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FieldGrammar backend for production of full BNF of particular Cabal grammar. #7545

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FieldGrammar backend for production of full BNF of particular Cabal grammar.#7545
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Cabal: parserexact-printtype: enhancement
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Considered for 3.16
@gbaz

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@gbaz
gbaz
opened on Aug 14, 2021

Since a FieldGrammar is constructed in the tagless style, we can give it multiple semantics as backends. A useful one would be a BNF spec of the full grammar described, suitable for reference and consumption elsewhere.

Related: #4965

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