What version of Go are you using?

go1.7

What operating system and processor architecture are you using?

linux/amd64

What did you do?

Defining a block between <title>-tags defines new templates when Executing the template.
See:
https://play.golang.org/p/mDvyONhj6A

What did you expect to see?

• Unchanged list of defined templates, as seen with text/template:
  https://play.golang.org/p/QMmQTsjkxA
• behaviour like with any other tag except <title>:
  https://play.golang.org/p/um4OqNRX3s
• No additional memory consumption

What did you see instead?

Added templates with names like titletext$htmltemplate_stateRCDATA_elementTitle$htmltemplate_stateRCDATA_elementTitle
Slowly fill up system memory