Sourceror.Comments.merge_comments

You're seeing just the function merge_comments, go back to Sourceror.Comments module for more information.
Link to this function

merge_comments(quoted, comments)

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Specs

merge_comments(Macro.t(), [map()]) :: Macro.t()

Merges the comments into the given quoted expression. The comments are inserted into the metadata of their closest node. Comments in the same line of before a node are inserted into the :leading_comments field while comments that are right before an end keyword are inserted into the :trailing_comments field.