--- a/src/ast_dump.rs
+++ b/src/ast_dump.rs
@@ -68,6 +68,19 @@ fn make_indent(indent: usize) -> String 
 impl Statement {
     fn to_string(&self, indent: usize) -> String {
         match self.clone() {
+            Statement::ClassDef(name, classes, body) => format!("{}def {}({}):\n{}", make_indent(indent), name, {
+                let mut bases = vec!();
+                for class in classes {
+                    bases.push(class.to_string());
+                }
+                bases.join(", ")
+            }, {
+                let mut statements = vec!();
+                for statement in body {
+                    statements.push(statement.to_string(indent + 1));
+                }
+                statements.join("\n")
+            }),
             Statement::FunctionDef(Expr::Name(name), arguments, body) => format!("{}def {}({}):\n{}", make_indent(indent), name, {
                 let mut args = vec!();
                 for arg in arguments {