patch 8.2.2053: Vim9: lamba doesn't accept argument types Commit: https://github.com/vim/vim/commit/c2ca935d26b3fc64a13d4e7d0583fc787efe61d0 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Nov 25 21:30:11 2020 +0100 patch 8.2.2053: Vim9: lamba doesn't accept argument types Problem: Vim9: lamba doesn't accept argument types. Solution: Optionally accept argument types at the script level.

--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -1828,6 +1828,9 @@ def Test_expr7_lambda()
 
       assert_equal(false, LambdaUsingArg(0)())
       assert_equal(true, LambdaUsingArg(1)())
+
+      var res = map([1, 2, 3], {i: number, v: number -> i + v})
+      assert_equal([1, 3, 5], res)
   END
   CheckDefAndScriptSuccess(lines)