mutation — why your code mysteriously breaks5 / 8

mutation and the action-at-a-distance bug

Cursor wrote a function that's supposed to return a new list with one extra item, leaving the original alone. The line that copies the list is missing the right method. Fill in the method name (no parens).

Method:

⌘↵ runs the editor.

Booting Python…

Output

[promptdojo:~]$ _