XPost: comp.theory, sci.math, comp.lang.prolog   
   From: tristan.wibberley+netnews2@alumni.manchester.ac.uk   
      
   On 10/12/2025 14:10, olcott wrote:   
      
   > BEGIN:(Clocksin & Mellish 2003:254)   
   > Finally, a note about how Prolog matching sometimes differs   
   > from the unification used in Resolution. Most Prolog systems   
   ...   
      
   > 1 The Prolog standard states that the result is undefined if   
   > a Prolog system attempts to match a term against an uninstantiated   
   > subterm of itself, which means that programs which cause this to   
   > happen will not be portable. A portable program should ensure that   
   > wherever an occurs check might be applicable the built-in predicate   
   > unify_with_occurs_check/2 is used explicitly instead of the normal   
   > unification operation of the Prolog implementation. As its name   
   > suggests, this predicate acts like =/2 except that it fails if an   
   > occurs check detects an illegal attempt to instantiate a variable.   
   > END:(Clocksin & Mellish 2003:254)   
   >   
   > Clocksin, W.F. and Mellish, C.S. 2003. Programming in Prolog   
   > Using the ISO Standard Fifth Edition, 254. Berlin Heidelberg:   
   > Springer-Verlag.   
      
      
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