patch 8.2.2926: Vim9: no good error for using :legacy in a :def function Commit: https://github.com/vim/vim/commit/c3cb1c92a335be818971acd89f631e82aa30ad3f Author: Bram Moolenaar <Bram@vim.org> Date: Wed Jun 2 16:47:53 2021 +0200 patch 8.2.2926: Vim9: no good error for using :legacy in a :def function Problem: Vim9: no good error for using :legacy in a :def function. Solution: Give an explicit error where :legacy is not working. (closes #8309)

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