Merge branch 'mm/mv-file-to-no-such-dir-with-slash'

Finishing touches to do the same on windows.

* mm/mv-file-to-no-such-dir-with-slash:
  mv: let 'git mv file no-such-dir/' error out on Windows, too

builtin/mv.c

@@ -214,6 +214,8 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
 			}
 		} else if (string_list_has_string(&src_for_dst, dst))
 			bad = _("multiple sources for the same target");
+		else if (is_dir_sep(dst[strlen(dst) - 1]))
+			bad = _("destination directory does not exist");
 		else
 			string_list_insert(&src_for_dst, dst);