dcg_basics:csym//1

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Grammar rule csym//1

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csym(?Symbol:atom)// is semidet: Recognise a C identifier: an ASCII letter or underscore followed by ASCII letters, digits and underscores. This is the csymf and csym classification of code_type/2. Note that this does not cover identifiers holding non-ASCII characters; classify those with the prolog_atom_start and prolog_identifier_continue types.