html/template: does not call .String method for formatting

[the42]

What steps will reproduce the problem?
1. go run issue.go

What is the expected output?

test/ test/ test/
test/ test/ test/
<a href="test/"> - 1 - </a><a href="test/"> - 2 -
</a><a href="test/"> -3 - </a>

What do you see instead?
test/ test/ test/
<a href="%7b%20%20%3cnil%3e%20%20test/%20%20%7d>"> - 1 -
</a><a href="test/"> - 2 - </a><a
href="test/"> -3 - </a>

Which compiler are you using (5g, 6g, 8g, gccgo)?
go version weekly.2012-02-14 +43cf9b39b647


Which operating system are you using?
uname -a:
Linux ubuntu 3.0.0-16-generic #29-Ubuntu SMP Tue Feb 14 12:48:51 UTC 2012 x86_64 x86_64
x86_64 GNU/Linux

Which revision are you using?  (hg identify)


Please provide any additional information below.

Attachments:

1. issue.go (534 bytes)

[robpike]

Comment 1:

There's a spurious angle bracket inside the first element of htmlstr, but I don't think
it's the issue.

Labels changed: added priority-go1, go1-must, removed priority-triage.

Owner changed to builder@golang.org.

Status changed to Accepted.

[rsc]

Comment 2:

Shorter example:
package main
import (
    "log"
    "net/url"
    "html/template"
    "os"
)
func main() {
        u, _ := url.Parse("test/")
        if err := template.Must(template.New("x").Parse("{{.}}\n")).Execute(os.Stdout, u); err != nil {
        log.Fatal(err)
    }
}
prints
{  <nil>  test/  }
should print
test/
It is, for some reason, not calling u's String method.

[dsymonds]

Comment 4:

This is something unique to html/template; changing the import to text/template in rsc's
example results in the expected output.

[robpike]

Comment 5:

That may be why the subject is "html/template: ..." :)

[robpike]

Comment 6:

This issue was closed by revision 0ce6c87.

Status changed to Fixed.