Untitled

package main

import (
    "net/http"
    "text/template"
)

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
        w.Header().Add("Content Type", "text/html")
        templates := template.New("template")
        templates.New("test").Parse(doc)
        templates.New("header").Parse(header)
        templates.New("footer").Parse(footer)
        context := Context{
            [3]string{"Lemon", "Orange", "Apple"},
            "the title",
        }
        templates.Lookup("test").Execute(w, context)

    })

    http.ListenAndServe(":80", nil)
}

const doc = `
{{template "header" . Title}}
    <body>
        <h1>List of Fruit</h1>
        <ul>
            {{range .Fruit}}
                <li>{{.}}</li>
            {{end}}
        </ul>
    </body>
`

const header = `
<!DOCTYPE html>
<html>
    <head><title>{{.}}</title></head>
`

const footer = `
</html>
`

type Context struct {
    Fruit [3]string
    Title string
}

2015/07/01 13:53:14 http: panic serving 127.0.0.1:56994: runtime error: invalid memory address or nil pointer dereference
goroutine 5 [running]:
net/http.func·011()
        c:/go/src/net/http/server.go:1130 +0xc2
text/template.errRecover(0xc082097b48)
        c:/go/src/text/template/exec.go:100 +0xc3
text/template.(*Template).Execute(0x0, 0x353378, 0xc082070280, 0x6a5000, 0xc082008840, 0x0, 0x0)
        c:/go/src/text/template/exec.go:137 +0x249
main.func·001(0x353210, 0xc082070280, 0xc082020000)
        D:/Go/src/main/main.go:19 +0x325
net/http.HandlerFunc.ServeHTTP(0x786560, 0x353210, 0xc082070280, 0xc082020000)
        c:/go/src/net/http/server.go:1265 +0x48
net/http.(*ServeMux).ServeHTTP(0xc08205c360, 0x353210, 0xc082070280, 0xc082020000)
        c:/go/src/net/http/server.go:1541 +0x184
net/http.serverHandler.ServeHTTP(0xc082044180, 0x353210, 0xc082070280, 0xc082020000)
        c:/go/src/net/http/server.go:1703 +0x1a1
net/http.(*conn).serve(0xc082070000)
        c:/go/src/net/http/server.go:1204 +0xb5e
created by net/http.(*Server).Serve
        c:/go/src/net/http/server.go:1751 +0x365
2015/07/01 13:53:14 http: panic serving 127.0.0.1:56995: runtime error: invalid memory address or nil pointer dereference
goroutine 6 [running]:
net/http.func·011()
        c:/go/src/net/http/server.go:1130 +0xc2
text/template.errRecover(0xc082067b48)
        c:/go/src/text/template/exec.go:100 +0xc3
text/template.(*Template).Execute(0x0, 0x353378, 0xc082070320, 0x6a5000, 0xc082008a40, 0x0, 0x0)
        c:/go/src/text/template/exec.go:137 +0x249
main.func·001(0x353210, 0xc082070320, 0xc0820200d0)
        D:/Go/src/main/main.go:19 +0x325
net/http.HandlerFunc.ServeHTTP(0x786560, 0x353210, 0xc082070320, 0xc0820200d0)
        c:/go/src/net/http/server.go:1265 +0x48
net/http.(*ServeMux).ServeHTTP(0xc08205c360, 0x353210, 0xc082070320, 0xc0820200d0)
        c:/go/src/net/http/server.go:1541 +0x184
net/http.serverHandler.ServeHTTP(0xc082044180, 0x353210, 0xc082070320, 0xc0820200d0)
        c:/go/src/net/http/server.go:1703 +0x1a1
net/http.(*conn).serve(0xc0820701e0)
        c:/go/src/net/http/server.go:1204 +0xb5e
created by net/http.(*Server).Serve
        c:/go/src/net/http/server.go:1751 +0x365
2015/07/01 13:53:14 http: panic serving 127.0.0.1:56997: runtime error: invalid memory address or nil pointer dereference
goroutine 13 [running]:
net/http.func·011()
        c:/go/src/net/http/server.go:1130 +0xc2
text/template.errRecover(0xc08201fb48)
        c:/go/src/text/template/exec.go:100 +0xc3
text/template.(*Template).Execute(0x0, 0x353378, 0xc082070460, 0x6a5000, 0xc082008dc0, 0x0, 0x0)
        c:/go/src/text/template/exec.go:137 +0x249
main.func·001(0x353210, 0xc082070460, 0xc0820209c0)
        D:/Go/src/main/main.go:19 +0x325
net/http.HandlerFunc.ServeHTTP(0x786560, 0x353210, 0xc082070460, 0xc0820209c0)
        c:/go/src/net/http/server.go:1265 +0x48
net/http.(*ServeMux).ServeHTTP(0xc08205c360, 0x353210, 0xc082070460, 0xc0820209c0)
        c:/go/src/net/http/server.go:1541 +0x184
net/http.serverHandler.ServeHTTP(0xc082044180, 0x353210, 0xc082070460, 0xc0820209c0)
        c:/go/src/net/http/server.go:1703 +0x1a1
net/http.(*conn).serve(0xc0820703c0)
        c:/go/src/net/http/server.go:1204 +0xb5e
created by net/http.(*Server).Serve
        c:/go/src/net/http/server.go:1751 +0x365
2015/07/01 13:53:15 http: panic serving 127.0.0.1:56998: runtime error: invalid memory address or nil pointer dereference
goroutine 17 [running]:
net/http.func·011()
        c:/go/src/net/http/server.go:1130 +0xc2
text/template.errRecover(0xc082067b48)
        c:/go/src/text/template/exec.go:100 +0xc3
text/template.(*Template).Execute(0x0, 0x353378, 0xc0820701e0, 0x6a5000, 0xc082008840, 0x0, 0x0)
        c:/go/src/text/template/exec.go:137 +0x249
main.func·001(0x353210, 0xc0820701e0, 0xc0820200d0)
        D:/Go/src/main/main.go:19 +0x325
net/http.HandlerFunc.ServeHTTP(0x786560, 0x353210, 0xc0820701e0, 0xc0820200d0)
        c:/go/src/net/http/server.go:1265 +0x48
net/http.(*ServeMux).ServeHTTP(0xc08205c360, 0x353210, 0xc0820701e0, 0xc0820200d0)
        c:/go/src/net/http/server.go:1541 +0x184
net/http.serverHandler.ServeHTTP(0xc082044180, 0x353210, 0xc0820701e0, 0xc0820200d0)
        c:/go/src/net/http/server.go:1703 +0x1a1
net/http.(*conn).serve(0xc082070000)
        c:/go/src/net/http/server.go:1204 +0xb5e
created by net/http.(*Server).Serve
        c:/go/src/net/http/server.go:1751 +0x365

template: test:2: function "Title" not defined

{{template "header" . Title}}

{{template "header" .Title}}