Credo.CLI.Filename.contains_line_no-question-mark

You're seeing just the function contains_line_no-question-mark, go back to Credo.CLI.Filename module for more information.
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contains_line_no?(filename)

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Returns true if a given filename contains a pos_suffix.

iex> Credo.CLI.Filename.contains_line_no?("lib/credo/sources.ex:39:8")
true

iex> Credo.CLI.Filename.contains_line_no?("lib/credo/sources.ex:39")
true

iex> Credo.CLI.Filename.contains_line_no?("lib/credo/sources.ex")
false