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How to use String method of main Package

Best Syzkaller code snippet using main.String

rename_test.go

Source:rename_test.go

...30	}{31		// init() checks32		{33			ctxt: fakeContext(map[string][]string{34				"fmt": {`package fmt; type Stringer interface { String() }`},35				"main": {`36package main37import foo "fmt"38var v foo.Stringer39func f() { v.String(); f() }40`,41					`package main; var w int`},42			}),43			from: "main.v", to: "init",44			want: `you cannot have a var at package level named "init"`,45		},46		{47			from: "main.f", to: "init",48			want: `renaming this func "f" to "init" would make it a package initializer.*` +49				`but references to it exist`,50		},51		{52			from: "/go/src/main/0.go::foo", to: "init",53			want: `"init" is not a valid imported package name`,54		},55		// Export checks56		{57			from: "fmt.Stringer", to: "stringer",58			want: `renaming this type "Stringer" to "stringer" would make it unexported.*` +59				`breaking references from packages such as "main"`,60		},61		{62			from: "(fmt.Stringer).String", to: "string",63			want: `renaming this method "String" to "string" would make it unexported.*` +64				`breaking references from packages such as "main"`,65		},66		// Lexical scope checks67		{68			// file/package conflict, same file69			from: "main.v", to: "foo",70			want: `renaming this var "v" to "foo" would conflict.*` +71				`with this imported package name`,72		},73		{74			// file/package conflict, same file75			from: "main::foo", to: "v",76			want: `renaming this imported package name "foo" to "v" would conflict.*` +77				`with this package member var`,78		},79		{80			// file/package conflict, different files81			from: "main.w", to: "foo",82			want: `renaming this var "w" to "foo" would conflict.*` +83				`with this imported package name`,84		},85		{86			// file/package conflict, different files87			from: "main::foo", to: "w",88			want: `renaming this imported package name "foo" to "w" would conflict.*` +89				`with this package member var`,90		},91		{92			ctxt: main(`93package main94var x, z int95func f(y int) {96	print(x)97	print(y)98}99func g(w int) {100	print(x)101	x := 1102	print(x)103}`),104			from: "main.x", to: "y",105			want: `renaming this var "x" to "y".*` +106				`would cause this reference to become shadowed.*` +107				`by this intervening var definition`,108		},109		{110			from: "main.g::x", to: "w",111			want: `renaming this var "x" to "w".*` +112				`conflicts with var in same block`,113		},114		{115			from: "main.f::y", to: "x",116			want: `renaming this var "y" to "x".*` +117				`would shadow this reference.*` +118				`to the var declared here`,119		},120		{121			from: "main.g::w", to: "x",122			want: `renaming this var "w" to "x".*` +123				`conflicts with var in same block`,124		},125		{126			from: "main.z", to: "y", want: "OK",127		},128		// Label checks129		{130			ctxt: main(`131package main132func f() {133foo:134	goto foo135bar:136	goto bar137	func(x int) {138	wiz:139		goto wiz140	}(0)141}142`),143			from: "main.f::foo", to: "bar",144			want: `renaming this label "foo" to "bar".*` +145				`would conflict with this one`,146		},147		{148			from: "main.f::foo", to: "wiz", want: "OK",149		},150		{151			from: "main.f::wiz", to: "x", want: "OK",152		},153		{154			from: "main.f::x", to: "wiz", want: "OK",155		},156		{157			from: "main.f::wiz", to: "foo", want: "OK",158		},159		// Struct fields160		{161			ctxt: main(`162package main163type U struct { u int }164type V struct { v int }165func (V) x() {}166type W (struct {167	U168	V169	w int170})171func f() {172	var w W173	print(w.u) // NB: there is no selection of w.v174	var _ struct { yy, zz int }175}176`),177			// field/field conflict in named struct declaration178			from: "(main.W).U", to: "w",179			want: `renaming this field "U" to "w".*` +180				`would conflict with this field`,181		},182		{183			// rename type used as embedded field184			// => rename field185			// => field/field conflict186			// This is an entailed renaming;187			// it would be nice if we checked source positions.188			from: "main.U", to: "w",189			want: `renaming this field "U" to "w".*` +190				`would conflict with this field`,191		},192		{193			// field/field conflict in unnamed struct declaration194			from: "main.f::zz", to: "yy",195			want: `renaming this field "zz" to "yy".*` +196				`would conflict with this field`,197		},198		// Now we test both directions of (u,v) (u,w) (v,w) (u,x) (v,x).199		// Too bad we don't test position info...200		{201			// field/field ambiguity at same promotion level ('from' selection)202			from: "(main.U).u", to: "v",203			want: `renaming this field "u" to "v".*` +204				`would make this reference ambiguous.*` +205				`with this field`,206		},207		{208			// field/field ambiguity at same promotion level ('to' selection)209			from: "(main.V).v", to: "u",210			want: `renaming this field "v" to "u".*` +211				`would make this reference ambiguous.*` +212				`with this field`,213		},214		{215			// field/method conflict at different promotion level ('from' selection)216			from: "(main.U).u", to: "w",217			want: `renaming this field "u" to "w".*` +218				`would change the referent of this selection.*` +219				`of this field`,220		},221		{222			// field/field shadowing at different promotion levels ('to' selection)223			from: "(main.W).w", to: "u",224			want: `renaming this field "w" to "u".*` +225				`would shadow this selection.*` +226				`of the field declared here`,227		},228		{229			from: "(main.V).v", to: "w",230			want: "OK", // since no selections are made ambiguous231		},232		{233			from: "(main.W).w", to: "v",234			want: "OK", // since no selections are made ambiguous235		},236		{237			// field/method ambiguity at same promotion level ('from' selection)238			from: "(main.U).u", to: "x",239			want: `renaming this field "u" to "x".*` +240				`would make this reference ambiguous.*` +241				`with this method`,242		},243		{244			// field/field ambiguity at same promotion level ('to' selection)245			from: "(main.V).x", to: "u",246			want: `renaming this method "x" to "u".*` +247				`would make this reference ambiguous.*` +248				`with this field`,249		},250		{251			// field/method conflict at named struct declaration252			from: "(main.V).v", to: "x",253			want: `renaming this field "v" to "x".*` +254				`would conflict with this method`,255		},256		{257			// field/method conflict at named struct declaration258			from: "(main.V).x", to: "v",259			want: `renaming this method "x" to "v".*` +260				`would conflict with this field`,261		},262		// Methods263		{264			ctxt: main(`265package main266type C int267func (C) f()268func (C) g()269type D int270func (*D) f()271func (*D) g()272type I interface { f(); g() }273type J interface { I; h() }274var _ I = new(D)275var _ interface {f()} = C(0)276`),277			from: "(main.I).f", to: "g",278			want: `renaming this interface method "f" to "g".*` +279				`would conflict with this method`,280		},281		{282			from: `("main".I).f`, to: "h", // NB: exercises quoted import paths too283			want: `renaming this interface method "f" to "h".*` +284				`would conflict with this method.*` +285				`in named interface type "J"`,286		},287		{288			// type J interface { h; h() } is not a conflict, amusingly.289			from: "main.I", to: "h",290			want: `OK`,291		},292		{293			from: "(main.J).h", to: "f",294			want: `renaming this interface method "h" to "f".*` +295				`would conflict with this method`,296		},297		{298			from: "(main.C).f", to: "e",299			want: `renaming this method "f" to "e".*` +300				`would make main.C no longer assignable to interface{f..}.*` +301				`(rename interface{f..}.f if you intend to change both types)`,302		},303		{304			from: "(main.D).g", to: "e",305			want: `renaming this method "g" to "e".*` +306				`would make \*main.D no longer assignable to interface I.*` +307				`(rename main.I.g if you intend to change both types)`,308		},309		{310			from: "(main.I).f", to: "e",311			want: `OK`,312		},313		// Indirect C/I method coupling via another concrete type D.314		{315			ctxt: main(`316package main317type I interface { f() }318type C int319func (C) f()320type D struct{C}321var _ I = D{}322`),323			from: "(main.C).f", to: "F",324			want: `renaming this method "f" to "F".*` +325				`would make main.D no longer assignable to interface I.*` +326				`(rename main.I.f if you intend to change both types)`,327		},328		// Renaming causes promoted method to become shadowed; C no longer satisfies I.329		{330			ctxt: main(`331package main332type I interface { f() }333type C struct { I }334func (C) g() int335var _ I = C{}336`),337			from: "main.I.f", to: "g",338			want: `renaming this method "f" to "g".*` +339				`would change the g method of main.C invoked via interface main.I.*` +340				`from \(main.I\).g.*` +341				`to \(main.C\).g`,342		},343		// Renaming causes promoted method to become ambiguous; C no longer satisfies I.344		{345			ctxt: main(`346package main347type I interface{f()}348type C int349func (C) f()350type D int351func (D) g()352type E struct{C;D}353var _ I = E{}354`),355			from: "main.I.f", to: "g",356			want: `renaming this method "f" to "g".*` +357				`would make the g method of main.E invoked via interface main.I ambiguous.*` +358				`with \(main.D\).g`,359		},360	} {361		var conflicts []string362		reportError = func(posn token.Position, message string) {363			conflicts = append(conflicts, message)364		}365		if test.ctxt != nil {366			ctxt = test.ctxt367		}368		err := Main(ctxt, test.offset, test.from, test.to)369		var prefix string370		if test.offset == "" {371			prefix = fmt.Sprintf("-from %q -to %q", test.from, test.to)372		} else {373			prefix = fmt.Sprintf("-offset %q -to %q", test.offset, test.to)374		}375		if err == ConflictError {376			got := strings.Join(conflicts, "\n")377			if false {378				t.Logf("%s: %s", prefix, got)379			}380			pattern := "(?s:" + test.want + ")" // enable multi-line matching381			if !regexp.MustCompile(pattern).MatchString(got) {382				t.Errorf("%s: conflict does not match pattern:\n"+383					"Conflict:\t%s\n"+384					"Pattern: %s",385					prefix, got, test.want)386			}387		} else if err != nil {388			t.Errorf("%s: unexpected error: %s", prefix, err)389		} else if test.want != "OK" {390			t.Errorf("%s: unexpected success, want conflicts matching:\n%s",391				prefix, test.want)392		}393	}394}395func TestInvalidIdentifiers(t *testing.T) {396	ctxt := fakeContext(map[string][]string{397		"main": {`398package main399func f() { }400`}})401	for _, test := range []struct {402		from, to string // values of the -offset/-from and -to flags403		want     string // expected error message404	}{405		{406			from: "main.f", to: "_",407			want: `-to "_": not a valid identifier`,408		},409		{410			from: "main.f", to: "123",411			want: `-to "123": not a valid identifier`,412		},413		{414			from: "main.f", to: "for",415			want: `-to "for": not a valid identifier`,416		},417		{418			from: "switch", to: "v",419			want: `-from "switch": invalid expression`,420		},421	} {422		err := Main(ctxt, "", test.from, test.to)423		prefix := fmt.Sprintf("-from %q -to %q", test.from, test.to)424		if err == nil {425			t.Errorf("%s: expected error %q", prefix, test.want)426		} else if err.Error() != test.want {427			t.Errorf("%s: unexpected error\nwant: %s\n got: %s", prefix, test.want, err.Error())428		}429	}430}431func TestRewrites(t *testing.T) {432	defer func(savedWriteFile func(string, []byte) error) {433		writeFile = savedWriteFile434	}(writeFile)435	var ctxt *build.Context436	for _, test := range []struct {437		ctxt             *build.Context    // nil => use previous438		offset, from, to string            // values of the -from/-offset and -to flags439		want             map[string]string // contents of updated files440	}{441		// Elimination of renaming import.442		{443			ctxt: fakeContext(map[string][]string{444				"foo": {`package foo; type T int`},445				"main": {`package main446import foo2 "foo"447var _ foo2.T448`},449			}),450			from: "main::foo2", to: "foo",451			want: map[string]string{452				"/go/src/main/0.go": `package main453import "foo"454var _ foo.T455`,456			},457		},458		// Introduction of renaming import.459		{460			ctxt: fakeContext(map[string][]string{461				"foo": {`package foo; type T int`},462				"main": {`package main463import "foo"464var _ foo.T465`},466			}),467			offset: "/go/src/main/0.go:#36", to: "foo2", // the "foo" in foo.T468			want: map[string]string{469				"/go/src/main/0.go": `package main470import foo2 "foo"471var _ foo2.T472`,473			},474		},475		// Renaming of package-level member.476		{477			from: "foo.T", to: "U",478			want: map[string]string{479				"/go/src/main/0.go": `package main480import "foo"481var _ foo.U482`,483				"/go/src/foo/0.go": `package foo484type U int485`,486			},487		},488		// Rename package-level func plus doc489		{490			ctxt: main(`package main491// Foo is a no-op.492// Calling Foo does nothing.493func Foo() {494}495`),496			from: "main.Foo", to: "FooBar",497			want: map[string]string{498				"/go/src/main/0.go": `package main499// FooBar is a no-op.500// Calling FooBar does nothing.501func FooBar() {502}503`,504			},505		},506		// Rename method plus doc507		{508			ctxt: main(`package main509type Foo struct{}510// Bar does nothing.511func (Foo) Bar() {512}513`),514			from: "main.Foo.Bar", to: "Baz",515			want: map[string]string{516				"/go/src/main/0.go": `package main517type Foo struct{}518// Baz does nothing.519func (Foo) Baz() {520}521`,522			},523		},524		// Rename type spec plus doc525		{526			ctxt: main(`package main527type (528	// Test but not Testing.529	Test struct{}530)531`),532			from: "main.Test", to: "Type",533			want: map[string]string{534				"/go/src/main/0.go": `package main535type (536	// Type but not Testing.537	Type struct{}538)539`,540			},541		},542		// Rename type in gen decl plus doc543		{544			ctxt: main(`package main545// T is a test type.546type T struct{}547`),548			from: "main.T", to: "Type",549			want: map[string]string{550				"/go/src/main/0.go": `package main551// Type is a test type.552type Type struct{}553`,554			},555		},556		// Rename value spec with doc557		{558			ctxt: main(`package main559const (560	// C is the speed of light.561	C = 2.998e8562)563`),564			from: "main.C", to: "Lightspeed",565			want: map[string]string{566				"/go/src/main/0.go": `package main567const (568	// Lightspeed is the speed of light.569	Lightspeed = 2.998e8570)571`,572			},573		},574		// Rename value inside gen decl with doc575		{576			ctxt: main(`package main577var out *string578`),579			from: "main.out", to: "discard",580			want: map[string]string{581				"/go/src/main/0.go": `package main582var discard *string583`,584			},585		},586		// Rename field plus doc587		{588			ctxt: main(`package main589type Struct struct {590	// Field is a struct field.591	Field string592}593`),594			from: "main.Struct.Field", to: "Foo",595			want: map[string]string{596				"/go/src/main/0.go": `package main597type Struct struct {598	// Foo is a struct field.599	Foo string600}601`,602			},603		},604		// Label renamings.605		{606			ctxt: main(`package main607func f() {608loop:609	loop := 0610	go func() {611	loop:612		goto loop613	}()614	loop++615	goto loop616}617`),618			offset: "/go/src/main/0.go:#25", to: "loop2", // def of outer label "loop"619			want: map[string]string{620				"/go/src/main/0.go": `package main621func f() {622loop2:623	loop := 0624	go func() {625	loop:626		goto loop627	}()628	loop++629	goto loop2630}631`,632			},633		},634		{635			offset: "/go/src/main/0.go:#70", to: "loop2", // ref to inner label "loop"636			want: map[string]string{637				"/go/src/main/0.go": `package main638func f() {639loop:640	loop := 0641	go func() {642	loop2:643		goto loop2644	}()645	loop++646	goto loop647}648`,649			},650		},651		// Renaming of type used as embedded field.652		{653			ctxt: main(`package main654type T int655type U struct { T }656var _ = U{}.T657`),658			from: "main.T", to: "T2",659			want: map[string]string{660				"/go/src/main/0.go": `package main661type T2 int662type U struct{ T2 }663var _ = U{}.T2664`,665			},666		},667		// Renaming of embedded field.668		{669			ctxt: main(`package main670type T int671type U struct { T }672var _ = U{}.T673`),674			offset: "/go/src/main/0.go:#58", to: "T2", // T in "U{}.T"675			want: map[string]string{676				"/go/src/main/0.go": `package main677type T2 int678type U struct{ T2 }679var _ = U{}.T2680`,681			},682		},683		// Renaming of pointer embedded field.684		{685			ctxt: main(`package main686type T int687type U struct { *T }688var _ = U{}.T689`),690			offset: "/go/src/main/0.go:#59", to: "T2", // T in "U{}.T"691			want: map[string]string{692				"/go/src/main/0.go": `package main693type T2 int694type U struct{ *T2 }695var _ = U{}.T2696`,697			},698		},699		// Lexical scope tests.700		{701			ctxt: main(`package main702var y int703func f() {704	print(y)705	y := ""706	print(y)707}708`),709			from: "main.y", to: "x",710			want: map[string]string{711				"/go/src/main/0.go": `package main712var x int713func f() {714	print(x)715	y := ""716	print(y)717}718`,719			},720		},721		{722			from: "main.f::y", to: "x",723			want: map[string]string{724				"/go/src/main/0.go": `package main725var y int726func f() {727	print(y)728	x := ""729	print(x)730}731`,732			},733		},734		// Renaming of typeswitch vars (a corner case).735		{736			ctxt: main(`package main737func f(z interface{}) {738	switch y := z.(type) {739	case int:740		print(y)741	default:742		print(y)743	}744}745`),746			offset: "/go/src/main/0.go:#46", to: "x", // def of y747			want: map[string]string{748				"/go/src/main/0.go": `package main749func f(z interface{}) {750	switch x := z.(type) {751	case int:752		print(x)753	default:754		print(x)755	}756}757`},758		},759		{760			offset: "/go/src/main/0.go:#81", to: "x", // ref of y in case int761			want: map[string]string{762				"/go/src/main/0.go": `package main763func f(z interface{}) {764	switch x := z.(type) {765	case int:766		print(x)767	default:768		print(x)769	}770}771`},772		},773		{774			offset: "/go/src/main/0.go:#102", to: "x", // ref of y in default case775			want: map[string]string{776				"/go/src/main/0.go": `package main777func f(z interface{}) {778	switch x := z.(type) {779	case int:780		print(x)781	default:782		print(x)783	}784}785`},786		},787		// Renaming of embedded field that is a qualified reference.788		// (Regression test for bug 8924.)789		{790			ctxt: fakeContext(map[string][]string{791				"foo": {`package foo; type T int`},792				"main": {`package main793import "foo"794type _ struct{ *foo.T }795`},796			}),797			offset: "/go/src/main/0.go:#48", to: "U", // the "T" in *foo.T798			want: map[string]string{799				"/go/src/foo/0.go": `package foo800type U int801`,802				"/go/src/main/0.go": `package main803import "foo"804type _ struct{ *foo.U }805`,806			},807		},808		// Renaming of embedded field that is a qualified reference with the '-from' flag.809		// (Regression test for bug 12038.)810		{811			ctxt: fakeContext(map[string][]string{812				"foo": {`package foo; type T int`},813				"main": {`package main814import "foo"815type V struct{ *foo.T }816`},817			}),818			from: "(main.V).T", to: "U", // the "T" in *foo.T819			want: map[string]string{820				"/go/src/foo/0.go": `package foo821type U int822`,823				"/go/src/main/0.go": `package main824import "foo"825type V struct{ *foo.U }826`,827			},828		},829		{830			ctxt: fakeContext(map[string][]string{831				"foo": {`package foo; type T int`},832				"main": {`package main833import "foo"834type V struct{ foo.T }835`},836			}),837			from: "(main.V).T", to: "U", // the "T" in *foo.T838			want: map[string]string{839				"/go/src/foo/0.go": `package foo840type U int841`,842				"/go/src/main/0.go": `package main843import "foo"844type V struct{ foo.U }845`,846			},847		},848		// Interface method renaming.849		{850			ctxt: fakeContext(map[string][]string{851				"main": {`852package main853type I interface {854	f()855}856type J interface { f(); g() }857type A int858func (A) f()859type B int860func (B) f()861func (B) g()862type C int863func (C) f()864func (C) g()865var _, _ I = A(0), B(0)866var _, _ J = B(0), C(0)867`,868				},869			}),870			offset: "/go/src/main/0.go:#34", to: "F", // abstract method I.f871			want: map[string]string{872				"/go/src/main/0.go": `package main873type I interface {874	F()875}876type J interface {877	F()878	g()879}880type A int881func (A) F()882type B int883func (B) F()884func (B) g()885type C int886func (C) F()887func (C) g()888var _, _ I = A(0), B(0)889var _, _ J = B(0), C(0)890`,891			},892		},893		{894			offset: "/go/src/main/0.go:#59", to: "F", // abstract method J.f895			want: map[string]string{896				"/go/src/main/0.go": `package main897type I interface {898	F()899}900type J interface {901	F()902	g()903}904type A int905func (A) F()906type B int907func (B) F()908func (B) g()909type C int910func (C) F()911func (C) g()912var _, _ I = A(0), B(0)913var _, _ J = B(0), C(0)914`,915			},916		},917		{918			offset: "/go/src/main/0.go:#64", to: "G", // abstract method J.g919			want: map[string]string{920				"/go/src/main/0.go": `package main921type I interface {922	f()923}924type J interface {925	f()926	G()927}928type A int929func (A) f()930type B int931func (B) f()932func (B) G()933type C int934func (C) f()935func (C) G()936var _, _ I = A(0), B(0)937var _, _ J = B(0), C(0)938`,939			},940		},941		// Indirect coupling of I.f to C.f from D->I assignment and anonymous field of D.942		{943			ctxt: fakeContext(map[string][]string{944				"main": {`945package main946type I interface {947	f()948}949type C int950func (C) f()951type D struct{C}952var _ I = D{}953`,954				},955			}),956			offset: "/go/src/main/0.go:#34", to: "F", // abstract method I.f957			want: map[string]string{958				"/go/src/main/0.go": `package main959type I interface {960	F()961}962type C int963func (C) F()964type D struct{ C }965var _ I = D{}966`,967			},968		},969		// Interface embedded in struct.  No conflict if C need not satisfy I.970		{971			ctxt: fakeContext(map[string][]string{972				"main": {`973package main974type I interface {975	f()976}977type C struct{I}978func (C) g() int979var _ int = C{}.g()980`,981				},982			}),983			offset: "/go/src/main/0.go:#34", to: "g", // abstract method I.f984			want: map[string]string{985				"/go/src/main/0.go": `package main986type I interface {987	g()988}989type C struct{ I }990func (C) g() int991var _ int = C{}.g()992`,993			},994		},995		// A type assertion causes method coupling iff signatures match.996		{997			ctxt: fakeContext(map[string][]string{998				"main": {`package main999type I interface{1000	f()1001}1002type J interface{1003	f()1004}1005var _ = I(nil).(J)1006`,1007				},1008			}),1009			offset: "/go/src/main/0.go:#32", to: "g", // abstract method I.f1010			want: map[string]string{1011				"/go/src/main/0.go": `package main1012type I interface {1013	g()1014}1015type J interface {1016	g()1017}1018var _ = I(nil).(J)1019`,1020			},1021		},1022		// Impossible type assertion: no method coupling.1023		{1024			ctxt: fakeContext(map[string][]string{1025				"main": {`package main1026type I interface{1027	f()1028}1029type J interface{1030	f()int1031}1032var _ = I(nil).(J)1033`,1034				},1035			}),1036			offset: "/go/src/main/0.go:#32", to: "g", // abstract method I.f1037			want: map[string]string{1038				"/go/src/main/0.go": `package main1039type I interface {1040	g()1041}1042type J interface {1043	f() int1044}1045var _ = I(nil).(J)1046`,1047			},1048		},1049		// Impossible type assertion: no method coupling C.f<->J.f.1050		{1051			ctxt: fakeContext(map[string][]string{1052				"main": {`package main1053type I interface{1054	f()1055}1056type C int1057func (C) f()1058type J interface{1059	f()int1060}1061var _ = I(C(0)).(J)1062`,1063				},1064			}),1065			offset: "/go/src/main/0.go:#32", to: "g", // abstract method I.f1066			want: map[string]string{1067				"/go/src/main/0.go": `package main1068type I interface {1069	g()1070}1071type C int1072func (C) g()1073type J interface {1074	f() int1075}1076var _ = I(C(0)).(J)1077`,1078			},1079		},1080		// Progress after "soft" type errors (Go issue 14596).1081		{1082			ctxt: fakeContext(map[string][]string{1083				"main": {`package main1084func main() {1085	var unused, x int1086	print(x)1087}1088`,1089				},1090			}),1091			offset: "/go/src/main/0.go:#54", to: "y", // var x1092			want: map[string]string{1093				"/go/src/main/0.go": `package main1094func main() {1095	var unused, y int1096	print(y)1097}1098`,1099			},1100		},1101	} {1102		if test.ctxt != nil {1103			ctxt = test.ctxt1104		}1105		got := make(map[string]string)1106		writeFile = func(filename string, content []byte) error {1107			got[filepath.ToSlash(filename)] = string(content)1108			return nil1109		}1110		err := Main(ctxt, test.offset, test.from, test.to)1111		var prefix string1112		if test.offset == "" {1113			prefix = fmt.Sprintf("-from %q -to %q", test.from, test.to)1114		} else {1115			prefix = fmt.Sprintf("-offset %q -to %q", test.offset, test.to)1116		}1117		if err != nil {1118			t.Errorf("%s: unexpected error: %s", prefix, err)1119			continue1120		}1121		for file, wantContent := range test.want {1122			gotContent, ok := got[file]1123			delete(got, file)1124			if !ok {1125				t.Errorf("%s: file %s not rewritten", prefix, file)1126				continue1127			}1128			if gotContent != wantContent {1129				t.Errorf("%s: rewritten file %s does not match expectation; got <<<%s>>>\n"+1130					"want <<<%s>>>", prefix, file, gotContent, wantContent)1131			}1132		}1133		// got should now be empty1134		for file := range got {1135			t.Errorf("%s: unexpected rewrite of file %s", prefix, file)1136		}1137	}1138}1139func TestDiff(t *testing.T) {1140	if runtime.GOOS == "windows" {1141		t.Skipf("diff tool non-existent for windows on builders")1142	}1143	if runtime.GOOS == "plan9" {1144		t.Skipf("plan9 diff tool doesn't support -u flag")1145	}1146	defer func() {1147		Diff = false1148		stdout = os.Stdout1149	}()1150	Diff = true1151	stdout = new(bytes.Buffer)1152	if err := Main(&build.Default, "", `"golang.org/x/tools/refactor/rename".justHereForTestingDiff`, "Foo"); err != nil {1153		t.Fatal(err)1154	}1155	// NB: there are tabs in the string literal!1156	if !strings.Contains(stdout.(fmt.Stringer).String(), `1157-func justHereForTestingDiff() {1158-	justHereForTestingDiff()1159+func Foo() {1160+	Foo()1161 }1162`) {1163		t.Errorf("unexpected diff:\n<<%s>>", stdout)1164	}1165}1166func justHereForTestingDiff() {1167	justHereForTestingDiff()1168}1169// ---------------------------------------------------------------------1170// Simplifying wrapper around buildutil.FakeContext for packages whose...

String

Using AI Code Generation

1import (2func main() {3	fmt.Println(a, b)4}5import (6func main() {7	fmt.Println(a, b)8}9import (10func main() {11	fmt.Println(a, b)12}13import (14func main() {15	fmt.Println(a, b)16}17import (18func main() {19	fmt.Println(a, b)20}21import (22func main() {23	fmt.Println(a, b)24}25import (26func main() {27	fmt.Println(a, b)28}29import (30func main() {31	fmt.Println(a, b)32}33import (34func main() {35	fmt.Println(a, b)36}37import (38func main() {39	fmt.Println(a, b)40}41import (

String

Using AI Code Generation

1import "fmt"2func main() {3    var a = new(Student)4    fmt.Println(a)5}6&{Jack 21}7import "fmt"8type Student struct {9}10func (s *Student) String() string {11    return fmt.Sprintf("Name: %s, Age: %d", s.Name, s.Age)12}13func main() {14    var a = new(Student)15    fmt.Println(a)16}

String

Using AI Code Generation

1import "fmt"2func main() {3    var s1 = mainStruct{"abc", 123}4    fmt.Println(s1.String())5}6import "fmt"7func main() {8    var s1 = mainStruct{"abc", 123}9    fmt.Println(s1)10}11The String() method is called when the object is passed to Println()

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