Based on line 4, the function of the allusion is to convey an information: that the lovers were oblivious to the world around them.
In English literature, an allusion is a type of literary device and it can be defined as a reference in a text to a well known text, place, person, event, or thing.
This ultimately implies that, allusion avails an author the opportunity to compress (embed) a great deal of meaningful and significant information into a phrase or word such as "she felt like she had a golden heart."
In conclusion, the function of the allusion might best be understood to convey an information references the fact that the lovers were oblivious to the world around them.
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