patch 7.4.1712
Problem:    For plugins in packages, plugin authors need to take care of all
            dependencies.
Solution:   When loading "start" packages and for :packloadall, first add all
            directories to 'runtimepath' before sourcing plugins.
diff --git a/src/testdir/test_packadd.vim b/src/testdir/test_packadd.vim
index 9e75c33..66a344b 100644
--- a/src/testdir/test_packadd.vim
+++ b/src/testdir/test_packadd.vim
@@ -87,14 +87,39 @@
 endfunc
 
 func Test_packloadall()
-  let plugindir = &packpath . '/pack/mine/start/foo/plugin'
-  call mkdir(plugindir, 'p')
-  call writefile(['let g:plugin_foo_number = 1234'], plugindir . '/bar.vim')
+  " plugin foo with an autoload directory
+  let fooplugindir = &packpath . '/pack/mine/start/foo/plugin'
+  call mkdir(fooplugindir, 'p')
+  call writefile(['let g:plugin_foo_number = 1234',
+	\ 'let g:plugin_foo_auto = bbb#value',
+	\ 'let g:plugin_extra_auto = extra#value'], fooplugindir . '/bar.vim')
+  let fooautodir = &packpath . '/pack/mine/start/foo/autoload'
+  call mkdir(fooautodir, 'p')
+  call writefile(['let bar#value = 77'], fooautodir . '/bar.vim')
+
+  " plugin aaa with an autoload directory
+  let aaaplugindir = &packpath . '/pack/mine/start/aaa/plugin'
+  call mkdir(aaaplugindir, 'p')
+  call writefile(['let g:plugin_aaa_number = 333',
+	\ 'let g:plugin_aaa_auto = bar#value'], aaaplugindir . '/bbb.vim')
+  let aaaautodir = &packpath . '/pack/mine/start/aaa/autoload'
+  call mkdir(aaaautodir, 'p')
+  call writefile(['let bbb#value = 55'], aaaautodir . '/bbb.vim')
+
+  " plugin extra with only an autoload directory
+  let extraautodir = &packpath . '/pack/mine/start/extra/autoload'
+  call mkdir(extraautodir, 'p')
+  call writefile(['let extra#value = 99'], extraautodir . '/extra.vim')
+
   packloadall
   call assert_equal(1234, g:plugin_foo_number)
+  call assert_equal(55, g:plugin_foo_auto)
+  call assert_equal(99, g:plugin_extra_auto)
+  call assert_equal(333, g:plugin_aaa_number)
+  call assert_equal(77, g:plugin_aaa_auto)
 
   " only works once
-  call writefile(['let g:plugin_bar_number = 4321'], plugindir . '/bar2.vim')
+  call writefile(['let g:plugin_bar_number = 4321'], fooplugindir . '/bar2.vim')
   packloadall
   call assert_false(exists('g:plugin_bar_number'))