Nostrum.Snowflake.from_datetime-exclamation-mark

You're seeing just the function from_datetime-exclamation-mark, go back to Nostrum.Snowflake module for more information.
Link to this function

from_datetime!(datetime)

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Specs

from_datetime!(DateTime.t()) :: t() | no_return()

Same as from_datetime/1, except it raises an ArgumentError on failure.