Credo.CLI.Output.priority_arrow

You're seeing just the function priority_arrow, go back to Credo.CLI.Output module for more information.
Link to this function

priority_arrow(issue_or_priority)

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Returns a suitable arrow for a given priority.

iex> Credo.CLI.Output.priority_arrow(:high)
"↗"

iex> Credo.CLI.Output.priority_arrow(10)
"↗"

iex> Credo.CLI.Output.priority_arrow(%Credo.Issue{priority: 10})
"↗"