Fix builtin function call disambiguation

In the case of multiple function candidates, if one was an exact match, it was incorrectly considered an ambiguous call.

src/language/utils/EmbeddedIDiscreteFunctionOperators.cpp

@@ -579,6 +579,8 @@ template <typename BinOperatorT, typename DataType, typename DiscreteFunctionT>
 std::shared_ptr<const IDiscreteFunction>
 applyBinaryOperationWithRightConstant(const DiscreteFunctionT& f, const DataType& a)
 {
+  Assert(f.descriptor().type() != DiscreteFunctionType::P0);
+
   using lhs_data_type = std::decay_t<typename DiscreteFunctionT::data_type>;
   using rhs_data_type = std::decay_t<DataType>;
 
@@ -600,6 +602,10 @@ template <typename BinOperatorT, size_t Dimension, typename DataType>
 std::shared_ptr<const IDiscreteFunction>
 applyBinaryOperationWithRightConstant(const std::shared_ptr<const IDiscreteFunction>& f, const DataType& a)
 {
+  if (f->descriptor().type() != DiscreteFunctionType::P0) {
+    throw NormalError(invalid_operands(f, a));
+  }
+
   switch (f->dataType()) {
   case ASTNodeDataType::bool_t:
   case ASTNodeDataType::unsigned_int_t: