Example
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The constraint $\type{String} \lessdot {\ntv{x}}$ is solved by applying
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\rulename{Super} and substituting $\type{String}$ for $\ntv{x}$.
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Input constraints originating from a completely untyped input program do not contain any existential types.
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Those are added during \unify{}.
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The only parts where existential types are created are the \rulename{Match} and \rulename{General} rules.
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\subsection{Description}
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The \unify{} algorithm tries to find a solution for a set of constraints like
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$\set{\exptype{List}{String} \lessdot \tv{a}, \exptype{List}{Integer} \lessdot \tv{a}}$.
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