Our team studies the consistent edits of git during evolution. And we find several missed edits in the latest release of git. For example, there are two consist edits we have figured out from historical commits:
1) . Version: git 2.3.9 – git-2.3.10
       File: builtin/merge-tree.c

 	dst.size = size;
-	xdi_diff(&src, &dst, &xpp, &xecfg, &ecb);
+	if (xdi_diff(&src, &dst, &xpp, &xecfg, &ecb))
+		die("unable to generate diff");
 	free(src.ptr);
 	free(dst.ptr);
 }

2) .Version: git 2.3.9 – git-2.3.10
      File: combine-diff.c
  
-	xdi_diff_outf(&parent_file, result_file, consume_line, &state,
-		      &xpp, &xecfg);
+	if (xdi_diff_outf(&parent_file, result_file, consume_line, &state,
+			  &xpp, &xecfg))
+		die("unable to generate combined diff for %s",
+		    sha1_to_hex(parent));
 	free(parent_file.ptr);

Those two commits both add if structure and log messages for handling the return value of xdi_diff_outf(). 
And in the latest release, we find one candidate that may also need log statements inserted:
1)  File: git-2.14.2/builtin/rerere.c
    
     1	static int diff_two(const char *file1, const char *label1,
     2			const char *file2, const char *label2)
     3	{
….
    20		ret = xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
    21	
    22		free(minus.ptr);
    23		free(plus.ptr);
    24		return ret;
    25	}
...
}

There are more examples of consistent update and corresponding suggestions in attachment. It is so nice of you to read them and share me with your opinion on the correctness of our suggestion. Thanks a lot.