vim-patch:8.0.1378: autoload script sources itself when defining function

Problem:    Autoload script sources itself when defining function.
Solution:   Pass TFN_NO_AUTOLOAD to trans_function_name(). (Yasuhiro
            Matsumoto, closes vim/vim#2423)
3388d33457

src/nvim/eval.c

@@ -19820,7 +19820,7 @@ void ex_function(exarg_T *eap)
   // s:func      script-local function name
   // g:func      global function name, same as "func"
   p = eap->arg;
-  name = trans_function_name(&p, eap->skip, 0, &fudi, NULL);
+  name = trans_function_name(&p, eap->skip, TFN_NO_AUTOLOAD, &fudi, NULL);
   paren = (vim_strchr(p, '(') != NULL);
   if (name == NULL && (fudi.fd_dict == NULL || !paren) && !eap->skip) {
     /*

src/nvim/testdir/sautest/autoload/sourced.vim

@@ -0,0 +1,3 @@
+let g:loaded_sourced_vim += 1
+func! sourced#something()
+endfunc

src/nvim/testdir/test_autoload.vim

@@ -2,10 +2,16 @@
 
 set runtimepath=./sautest
 
-func! Test_autoload_dict_func()
+func Test_autoload_dict_func()
   let g:loaded_foo_vim = 0
   let g:called_foo_bar_echo = 0
   call g:foo#bar.echo()
   call assert_equal(1, g:loaded_foo_vim)
   call assert_equal(1, g:called_foo_bar_echo)
 endfunc
+
+func Test_source_autoload()
+  let g:loaded_sourced_vim = 0
+  source sautest/autoload/sourced.vim
+  call assert_equal(1, g:loaded_sourced_vim)
+endfunc