Nostrum.Api.get_guild_member-exclamation-mark

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

get_guild_member!(guild_id, user_id)

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Specs

Same as get_guild_member/2, but raises Nostrum.Error.ApiError in case of failure.