Review the correctness and documentation of setFunctionVarRefs

[zapateo]

Review the correctness and documentation of:

scriggo/internal/compiler/emitter_util.go

Line 266 in fdec5b8

func (em *emitter) setFunctionVarRefs(fn *runtime.Function, closureVars []ast.Upvar) {

This is because the terminology used within this method appears a bit different from the rest of the code. Is this just a misunderstanding in its interpretation, or does it actually express different concepts or handle things differently than other parts of the code, thus hiding potential errors?

It is therefore necessary to delve into this function well, understand what it is supposed to do and evaluate whether it is necessary to make changes.