patch 9.0.1822: Vim9: no check for duplicate members in extended classes Commit: https://github.com/vim/vim/commit/e3b6c78ddc4acf238af35d7fac585e7ead27392f Author: Yegappan Lakshmanan <yegappan@yahoo.com> Date: Tue Aug 29 22:32:02 2023 +0200 patch 9.0.1822: Vim9: no check for duplicate members in extended classes Problem: Vim9: no check for duplicate members in extended classes Solution: Check for duplicate members in extended classes. Fix memory leak. closes: #12948 Signed-off-by: Christian Brabandt <cb@256bit.org> Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>