Exception.format

You're seeing just the function format, go back to Exception module for more information.
Link to this function

format(kind, payload, stacktrace \\ [])

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Specs

format(kind(), any(), stacktrace()) :: String.t()

Normalizes and formats throw/errors/exits and stacktraces.

It relies on format_banner/3 and format_stacktrace/1 to generate the final format.

If kind is {:EXIT, pid}, it does not generate a stacktrace, as such exits are retrieved as messages without stacktraces.