Rust: fix regression in getFormat indexing

rust/ql/lib/codeql/rust/elements/internal/FormatArgsExprImpl.qll

@@ -25,7 +25,8 @@ module Impl {
    */
   class FormatArgsExpr extends Generated::FormatArgsExpr {
     override Format getFormat(int index) {
-      result.getParent() = this and result.getIndex() = index + 1
+      result =
+        rank[index + 1](Format f, int i | f.getParent() = this and f.getIndex() = i | f order by i)
     }
   }
 }

rust/ql/test/extractor-tests/generated/FormatArgsExpr/FormatArgsExpr_getFormat.expected

@@ -1,9 +1,9 @@
 | gen_format.rs:5:14:5:32 | FormatArgsExpr | 0 | gen_format.rs:5:21:5:22 | {} |
 | gen_format_args_expr.rs:6:17:6:37 | FormatArgsExpr | 0 | gen_format_args_expr.rs:6:19:6:20 | {} |
-| gen_format_args_expr.rs:6:17:6:37 | FormatArgsExpr | 2 | gen_format_args_expr.rs:6:26:6:29 | {:?} |
+| gen_format_args_expr.rs:6:17:6:37 | FormatArgsExpr | 1 | gen_format_args_expr.rs:6:26:6:29 | {:?} |
 | gen_format_args_expr.rs:7:17:7:43 | FormatArgsExpr | 0 | gen_format_args_expr.rs:7:19:7:21 | {b} |
-| gen_format_args_expr.rs:7:17:7:43 | FormatArgsExpr | 2 | gen_format_args_expr.rs:7:27:7:31 | {a:?} |
+| gen_format_args_expr.rs:7:17:7:43 | FormatArgsExpr | 1 | gen_format_args_expr.rs:7:27:7:31 | {a:?} |
 | gen_format_args_expr.rs:9:17:9:28 | FormatArgsExpr | 0 | gen_format_args_expr.rs:9:19:9:21 | {x} |
-| gen_format_args_expr.rs:9:17:9:28 | FormatArgsExpr | 2 | gen_format_args_expr.rs:9:24:9:26 | {y} |
+| gen_format_args_expr.rs:9:17:9:28 | FormatArgsExpr | 1 | gen_format_args_expr.rs:9:24:9:26 | {y} |
 | gen_format_argument.rs:5:14:5:47 | FormatArgsExpr | 0 | gen_format_argument.rs:5:21:5:46 | {value:#width$.precision$} |
 | gen_format_argument.rs:7:14:7:56 | FormatArgsExpr | 0 | gen_format_argument.rs:7:21:7:30 | {0:#1$.2$} |

rust/ql/test/library-tests/formatstrings/FormatTemplate.expected

@@ -2,20 +2,20 @@ getFormat
 | main.rs:5:14:5:61 | FormatArgsExpr | main.rs:5:21:5:46 | {value:#width$.precision$} | 0 |
 | main.rs:6:14:6:56 | FormatArgsExpr | main.rs:6:21:6:30 | {0:#1$.2$} | 0 |
 | main.rs:7:14:7:40 | FormatArgsExpr | main.rs:7:21:7:22 | {} | 0 |
-| main.rs:7:14:7:40 | FormatArgsExpr | main.rs:7:24:7:25 | {} | 2 |
+| main.rs:7:14:7:40 | FormatArgsExpr | main.rs:7:24:7:25 | {} | 1 |
 | main.rs:11:14:11:34 | FormatArgsExpr | main.rs:11:22:11:23 | {} | 0 |
 | main.rs:12:14:12:34 | FormatArgsExpr | main.rs:12:29:12:30 | {} | 0 |
 | main.rs:13:14:13:27 | FormatArgsExpr | main.rs:13:15:13:18 | {:?} | 0 |
 | main.rs:14:14:14:33 | FormatArgsExpr | main.rs:14:15:14:21 | {value} | 0 |
 | main.rs:16:14:16:30 | FormatArgsExpr | main.rs:16:21:16:28 | {people} | 0 |
 | main.rs:17:14:17:26 | FormatArgsExpr | main.rs:17:15:17:16 | {} | 0 |
-| main.rs:17:14:17:26 | FormatArgsExpr | main.rs:17:18:17:19 | {} | 2 |
+| main.rs:17:14:17:26 | FormatArgsExpr | main.rs:17:18:17:19 | {} | 1 |
 | main.rs:18:14:18:24 | FormatArgsExpr | main.rs:18:15:18:19 | {:04} | 0 |
 | main.rs:19:14:19:32 | FormatArgsExpr | main.rs:19:15:19:19 | {:#?} | 0 |
 | main.rs:21:14:21:34 | FormatArgsExpr | main.rs:21:15:21:17 | {1} | 0 |
-| main.rs:21:14:21:34 | FormatArgsExpr | main.rs:21:19:21:20 | {} | 2 |
-| main.rs:21:14:21:34 | FormatArgsExpr | main.rs:21:22:21:24 | {0} | 4 |
-| main.rs:21:14:21:34 | FormatArgsExpr | main.rs:21:26:21:27 | {} | 6 |
+| main.rs:21:14:21:34 | FormatArgsExpr | main.rs:21:19:21:20 | {} | 1 |
+| main.rs:21:14:21:34 | FormatArgsExpr | main.rs:21:22:21:24 | {0} | 2 |
+| main.rs:21:14:21:34 | FormatArgsExpr | main.rs:21:26:21:27 | {} | 3 |
 | main.rs:22:14:22:31 | FormatArgsExpr | main.rs:22:21:22:24 | {:5} | 0 |
 | main.rs:23:14:23:35 | FormatArgsExpr | main.rs:23:21:23:25 | {:1$} | 0 |
 | main.rs:24:14:24:36 | FormatArgsExpr | main.rs:24:21:24:26 | {1:0$} | 0 |
@@ -33,25 +33,25 @@ getFormat
 | main.rs:36:24:36:41 | FormatArgsExpr | main.rs:36:31:36:35 | {:05} | 0 |
 | main.rs:37:24:37:38 | FormatArgsExpr | main.rs:37:25:37:32 | {:#010x} | 0 |
 | main.rs:39:14:39:45 | FormatArgsExpr | main.rs:39:21:39:23 | {0} | 0 |
-| main.rs:39:14:39:45 | FormatArgsExpr | main.rs:39:28:39:33 | {1:.5} | 2 |
+| main.rs:39:14:39:45 | FormatArgsExpr | main.rs:39:28:39:33 | {1:.5} | 1 |
 | main.rs:41:14:41:49 | FormatArgsExpr | main.rs:41:21:41:23 | {1} | 0 |
-| main.rs:41:14:41:49 | FormatArgsExpr | main.rs:41:28:41:34 | {2:.0$} | 2 |
+| main.rs:41:14:41:49 | FormatArgsExpr | main.rs:41:28:41:34 | {2:.0$} | 1 |
 | main.rs:43:14:43:49 | FormatArgsExpr | main.rs:43:21:43:23 | {0} | 0 |
-| main.rs:43:14:43:49 | FormatArgsExpr | main.rs:43:28:43:34 | {2:.1$} | 2 |
+| main.rs:43:14:43:49 | FormatArgsExpr | main.rs:43:28:43:34 | {2:.1$} | 1 |
 | main.rs:45:14:45:46 | FormatArgsExpr | main.rs:45:21:45:22 | {} | 0 |
-| main.rs:45:14:45:46 | FormatArgsExpr | main.rs:45:27:45:31 | {:.*} | 2 |
+| main.rs:45:14:45:46 | FormatArgsExpr | main.rs:45:27:45:31 | {:.*} | 1 |
 | main.rs:47:14:47:48 | FormatArgsExpr | main.rs:47:21:47:23 | {1} | 0 |
-| main.rs:47:14:47:48 | FormatArgsExpr | main.rs:47:28:47:33 | {2:.*} | 2 |
+| main.rs:47:14:47:48 | FormatArgsExpr | main.rs:47:28:47:33 | {2:.*} | 1 |
 | main.rs:48:14:48:47 | FormatArgsExpr | main.rs:48:21:48:22 | {} | 0 |
-| main.rs:48:14:48:47 | FormatArgsExpr | main.rs:48:27:48:32 | {2:.*} | 2 |
+| main.rs:48:14:48:47 | FormatArgsExpr | main.rs:48:27:48:32 | {2:.*} | 1 |
 | main.rs:49:14:49:72 | FormatArgsExpr | main.rs:49:21:49:22 | {} | 0 |
-| main.rs:49:14:49:72 | FormatArgsExpr | main.rs:49:27:49:41 | {number:.prec$} | 2 |
+| main.rs:49:14:49:72 | FormatArgsExpr | main.rs:49:27:49:41 | {number:.prec$} | 1 |
 | main.rs:52:9:55:22 | FormatArgsExpr | main.rs:52:10:52:11 | {} | 0 |
-| main.rs:52:9:55:22 | FormatArgsExpr | main.rs:52:15:52:23 | {name:.*} | 2 |
+| main.rs:52:9:55:22 | FormatArgsExpr | main.rs:52:15:52:23 | {name:.*} | 1 |
 | main.rs:58:9:61:24 | FormatArgsExpr | main.rs:58:10:58:11 | {} | 0 |
-| main.rs:58:9:61:24 | FormatArgsExpr | main.rs:58:15:58:23 | {name:.*} | 2 |
+| main.rs:58:9:61:24 | FormatArgsExpr | main.rs:58:15:58:23 | {name:.*} | 1 |
 | main.rs:64:9:67:24 | FormatArgsExpr | main.rs:64:10:64:11 | {} | 0 |
-| main.rs:64:9:67:24 | FormatArgsExpr | main.rs:64:15:64:25 | {name:>8.*} | 2 |
+| main.rs:64:9:67:24 | FormatArgsExpr | main.rs:64:15:64:25 | {name:>8.*} | 1 |
 | main.rs:70:12:70:31 | FormatArgsExpr | main.rs:70:13:70:20 | {0:.1$e} | 0 |
 | main.rs:71:12:71:31 | FormatArgsExpr | main.rs:71:13:71:20 | {0:.1$e} | 0 |
 | main.rs:73:14:73:35 | FormatArgsExpr | main.rs:73:28:73:29 | {} | 0 |