予期しない障害アドレスにによってMINIMICタイプに私がしたいテンプレート

Question

のため作成された値を反映testDataを使用して反映しますが、反映してと間違って何unexpected fault address

func TestData(t *testing.T) { 
    tpl, err := template.New("ok").Parse("{{.Ok}}") 
    if err != nil { 
     panic(err) 
    } 
    buf := bytes.NewBuffer(nil) 
    myTyp := reflect.StructOf([]reflect.StructField{ 
     {Name: "MyFace", Type: reflect.TypeOf((*MyFace)(nil)).Elem(), Index: []int{0}, Anonymous: true}, 
    }) 
    myVal := reflect.New(myTyp).Elem() 
    myVal.Field(0).Set(reflect.ValueOf(MyFace(&testFace{}))) 
    err = tpl.Execute(buf, myVal.Interface()) // unexpected fault address 
    //err = tpl.Execute(buf, &testDat{MyFace: MyFace(&testFace{})}) // works as expected 
    if err != nil { 
     panic(err) 
    } 
    fmt.Println(buf.String()) 
} 

type testData struct { 
    MyFace 
} 
type testFace struct { 
} 

func (testFace) Ok() string { 
    return "All right" 
} 

type MyFace interface { 
    Ok() string 
} 

ERROR

unexpected fault address 0xc4200e83a0 
[signal SIGBUS: bus error code=0x2 addr=0xc4200e83a0 pc=0xc4200e83a0] 

goroutine 5 [running]: 
runtime.throw(0x13728ac, 0x5) 
    /usr/local/Cellar/go/1.9.1/libexec/src/runtime/panic.go:605 +0x95 fp=0xc420058fe8 sp=0xc420058fc8 pc=0x102d235 
runtime.sigpanic() 
    /usr/local/Cellar/go/1.9.1/libexec/src/runtime/signal_unix.go:364 +0x29d fp=0xc420059038 sp=0xc420058fe8 pc=0x1043c2d 
runtime.call32(0xc42007f260, 0xc42000e0a8, 0xc4200e8560, 0x800000018) 
    /usr/local/Cellar/go/1.9.1/libexec/src/runtime/asm_amd64.s:509 +0x3b fp=0xc420059068 sp=0xc420059038 pc=0x105a51b 
reflect.Value.call(0xc42009ca00, 0xc420048e10, 0x293, 0x1372569, 0x4, 0x155f1b8, 0x0, 0x0, 0x13711a0, 0x1, ...) 
    /usr/local/Cellar/go/1.9.1/libexec/src/reflect/value.go:434 +0x906 fp=0xc420059340 sp=0xc420059068 pc=0x10b1c76 
reflect.Value.Call(0xc42009ca00, 0xc420048e10, 0x293, 0x155f1b8, 0x0, 0x0, 0x150f5c0, 0xc420064300, 0xc420064300) 
    /usr/local/Cellar/go/1.9.1/libexec/src/reflect/value.go:302 +0xa4 fp=0xc4200593a8 sp=0xc420059340 pc=0x10b1254 
text/template.(*state).evalCall(0xc420059dd0, 0xc42009ca00, 0xc420048e10, 0x99, 0xc42009ca00, 0xc420048e10, 0x293, 0x150b800, 0xc42007eff0, 0x137307e, ...) 
    /usr/local/Cellar/go/1.9.1/libexec/src/text/template/exec.go:670 +0x580 fp=0xc4200595e0 sp=0xc4200593a8 pc=0x12b3480 
text/template.(*state).evalField(0xc420059dd0, 0xc42009ca00, 0xc420048e10, 0x99, 0x137307e, 0x2, 0x150b800, 0xc42007eff0, 0xc420048d00, 0x1, ...) 
    /usr/local/Cellar/go/1.9.1/libexec/src/text/template/exec.go:560 +0xd38 fp=0xc420059940 sp=0xc4200595e0 pc=0x12b2d98 
text/template.(*state).evalFieldChain(0xc420059dd0, 0xc42009ca00, 0xc420048e10, 0x99, 0xc42009ca00, 0xc420048e10, 0x99, 0x150b800, 0xc42007eff0, 0xc420048cf0, ...) 
    /usr/local/Cellar/go/1.9.1/libexec/src/text/template/exec.go:528 +0x22a fp=0xc4200599f8 sp=0xc420059940 pc=0x12b1d2a 
text/template.(*state).evalFieldNode(0xc420059dd0, 0xc42009ca00, 0xc420048e10, 0x99, 0xc42007eff0, 0xc420048d00, 0x1, 0x1, 0x0, 0x0, ...) 
    /usr/local/Cellar/go/1.9.1/libexec/src/text/template/exec.go:492 +0x118 fp=0xc420059ab0 sp=0xc4200599f8 pc=0x12b1478 
text/template.(*state).evalCommand(0xc420059dd0, 0xc42009ca00, 0xc420048e10, 0x99, 0xc42007efc0, 0x0, 0x0, 0x0, 0x348a0, 0x12fa0e0, ...) 
    /usr/local/Cellar/go/1.9.1/libexec/src/text/template/exec.go:430 +0x676 fp=0xc420059b60 sp=0xc420059ab0 pc=0x12b0e26 
text/template.(*state).evalPipeline(0xc420059dd0, 0xc42009ca00, 0xc420048e10, 0x99, 0xc420088280, 0xc42007f1d0, 0x30, 0x28) 
    /usr/local/Cellar/go/1.9.1/libexec/src/text/template/exec.go:408 +0x115 fp=0xc420059c58 sp=0xc420059b60 pc=0x12b0315 
text/template.(*state).walk(0xc420059dd0, 0xc42009ca00, 0xc420048e10, 0x99, 0x150b620, 0xc42007f020) 
    /usr/local/Cellar/go/1.9.1/libexec/src/text/template/exec.go:234 +0x4af fp=0xc420059cd8 sp=0xc420059c58 pc=0x12af01f 
text/template.(*state).walk(0xc420059dd0, 0xc42009ca00, 0xc420048e10, 0x99, 0x150b920, 0xc42007ef90) 
    /usr/local/Cellar/go/1.9.1/libexec/src/text/template/exec.go:242 +0x11d fp=0xc420059d58 sp=0xc420059cd8 pc=0x12aec8d 
text/template.(*Template).execute(0xc4200107c0, 0x1505a00, 0xc4200fe620, 0xc42009ca00, 0xc420048e10, 0x0, 0x0) 
    /usr/local/Cellar/go/1.9.1/libexec/src/text/template/exec.go:197 +0x1f9 fp=0xc420059e28 sp=0xc420059d58 pc=0x12ae6c9 
text/template.(*Template).Execute(0xc4200107c0, 0x1505a00, 0xc4200fe620, 0xc42009ca00, 0xc420048e10, 0x16, 0x194) 
    /usr/local/Cellar/go/1.9.1/libexec/src/text/template/exec.go:180 +0x53 fp=0xc420059e70 sp=0xc420059e28 pc=0x12ae4a3 
wenerme/tests/wcwork.TestData(0xc4201020f0) 
    /Users/wener/go/src/wenerme/tests/wcwork/types_test.go:241 +0x31f fp=0xc420059fa8 sp=0xc420059e70 pc=0x12c459f 
testing.tRunner(0xc4201020f0, 0x1387c28) 
    /usr/local/Cellar/go/1.9.1/libexec/src/testing/testing.go:746 +0xd0 fp=0xc420059fd0 sp=0xc420059fa8 pc=0x10efc60 
runtime.goexit() 
    /usr/local/Cellar/go/1.9.1/libexec/src/runtime/asm_amd64.s:2337 +0x1 fp=0xc420059fd8 sp=0xc420059fd0 pc=0x105cd41 
created by testing.(*T).Run 
    /usr/local/Cellar/go/1.9.1/libexec/src/testing/testing.go:789 +0x2de 

goroutine 1 [chan receive]: 
testing.(*T).Run(0xc420102000, 0x13732b1, 0x8, 0x1387c28, 0x107ab01) 
    /usr/local/Cellar/go/1.9.1/libexec/src/testing/testing.go:790 +0x2fc 
testing.runTests.func1(0xc420102000) 
    /usr/local/Cellar/go/1.9.1/libexec/src/testing/testing.go:1004 +0x64 
testing.tRunner(0xc420102000, 0xc420057de0) 
    /usr/local/Cellar/go/1.9.1/libexec/src/testing/testing.go:746 +0xd0 
testing.runTests(0xc4200e8320, 0x153b700, 0x5, 0x5, 0xc42009c820) 
    /usr/local/Cellar/go/1.9.1/libexec/src/testing/testing.go:1002 +0x2d8 
testing.(*M).Run(0xc420057f18, 0xc420057f70) 
    /usr/local/Cellar/go/1.9.1/libexec/src/testing/testing.go:921 +0x111 
main.main() 

を得ましたか。

Answer 1

を直接text/templateとhtml/template実行メソッドに渡すことができます。コードを変更して直接渡して、{.MyFace.Ok}を使用するとすべて正常に動作します。

package hello 

import (
    "bytes" 
    "fmt" 
    "html/template" 
    "reflect" 
    "testing" 
) 

func TestData(t *testing.T) { 
    tpl, err := template.New("ok").Parse("{{.MyFace.Ok}}") 
    if err != nil { 
     panic(err) 
    } 
    buf := bytes.NewBuffer(nil) 
    myTyp := reflect.StructOf([]reflect.StructField{ 
     {Name: "MyFace", Type: reflect.TypeOf((*MyFace)(nil)).Elem(), Index: []int{0}, Anonymous: true}, 
    }) 
    fmt.Println(myTyp) 
    myVal := reflect.New(myTyp) 
    myVal.Elem().Field(0).Set(reflect.New(reflect.TypeOf(testFace{})).Elem()) 
    err = tpl.Execute(buf, myVal.Elem()) // unexpected fault address 
    //err = tpl.Execute(buf, &testDat{MyFace: MyFace(&testFace{})}) // works as expected 
    if err != nil { 
     panic(err) 
    } 
    fmt.Println(buf.String()) 
} 

type testData struct { 
    MyFace 
} 
type testFace struct { 
    i int 
} 

func (testFace) Ok() string { 
    return "All right" 
} 

type MyFace interface { 
    Ok() string 
} 

しかし、外出先であなたの合格インターフェイス上の[OK]をする方法を見つけることができないので、あなたは上記のコードで使用myVal.Elem().Interface()であなたの問題のすべてをテストすることができますように：私は私のコードを添付します。

reflect.StructOfのドキュメントを参照してください。StructOfは現在、埋め込みフィールドのラッパーメソッドを生成しません。この制限は、将来のバージョンで解除される可能性があります。