text/template: printf with single argument from pipeline panics during Execute

[alotabits]

What does 'go version' print?

Playground 1.3.2

What steps reproduce the problem?
If possible, include a link to a program on play.golang.org.

1. http://play.golang.org/p/Dr3gVjctk6
or
2. http://play.golang.org/p/iKMQTtM3Vb

What happened?

1. panic
or
2. 12panic

What should have happened instead?
1. {{
or
2. 123

[ianlancetaylor]

Comment 1:

Labels changed: added repo-main, release-go1.5.

[gopherbot]

Comment 2:

CL https://golang.org/cl/161750043 mentions this issue.

[robpike]

Comment 3:

This issue was closed by revision 1cd78ee.

Status changed to Fixed.