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Description
When using t-call, a lot of bindings are assumed to be either from the template context, or supplied by callees. However, as a callee, it is impossible to know and remember all the possible bindings that have special meaning in the original templates.
A solution would be to collect all free bindings, i.e. identifiers used without a matching t-as or t-set definition, and allow completion/jumpdefs/references/etc.