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

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An exception raised when no clauses in a cond/1 expression evaluate to a truthy value.

For example, this exception gets raised for a cond/1 like the following:

iex> cond do
...>   1 + 1 == 3 -> :woah
...>   nil -> "yeah this won't happen"
...> end
** (CondClauseError) no cond clause evaluated to a truthy value