iteration loop doesn't recognize page level data

[stephenhu]

if i pass a struct into an amber template, i can't seem to access the variables inside of an iteration block:

let's say i have this struct:

type Foo struct {
ID string
OK bool
Bar []string
}

// initialized here
f = Foo{ID: "abc", OK: true, Bar: make([]string){"ddd", "eee"}}

passed into the template.Execute function:

template.Execute(w, f)

i can do the following without any issues:
h3 #{ID} // h3 abc

but if i do this:

each $i in Bar
h3 #{$i} // works fine
h3 #{ID} // causes an Amber Error <>: Unable to parse expression

exact error is:
Amber Error in <static/templates/viewteam.amber>: Unable to parse expression. - Line: 62, Column: 21, Length: 2

[stephenhu]

there's a workaround which is to assign the page level variable to a variable:

e.g.

$id = ID

each $i in Bar
h3 #{$i} // works fine
h3 #{$id} // this works

[stephenhu]

i would say this is a fairly serious limitation, seems nested loops or nested maps also have the same issue and the work around is not very apparent to me at the moment.