If true, names in scope will be added to a new, isolated scope before
analyzing any child templates, without access to the parent template's scope.
The name of the partial template. We need this to make sure we only analyze each template once.
A list of names that will be in scope for the child template.
If an item is a [string, Argument] tuple, the string is considered an alias for the argument.
Scope information used when analyzing partial templates.