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  1. prune(A, B) :-
  2. union(A, B, B).
  3.  
  4. union([X|Y],Z,W) :- 
  5.   member(X,Z), 
  6.   !,        /* do not  use next clauses */
  7.   union(Y,Z,W). 
  8. union([X|Y],Z,[X|W]) :- union(Y,Z,W).
  9. union([],Z,Z).
  10.  
  11.  
  12. ?- prune([1,1,1,2],R).
  13.  
  14.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.pl:12:4: syntax error: . or operator expected after expression
	1 error(s)
compilation failed
stdout
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Standard output is empty
https://ideone.com/BePDb
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

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