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Parse-additive-expression

Parse a additive-expression.

Signature
(parse-additive-expression token input) → (mv tree next-token rest-input)
Arguments: token — Guard (abnf::tree-optionp token).; input — Guard (abnf::tree-listp input).
Returns: tree — Type (abnf::tree-resultp tree).; next-token — Type (abnf::tree-optionp next-token).; rest-input — Type (abnf::tree-listp rest-input).