nl_tokens: Performs static type checking enables dynamic type checks .
pl_tokens: function F ( type , term ) { let original = term ; if ( term && ! term . __meta ) { term = type . wrap ? type . wrap ( term ) : term ; term . __meta = { } ; term . __name = function ( name ) { term . __meta . name = name ; return term ; } ; term . __desc = function ( desc ) { term . __meta . desc = desc ; return term ; } ; if ( term . __meta ) { term . __meta . term = original ; term . __meta . name = "anon" ; <mask> . __meta . desc = "no description" ; } ; } ; F . check ( type , term ) ; return term ; }