Don't append return to void procedures

include/elna/gcc/elna-generic.h

@@ -31,6 +31,9 @@ namespace gcc
         void enter_scope();
         tree_symbol_mapping leave_scope();
 
+        void build_binarary_operation(bool condition, source::binary_expression *expression,
+            tree_code operator_code, tree left, tree right, tree target_type);
+
     public:
         generic_visitor();
 

include/elna/source/ast.h

@@ -24,12 +24,15 @@ namespace source
         less,
         greater,
         less_equal,
-        greater_equal
+        greater_equal,
+        disjunction,
+        conjunction
     };
 
     enum class unary_operator
     {
-        reference
+        reference,
+        negation
     };
 
     class variable_declaration;