patch 8.2.4612: Vim9: cannot use a recursive call in a nested function Commit: https://github.com/vim/vim/commit/a915fa010330ee7212e06d3511acd363d04d2d28 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Mar 23 11:29:15 2022 +0000 patch 8.2.4612: Vim9: cannot use a recursive call in a nested function Problem: Vim9: cannot use a recursive call in a nested function. (Sergey Vlasov) Solution: Define the funcref before compiling the function. (closes #9989)

--- a/src/vim9expr.c
+++ b/src/vim9expr.c
@@ -1040,7 +1040,7 @@ compile_lambda(char_u **arg, cctx_T *cct
 	// The function reference count will be 1.  When the ISN_FUNCREF
 	// instruction is deleted the reference count is decremented and the
 	// function is freed.
-	return generate_FUNCREF(cctx, ufunc);
+	return generate_FUNCREF(cctx, ufunc, NULL);
     }
 
     func_ptr_unref(ufunc);