BadArityError exception (Elixir v1.19.0-rc.0)

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An exception raised when a function is called with the wrong number of arguments.

For example:

my_function = fn x, y -> x + y end
my_function.(42)
** (BadArityError) #Function<41.39164016/2 in :erl_eval.expr/6> with arity 2 called with 1 argument (42)