patch 9.0.1157: "implements" only handles one interface name Commit: https://github.com/vim/vim/commit/df8f9473596c8fb18ec893de677dba455e8925b3 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jan 7 14:51:03 2023 +0000 patch 9.0.1157: "implements" only handles one interface name Problem: "implements" only handles one interface name. Solution: Handle a comma separated list of names. Check for duplicate names.