cleanup code generation, add throw/catch, copy_term, var, atomic, not, false builtins

src/prolog/fixtures.rs

@@ -214,7 +214,11 @@ impl<'a> VariableFixtures<'a>
         self.0.values()
     }
 
-    pub fn set_perm_vals(&self, has_deep_cuts: bool)
+    pub fn size(&self) -> usize {
+        self.0.len()
+    }
+    
+    pub fn set_perm_vals(&self, has_deep_cuts: bool, has_catch: bool)
     {
         let mut values_vec : Vec<_> = self.values()
             .filter_map(|ref v| {
@@ -227,7 +231,7 @@ impl<'a> VariableFixtures<'a>
 
         values_vec.sort_by_key(|ref v| v.0);
 
-        let offset = has_deep_cuts as usize;
+        let offset = has_deep_cuts as usize + 2 * has_catch as usize;
 
         for (i, (_, cells)) in values_vec.into_iter().rev().enumerate() {
             for cell in cells {