patch 7.4.2305

Problem:    Marks, writefile and nested function tests are old style.
Solution:   Turn them into new style tests. (Yegappan Lakshmanan)

src/testdir/test_nested_function.vim

@@ -0,0 +1,32 @@
+"Tests for nested functions
+"
+function! NestedFunc()
+  fu! Func1()
+    let g:text .= 'Func1 '
+  endfunction
+  call Func1()
+  fu! s:func2()
+    let g:text .= 's:func2 '
+  endfunction
+  call s:func2()
+  fu! s:_func3()
+    let g:text .= 's:_func3 '
+  endfunction
+  call s:_func3()
+  let fn = 'Func4'
+  fu! {fn}()
+    let g:text .= 'Func4 '
+  endfunction
+  call {fn}()
+  let fn = 'func5'
+  fu! s:{fn}()
+    let g:text .= 's:func5'
+  endfunction
+  call s:{fn}()
+endfunction
+
+function! Test_nested_functions()
+  let g:text = ''
+  call NestedFunc()
+  call assert_equal('Func1 s:func2 s:_func3 Func4 s:func5', g:text)
+endfunction