View Source Matcha.Context.Match (Matcha v0.1.10)
Functions and operators that :match match specs can use.
Specs created in this are unique in that they can differentiate
between specs that fail to find a matching clause for the given input,
and specs with matching clauses that literally return the false value.
They return :no_match in the former case, and {:matched, result} tuples in the latter,
where result can be a literal false returned from a clause.