Credo.Execution.ensure_execution_struct

You're seeing just the function ensure_execution_struct, go back to Credo.Execution module for more information.
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ensure_execution_struct(value, fun_name)

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Ensures that the given value is a %Credo.Execution{} struct, raises an error otherwise.

Example:

exec
|> mod.init()
|> Credo.Execution.ensure_execution_struct("#{mod}.init/1")