You forgot the bit about placing them in the data structure to being with.
I made it not clear I think.
This structure is initialized when a new lexial scope is encountered (pointing back to the enclosing environment) and new variable bindings are added whenever a new lexial variable is defined.
It exists whether or nor a closure is created.
All closures within this context then simply remember a reference to this structure and use it to look up variables.
But Perl evidently does it differently it does not really matter..
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