IEx.Pry.whereami

You're seeing just the function whereami, go back to IEx.Pry module for more information.
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whereami(file, line, radius)

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Formats the location for whereami/3 prying.

It receives the file, line and the snippet radius and returns {:ok, lines}, where lines is a list of chardata containing each formatted line, or :error.

The actual line is especially formatted in bold.