## No matching case clause in Erlang Reports an error when none of the clauses of a `case` match the expression. Corresponds to the `{case_clause,V}` error in the Erlang runtime. For example, if we call `tail([])` and the full definition of `tail` is ```erlang tail(X) -> case X of [_|T] -> T end. ``` This error is reported if either the pattern(s) or the guard(s) prevent matching any of the clauses.