1 files changed, 70 insertions, 1 deletions
diff --git a/libgo/go/reflect/example_test.go b/libgo/go/reflect/example_test.go
index 8ebf9765b8..f959b95846 100644
--- a/libgo/go/reflect/example_test.go
+++ b/libgo/go/reflect/example_test.go
@@ -1,10 +1,12 @@
-// Copyright 2012 The Go Authors.  All rights reserved.
+// 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.
 
 package reflect_test
 
 import (
+	"bytes"
+	"encoding/json"
 	"fmt"
 	"io"
 	"os"
@@ -67,6 +69,34 @@ func ExampleStructTag() {
 	// blue gopher
 }
 
+func ExampleStructTag_Lookup() {
+	type S struct {
+		F0 string `alias:"field_0"`
+		F1 string `alias:""`
+		F2 string
+	}
+
+	s := S{}
+	st := reflect.TypeOf(s)
+	for i := 0; i < st.NumField(); i++ {
+		field := st.Field(i)
+		if alias, ok := field.Tag.Lookup("alias"); ok {
+			if alias == "" {
+				fmt.Println("(blank)")
+			} else {
+				fmt.Println(alias)
+			}
+		} else {
+			fmt.Println("(not specified)")
+		}
+	}
+
+	// Output:
+	// field_0
+	// (blank)
+	// (not specified)
+}
+
 func ExampleTypeOf() {
 	// As interface types are only used for static typing, a
 	// common idiom to find the reflection Type for an interface
@@ -79,3 +109,42 @@ func ExampleTypeOf() {
 	// Output:
 	// true
 }
+
+func ExampleStructOf() {
+	typ := reflect.StructOf([]reflect.StructField{
+		{
+			Name: "Height",
+			Type: reflect.TypeOf(float64(0)),
+			Tag:  `json:"height"`,
+		},
+		{
+			Name: "Age",
+			Type: reflect.TypeOf(int(0)),
+			Tag:  `json:"age"`,
+		},
+	})
+
+	v := reflect.New(typ).Elem()
+	v.Field(0).SetFloat(0.4)
+	v.Field(1).SetInt(2)
+	s := v.Addr().Interface()
+
+	w := new(bytes.Buffer)
+	if err := json.NewEncoder(w).Encode(s); err != nil {
+		panic(err)
+	}
+
+	fmt.Printf("value: %+v\n", s)
+	fmt.Printf("json:  %s", w.Bytes())
+
+	r := bytes.NewReader([]byte(`{"height":1.5,"age":10}`))
+	if err := json.NewDecoder(r).Decode(s); err != nil {
+		panic(err)
+	}
+	fmt.Printf("value: %+v\n", s)
+
+	// Output:
+	// value: &{Height:0.4 Age:2}
+	// json:  {"height":0.4,"age":2}
+	// value: &{Height:1.5 Age:10}
+}