Extracted construction of carts to separate function

src/parser.rs

@@ -197,7 +197,7 @@ impl<'source> Parser<'source> {
                     },
                     start..self.lexer.span().end,
                 )),
-                None => todo!("cart construction"),
+                None => Ok(Expr::new(self.cart_flow()?, start..self.lexer.span().end)),
             },
 
             // Operations
@@ -231,6 +231,11 @@ impl<'source> Parser<'source> {
         }
     }
 
+    /// Flow for creating carts
+    fn cart_flow(&mut self) -> Result<ExprKind, Error> {
+        todo!("cart construction")
+    }
+
     /// Flow for operators
     ///
     /// Generates operation from LHS buffer and next expression as RHS