Implement Display formatter in terms of Debug

src/format.rs

@@ -72,13 +72,7 @@ impl std::fmt::Display for crate::VariableDeclaration
 {
 	fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
 	{
-		match &self.domain
-		{
-			crate::Domain::Program => write!(format, "X")?,
-			crate::Domain::Integer => write!(format, "N")?,
-		};
-
-		write!(format, "{}", &self.name)
+		write!(format, "{:?}", &self)
 	}
 }