SWI-Prolog -- API-function PL_put_nil

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PL_put_nil()

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Availability:C-language interface function

bool PL_put_nil(term_t -l)

Put the list terminator constant in l. Always returns TRUE. Note that in classical Prolog systems or in SWI-Prolog using the option --traditional, this is the same as PL_put_atom_chars("[]"). See section 5.1.