worktree: disallow adding same path multiple times

diff --git a/diffcore.h b/diffcore.h
index 81281a398b4f218f22d1d9ed50df99589832fe83..8d81a45f510c0aed0cafcd3dce638f18fc6566f7 100644 (file)
--- a/diffcore.h
+++ b/diffcore.h
@@ -4,6 +4,10 @@
 #ifndef DIFFCORE_H
 #define DIFFCORE_H
 
+#include "cache.h"
+
+struct diff_options;
+
 /* This header file is internal between diff.c and its diff transformers
  * (e.g. diffcore-rename, diffcore-pickaxe).  Never include this header
  * in anything else.