Check name collissions

autoload/vundle/config.vim

@@ -7,6 +7,9 @@
 " ---------------------------------------------------------------------------
 func! vundle#config#bundle(arg, ...)
   let bundle = vundle#config#init_bundle(a:arg, a:000)
+  if !s:check_bundle_name(bundle)
+    return
+  endif
   if exists('g:vundle_lazy_load') && g:vundle_lazy_load
     call add(g:bundles, bundle)
   else
@@ -40,6 +43,7 @@ func! vundle#config#init()
   if !exists('g:bundles') | let g:bundles = [] | endif
   call s:rtp_rm_a()
   let g:bundles = []
+  let g:bundle_names = {}
 endf
 
 
@@ -79,6 +83,26 @@ func! vundle#config#init_bundle(name, opts)
 endf
 
 
+" ---------------------------------------------------------------------------
+" Check if the current bundle name has already been used in this running
+" instance and show an error to that effect.
+"
+" bundle -- a bundle object whose name is to be checked
+" return -- 0 if the bundle's name has been seen before, 1 otherwise
+" ---------------------------------------------------------------------------
+funct! s:check_bundle_name(bundle)
+  if has_key(g:bundle_names, a:bundle.name)
+    echoerr 'Vundle error: Name collision for Plugin ' . a:bundle.name_spec .
+          \ '. Plugin ' . g:bundle_names[a:bundle.name] .
+          \ ' previously used the name "' . a:bundle.name . '"' .
+          \ '. Skipping Plugin ' . a:bundle.name_spec . '.'
+    return 0
+  endif
+  let g:bundle_names[a:bundle.name] = a:bundle.name_spec
+  return 1
+endf
+
+
 " ---------------------------------------------------------------------------
 " Parse the options which can be supplied with the bundle specification.
 " Corresponding documentation: vundle-plugins-configure