extern int get_sha1_treeish(const char *str, unsigned char *sha1);
extern int get_sha1_blob(const char *str, unsigned char *sha1);
extern void maybe_die_on_misspelt_object_name(const char *name, const char *prefix);
-extern int get_sha1_with_context(const char *str, unsigned flags, unsigned char *sha1, struct object_context *orc);
+extern int get_sha1_with_context(const char *str, unsigned flags, unsigned char *sha1, struct object_context *oc);
extern int get_oid(const char *str, struct object_id *oid);