}`},
// Func lit - non-strict mode.
// TODO: reject these in strict mode.
{`func () (int) {}`, 1, `func () int {}`},
{`func () int {}`, 1, `func () (int) {}`},
// Assign stmt.
{`$x = $y`, 1, `a = b`},
{`x := y`, 0, `x = y`},
{`$x := $y`, 0, `a, b := c()`},
{`$x := $y`, 0, `a, b = c()`},
{`$x := $y`, 0, `a, b := c, d`},
{`$*x = $*x`, 1, `x, y = x, y`},
{`$*x = $*x`, 0, `x, y = 0, 0`},
{`$*_ = $*_`, 1, `x = 1`},
{`$*_ = $*_`, 1, `x, y = 1, 2`},
// Block stmt.
{`{ $x }`, 1, `{ a() }`},
{`{ $x }`, 0, `{ a(); b() }`},
{`{}`, 1, `package p; func f() {}`},
{`{ $*_ }`, 1, `{ x; y }`},
{`{ x; y }`, 1, `{ x; y }`},
{`{ x; y; z }`, 1, `{ x; y; z }`},
{`{ x; y }`, 0, `{ y; x }`},
{`{ x; y }`, 0, `{ x }`},
{`{ x; f(); y; g() }`, 1, `{ x; f(); y; g() }`},
{`{ x; $*_; g() }`, 1, `{ x; f(); y; g() }`},
{`{ $*_; g() }`, 1, `{ x; f(); y; g() }`},
{`{ x; $*_ }`, 1, `{ x; f(); y; g() }`},
{`{ x; $*_ }`, 1, `{ x; y }`},
{`{ x; $*_ }`, 0, `{ y; x }`},
{`{ $*_; y }`, 1, `{ x; y }`},
{`{ $*_; y }`, 0, `{ y; x }`},
{`{ $*_; f(); $*_ }`, 1, `{ f() }`},
{`{ $*_; f(); $*_ }`, 1, `{ g(); f() }`},
{`{ $*_; x; $*_ }`, 1, `{ y; x; y }`},
{`{ $*_; f(); $*_ }`, 1, `{ g(); g(); f() }`},
{`{ $*_; f(); $*_ }`, 0, `{ g(); g() }`},
{`{ $*_; f(); $*_ }`, 0, `{}`},
{`{ $*_; return nil }`, 1, `{ return nil }`},
{`{ $*_; return nil }`, 1, `{ a(); b(); return nil }`},
// Labeled stmt.
{`foo: if x {}`, 1, `foo: if x {}`},
{`foo: if x {}`, 0, `foo: if y {}`},
{`foo: if x {}`, 0, `bar: if y {}`},
{`$label: if f() {}`, 1, `foo: if f() {}`},
{`$label: if f() {}`, 1, `bar: if f() {}`},
{`$l: return 1; $l: return 2`, 1, `{ x: return 1; x: return 2 }`},
{`$l: return 1; $l: return 2`, 0, `{ x: return 1; y: return 2 }`},
// Send stmt.
{`x <- 1`, 1, `x <- 1`},
{`x <- $v`, 0, `y <- 0`},
{`x <- 1`, 0, `x <- 2`},
// Go stmt.
{`go f(1)`, 1, `go f(1)`},
{`go f(1)`, 0, `go g(1)`},
{`go func() { $x }()`, 1, `go func() { a() }()`},
{`go func() { $x }()`, 0, `go a()`},
// Defer stmt.
{`defer f(1)`, 1, `defer f(1)`},
{`defer f(1)`, 0, `defer g(1)`},
{`defer func() { $x }()`, 1, `defer func() { a() }()`},
{`defer func() { $x }()`, 0, `defer a()`},
// If stmt.
{`if $x != nil { $y }`, 1, `if p != nil { p.foo() }`},
{`if $x { $y }`, 0, `if a { b() } else { c() }`},
{`if $x != nil { $y }`, 1, `if a != nil { return a }`},
{`if $_; cond {}`, 0, `if cond {}`},
{`if $_; cond {}`, 1, `if init; cond {}`},
{`if $x; cond {}`, 0, `if cond {}`},
{`if $x; cond {}`, 1, `if init; cond {}`},
{`if $x {} else if $x {}`, 1, `if cond {} else if cond {}`},
{`if $x {} else if $x {}`, 0, `if cond {} else if cond2 {}`},
{`if $x {} else if $x {}`, 0, `if cond {} else {}`},
{`if $x {} else if $x {}`, 0, `if cond { f() } else {}`},
{`if $x {} else if $x {}`, 0, `if cond {} else { f() }`},
{`if $x {} else if $x {}`, 0, `if cond {} else if cond { f() }`},
{
`if len($xs) != 0 { for _, $x = range $xs { $*_ } }`,
1,
`if len(xs) != 0 { for _, v = range xs { println(v) } }`,
},
{
`if len($xs) != 0 { for _, $x := range $xs { $*_ } }`,
0,
`if len(xs) != 0 { for _, v = range xs { println(v) } }`,
},
// If stmt - optional matching.
{`if $*_; cond {}`, 1, `if cond {}`},
{`if $*_; cond {}`, 1, `if init; cond {}`},
{`if $*x; cond {}`, 1, `if cond {}`},
{`if $*x; cond {}`, 1, `if init; cond {}`},
{`if $*_ {}`, 1, `if cond {}`},
{`if $*_ {}`, 1, `if init; cond {}`},
{`if $*x {}; if $*x {}`, 1, `for cond() { if a(); b {}; if a(); b {} }`},
{`if $*x {}; if $*x {}`, 1, `{ if a {}; if a {} }`},
{`if $*x {}; if $*x {}`, 0, `{ if a {}; if b {} }`},
{`if $*x {}; if $*x {}`, 0, `for cond() { if a(); b {}; if b {} }`},
{`if $*x {} else if $*x {}`, 1, `{ if a {} else if a {} }`},
{`if $*x {} else if $*x {}`, 0, `{ if a {} else if b {} }`},
{`if $*_ {} else {}`, 0, `if a(); b {}`},
{`if $*_; $_ {} else {}`, 1, `if a() {} else {}`},
{`if $*_; $_ {} else {}`, 1, `if a(); b {} else {}`},
{`if $*_ {} else {}`, 1, `if a(); b {} else {}`},
{`if $*_ {} else {}`, 1, `if a() {} else {}`},
{`if a(); $*_ {}`, 0, `if b {}`},
{`if $_ { $*_ }`, 1, `if cond {}`},
{`if $_ { $*_ }`, 1, `if cond { f() }`},
// Switch stmt.
{`switch {}`, 1, `switch {}`},
{`switch {}`, 0, `switch tag {}`},
{`switch tag {}`, 1, `switch tag {}`},
{`switch tag {}`, 0, `switch {}`},
{`switch tag {}`, 0, `switch init; tag {}`},
{`switch tag {}`, 0, `switch tag2 {}`},
{`switch init; {}`, 1, `switch init; {}`},
{`switch init; {}`, 0, `switch init2; {}`},
{`switch init; {}`, 0, `switch init; tag {}`},
{`switch init; {}`, 0, `switch {}`},
{`switch init; tag {}`, 1, `switch init; tag {}`},
{`switch init; tag {}`, 0, `switch init2; tag {}`},
{`switch init; tag {}`, 0, `switch init; tag2 {}`},
{`switch init; tag {}`, 0, `switch {}`},
{`switch init; tag {}`, 0, `switch ; tag {}`},
{`switch init; tag {}`, 0, `switch init; {}`},
{`switch $_ {}`, 1, `switch x {}`},
{`switch $_ {}`, 0, `switch x; y {}`},
{`switch $_; $_ {}`, 0, `switch x {}`},
{`switch $_; $_ {}`, 1, `switch x; y {}`},
{`switch { $*_; case x: y() }`, 1, `switch { case x: y() }`},
{`switch { $*_; case x: y() }`, 1, `switch { case v: g(); case x: y() }`},
{`switch { $*_; case $*_: $*a }`, 1, `switch { case x: y() }`},
{`switch x {case 4: x}`, 1, `switch x {case 4: x}`},
{`switch x {case 4: x}`, 0, `switch y {case 4: x}`},
{`switch x {case 4: x}`, 0, `switch x {case 5: x}`},
{`switch {$_}`, 1, `switch {case 5: x}`},
{`switch x {$_}`, 1, `switch x {case 5: x}`},
{`switch x {$*_}`, 1, `switch x {case 5: x}`},
{`switch x {$*_}`, 1, `switch x {}`},
{`switch x {$*_}`, 1, `switch x {case 1: a; case 2: b}`},
{`switch {$a; $a}`, 1, `switch {case true: a; case true: a}`},
{`switch {$a; $a}`, 0, `switch {case true: a; case true: b}`},
{`switch x {default: f()}`, 1, `switch x {default: f()}`},
{`switch x {default: f()}`, 0, `switch x {default: g()}`},
{`switch x {default: f()}`, 0, `switch x {case 10: f()}`},
{`switch x := y.(z); x {}`, 1, `switch x := y.(z); x {}`},
{`switch x := y.(z); x {}`, 0, `switch y := y.(z); x {}`},
{`switch x := y.(z); x {}`, 0, `switch x {}`},
{`switch x {case x, y: f(x, y)}`, 1, `switch x {case x, y: f(x, y)}`},
{`switch x {case x, y: f(x, y)}`, 0, `switch x {case x: f(x, y)}`},
{`switch x {case x, y: f(x, y)}`, 0, `switch x {case x, _: f(x, y)}`},
{`switch x {case x, y: f(x, y)}`, 0, `switch x {case x, y: f(x, _)}`},
// Switch stmt - optional matching.
{`switch $*x {}`, 1, `switch a {}`},
{`switch $*x {}`, 1, `switch {}`},
{`switch $*_; b {}`, 1, `switch b := f(); b {}`},
{`switch $*_; b {}`, 0, `switch b := f(); c {}`},
// TODO {`switch $*x {}`, 1, `switch a(); b {}`},
// TODO {`switch $*x {}; switch $*x {}`, 1, `{ switch a(); b {}; switch a(); b {} }`},
{`switch $*x {}; switch $*x {}`, 0, `{ switch a(); b {}; switch b {} }`},
{`switch a(); $*_ {}`, 0, `for b {}`},
// Type switch stmt.
{`switch x := $x.(type) {}`, 1, `switch x := y.(type) {}`},
{`switch x := $x.(type) {}`, 1, `switch x := xs[0].(type) {}`},
{`switch $x := $x.(type) {}`, 1, `switch x := x.(type) {}`},
{`switch $x := $x.(type) {}`, 0, `switch y := x.(type) {}`},
{`switch $x.(type) {}`, 1, `switch v.(type) {}`},
{`switch $*_; x.(type) {}`, 1, `switch x.(type) {}`},
{`switch $*_; x.(type) {}`, 1, `switch init(); x.(type) {}`},
{`switch $*_; x.(type) {}`, 0, `switch y.(type) {}`},
// Select stmt.
{`select {$*_}`, 1, `select {case <-x: a}`},
{`select {$*_}`, 1, `select {}`},
{`select {$a; $a}`, 1, `select {case <-x: a; case <-x: a}`},
{`select {$a; $a}`, 0, `select {case <-x: a; case <-x: b}`},
{`select {case x := <-y: f(x)}`, 1, `select {case x := <-y: f(x)}`},
{`select {default: f()}`, 1, `select {default: f()}`},
{`select {default: f()}`, 0, `select {default: g()}`},
{`select {default: f()}`, 0, `select {}`},
{`select {default: f()}`, 0, `select {case <-x: f()}`},
// For stmt.
{`for {}`, 1, `for {}`},
{`for {}`, 0, `for cond {}`},
{`for {}`, 0, `for ; ; post {}`},
{`for {}`, 0, `for { f() }`},
{`for ; ; post {}`, 1, `for ; ; post {}`},
{`for ; ; post {}`, 0, `for ; ; _ {}`},
{`for ; ; post {}`, 0, `for {}`},
{`for ; ; post {}`, 0, `for init; ; {}`},
{`for ; ; post {}`, 0, `for ; cond; post {}`},
{`for ; ; post {}`, 0, `for init; cond; {}`},
{`for ; cond; {}`, 1, `for ; cond; {}`},
{`for ; cond; {}`, 0, `for ; _; {}`},
{`for ; cond; {}`, 0, `for {}`},
{`for ; cond; {}`, 0, `for init; cond; {}`},
{`for ; cond; {}`, 0, `for ; cond; post {}`},
{`for ; cond; post {}`, 1, `for ; cond; post {}`},
{`for ; cond; post {}`, 0, `for ; _; post {}`},
{`for ; cond; post {}`, 0, `for ; cond; _ {}`},
{`for ; cond; post {}`, 0, `for {}`},
{`for ; cond; post {}`, 0, `for ; ; post {}`},
{`for ; cond; post {}`, 0, `for ; _; post {}`},
{`for ; cond; post {}`, 0, `for init; cond; post {}`},
{`for init; ; {}`, 1, `for init; ; {}`},
{`for init; ; {}`, 0, `for _; ; {}`},
{`for init; ; {}`, 0, `for {}`},
{`for init; ; {}`, 0, `for init; cond; {}`},
{`for init; ; {}`, 0, `for init; ; post {}`},
{`for init; ; post {}`, 1, `for init; ; post {}`},
{`for init; ; post {}`, 0, `for {}`},
{`for init; ; post {}`, 0, `for init; ; _ {}`},
{`for init; ; post {}`, 0, `for _; ; post {}`},
{`for init; ; post {}`, 0, `for init; cond; post {}`},
{`for init; cond; {}`, 1, `for init; cond; {}`},
{`for init; cond; {}`, 0, `for init; cond; post {}`},
{`for init; cond; post {}`, 1, `for init; cond; post {}`},
{`for init; cond; post {}`, 0, `for init; ; post {}`},
{`for init; cond; post {}`, 0, `for _; cond; post {}`},
{`for { $*_; var $_ = regexp.MustCompile($s); $*_ }`, 1, `for { var re = regexp.MustCompile("\\d+") }`},
{`for { $*_; var $_ = regexp.MustCompile($s); $*_ }`, 1, `for { f(); var re = regexp.MustCompile("\\d+") }`},
{`for { $*_; var $_ = regexp.MustCompile($s); $*_ }`, 1, `for { var re = regexp.MustCompile("\\d+"); f() }`},
{`for { $*_; var $_ = regexp.MustCompile($s); $*_ }`, 1, `for { var (re = regexp.MustCompile("\\d+")) }`},
{`for { $*_; var $_ = regexp.MustCompile($s); $*_ }`, 1, `for { f(); var isNumberRE = regexp.MustCompile("\\d+"); f() }`},
{`for { $*_; var $_ = regexp.MustCompile($s); $*_ }`, 1, `for { f(); var isNumberRE = regexp.MustCompile("\\d+"); f(); g() }`},
{`for { $*_; var $_ = regexp.MustCompile($s); $*_ }`, 1, `for { f(); g(); var isNumberRE = regexp.MustCompile("\\d+"); f() }`},
{`for { $*_; var $_ = regexp.MustCompile($s); $*_ }`, 0, `for { var re, err = regexp.Compile("\\d+") }`},
{`for { $*_; var $_ = regexp.MustCompile($s); $*_ }`, 0, `for {}`},
{`for { $*_; var $_ = regexp.MustCompile($s); $*_ }`, 0, `for { regexp.MustCompile(pattern) }`},
{`for { $*_; var $_ = regexp.MustCompile($s); $*_ }`, 0, `for { re := regexp.MustCompile(pattern) }`},
{`for { $*_; var $_ = regexp.MustCompile($s); $*_ }`, 0, `for { re = regexp.MustCompile(pattern) }`},
// For stmt - optional matching.
{`for $*_; $*_; $*_ {}`, 1, `for {}`},
{`for $*_; $*_; $*_ {}`, 1, `for ; init; {}`},
{`for $*x; $*_; $*x {}`, 1, `for f(); cond; f() {}`},
{`for $*x; $*_; $*x {}`, 1, `for ; cond; {}`},
{`for $*x; $*_; $*x {}`, 0, `for f(); cond; g() {}`},
{`for $*x; $*_; $*x {}`, 0, `for f(); cond; {}`},
{`for $*x; $*_; $*x {}`, 0, `for ; cond; g() {}`},
// For stmt - unintentional matches (see https://github.com/golang/go/issues/44257).
{`for {}`, 1, `for ;; {}`},
{`for cond {}`, 1, `for ; cond; {}`},
{`for ;; {}`, 1, `for {}`},
{`for ; cond; {}`, 1, `for cond {}`},
// Range stmt.
{`for range xs {}`, 1, `for range xs {}`},
{`for range xs {}`, 0, `for range xs { f() }`},
{`for range xs {}`, 0, `for range ys {}`},
{`for range xs {}`, 0, `for i := range xs {}`},
{`for range xs {}`, 0, `for i, x := range xs {}`},
{`for i := range xs {}`, 1, `for i := range xs {}`},
{`for i := range xs {}`, 0, `for i = range xs {}`},
{`for i := range xs {}`, 0, `for i := range ys {}`},
{`for i := range xs {}`, 0, `for j := range xs {}`},
{`for i := range xs {}`, 0, `for range xs {}`},
{`for i, x := range xs {}`, 1, `for i, x := range xs {}`},
{`for i, x := range xs {}`, 0, `for i, x = range xs {}`},
{`for i, x := range xs {}`, 0, `for j, x := range xs {}`},
{`for i, x := range xs {}`, 0, `for i, y := range xs {}`},
{`for i, x := range xs {}`, 0, `for i, x := range ys {}`},
{`for i, x := range xs {}`, 0, `for range xs {}`},
{`for $x := range $y { $z }`, 1, `for i := range l { c() }`},
{`for $x := range $y { $z }`, 0, `for i = range l { c() }`},
{`for $x = range $y { $z }`, 0, `for i := range l { c() }`},
{`for range $y { $z }`, 0, `for _, e := range l { e() }`},
// Range stmt - optional matching.
{`for $*x; b; $*x {}`, 1, `for b {}`},
{`for $*x; b; $*x {}`, 1, `for a(); b; a() {}`},
{`for $*x; b; $*x {}`, 0, `for a(); b; c() {}`},
// TODO:
// {`for $*_ := range $_ {}`, 1, `for i := range xs {}`},
// {`for $*_ = range $_ {}`, 1, `for i = range xs {}`},
// {`for $*_ := range $_ {}`, 1, `for i, x := range xs {}`},
// {`for $*_ = range $_ {}`, 1, `for i, x = range xs {}`},
// {`for $*_ := range $_ {}`, 0, `for i, x = range xs {}`},
// {`for $*_ := range $_ {}`, 0, `for {}`},
// {`for $*_ := range $_ {}`, 0, `for cond {}`},
// TODO:
// {`for $*_ range $_ {}`, 1, `for range xs {}`},
// Any for loop.
// TODO: need to solve https://github.com/golang/go/issues/44257 first.
// {`for $*_ {}`, 1, `for {}`},
// {`for $*_ {}`, 1, `for i := 0; i < 10; i++ {}`},
// {`for $*_ {}`, 1, `for range xs {}`},
// {`for $*x {}; for $*x {}`, 1, `{ for {}; for {} }`},
// {`for $*x {}; for $*x {}`, 1, `{ for {}; for cond {} }`},
// {`for $*x {}; for $*x {}`, 1, `{ for x {}; for x {} }`},
// {`for $*x {}; for $*x {}`, 0, `{ for x {}; for y {} }`},
// {`for $*x {}; for $*x {}`, 1, `{ for range xs {}; for range xs {} }`},
// {`for $*x {}; for $*x {}`, 0, `{ for range xs {}; for range ys {} }`},
// {`for $*x {}; for $*x {}`, 1, `{ for a(); b(); {}; for a(); b(); {} }`},
// {`for $*x {}; for $*x {}`, 0, `{ for a(); b(); {}; for a(); b(); c() {} }`},
// Range clause.
{`range xs`, 1, `for i := range xs {}`},
{`range xs`, 1, `for i := range xs { f(i) }`},
{`range $x`, 1, `for i := range x { f(i) }`},
{`range $x`, 1, `for i := range y { f(i) }`},
{`range $x`, 2, `for _, xs := range a { for _, x := range xs { println(x) } }`},
{`range (xs)`, 1, `for i := range (xs) {}`},
{`range xs`, 0, `for i := range ys { f(i) }`},
{`range (xs)`, 0, `for i := range xs {}`},
// Range header.
{`for range $x`, 1, `for range xs {}`},
{`for range $x`, 0, `for i := range xs {}`},
{`for range $x`, 0, `for i = range xs {}`},
{`for $i := range $xs`, 1, `for i := range data {}`},
{`for $i := range $xs`, 0, `for i = range data {}`},
{`for $i := range $xs`, 0, `for i, x := range data {}`},
{`for $_, $i := range $xs`, 1, `for _, v := range data {}`},
{`for $_, $i := range $xs`, 1, `for i, v := range data {}`},
{`for $_, $i := range $xs`, 0, `for i = range data {}`},
{`for $_, $i := range $xs`, 0, `for range data {}`},
// Mixing expr and stmt lists.
{`$x, $y`, 0, `{ 1; 2 }`},
{`$x; $y`, 0, `f(1, 2)`},
// Stmt list (+ partial matches).
{`$*x; b; $*y`, 1, `{ a; b; c }`},
{`$*x; b; $*x`, 0, `{ a; b; c }`},
{`x; y`, 1, `{ x; y; z }`},
{`x; y`, 1, `{ z; x; y }`},
{`f(1); g(2)`, 1, `{ z; f(1); g(2); z }`},
{`x; y`, 0, `{ x; z; y }`},