This reasonably useful function was hidden inside builtin-branch.c
@ -107,4 +107,5 @@ int read_graft_file(const char *graft_file);
extern struct commit_list *get_merge_bases(struct commit *rev1, struct commit *rev2, int cleanup);
int in_merge_bases(struct commit *rev1, struct commit *rev2);
#endif /* COMMIT_H */
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