commit https://github.com/vim/vim/commit/437bafe4c8a83ed71ee006eda7f54b65a90f0d4c Author: Bram Moolenaar <Bram@vim.org> Date: Mon Aug 1 15:40:54 2016 +0200 patch 7.4.2137 Problem: Using function() with a name will find another function when it is redefined. Solution: Add funcref(). Refer to lambda using a partial. Fix several reference counting issues.

--- a/src/testdir/test_lambda.vim
+++ b/src/testdir/test_lambda.vim
@@ -152,7 +152,7 @@ function! Test_lambda_delfunc()
   endfunction
 
   let l:F = s:gen()
-  call assert_fails(':call l:F()', 'E117:')
+  call assert_fails(':call l:F()', 'E933:')
 endfunction
 
 function! Test_lambda_scope()