html/template: unidentified node type in allIdents

[dvyukov]

The following program crashes with panic:

package main

import (
    "html/template"
    "io/ioutil"
)

func main() {
    t, err := template.New("foo").Parse(string(data))
    if err != nil {
        return
    }
    t.Execute(ioutil.Discard, nil)
}

var data = "{{.|. urlquery}}"

panic: unidentified node type in allIdents

goroutine 1 [running]:
html/template.allIdents(0x7fc2b1c021e8, 0xc20800e480, 0x0, 0x0, 0x0)
    src/html/template/escape.go:216 +0x1f3
html/template.ensurePipelineContains(0xc208012190, 0xc208014b10, 0x1, 0x3)
    src/html/template/escape.go:242 +0x1ca
html/template.(*escaper).commit(0xc208010500)
    src/html/template/escape.go:749 +0x36e
html/template.escapeTemplate(0xc2080146f0, 0x7fc2b1c022c0, 0xc2080147e0, 0x5ba240, 0x3, 0x0, 0x0)
    src/html/template/escape.go:39 +0x510
html/template.(*Template).escape(0xc2080146f0, 0x0, 0x0)
    src/html/template/template.go:85 +0x35d
html/template.(*Template).Execute(0xc2080146f0, 0x7fc2b1c021c0, 0xc20800a4c0, 0x0, 0x0, 0x0, 0x0)
    src/html/template/template.go:101 +0x37
main.main()
    /tmp/htmltempl.go:13 +0x290

on commit ccc76db

[gopherbot]

CL https://golang.org/cl/9626 mentions this issue.