text/template: extend {{range}} to support channels.

[gopherbot]

by krolaw:

At the moment, large outputs of formatted data, require the data in large memory
consuming arrays.  Adding channel support seems to be a natural fit to the templates
writer, as the channel could be filled by a reader.

In my case, I want to reformat/convert large binary logs.  Template library is a perfect
fit, except I must load the data into an array first using ram, which, unfortunately,
ram requirements do not allow (embedded device with large compact flash).

[kisielk]

Comment 1:

I think it's simply not documented. It looks like using channels in template range
statements works just fine:
http://play.golang.org/p/Ei_N5SRQcQ

[kisielk]

Comment 2:

I submitted https://golang.org/cl/7082044/ to clarify the docs.

[adg]

Comment 3:

This issue was closed by revision ad63c7e.

Status changed to Fixed.