Rust: More path resolution improvements

rust/ql/lib/codeql/rust/internal/PathResolution.qll

@@ -116,7 +116,7 @@
   }
 
   pragma[nomagic]
-  private ItemNode getASuccessorRec(string name) {
+  ItemNode getASuccessorRec(string name) {
     sourceFileEdge(this, name, result)
     or
     this = result.getImmediateParent() and
@@ -613,11 +613,11 @@
 }
 
 /**
- * Holds if `m` is a `mod name;` module declaration happening in a file named
- * `fileName.rs`, inside the folder `parent`.
+ * Holds if `m` is a `mod name;` module declaration, where the corresponding
+ * module file needs to be looked up in `lookup` or one of its descandants.
  */
-private predicate modImport(Module m, string fileName, string name, Folder parent) {
-  exists(File f |
+private predicate modImport0(Module m, string name, Folder lookup) {
+  exists(File f, Folder parent, string fileName |
     f = m.getFile() and
     not m.hasItemList() and
     // TODO: handle
@@ -629,17 +629,63 @@
     name = m.getName().getText() and
     parent = f.getParentContainer() and
     fileName = f.getStem()
+  |
+    // sibling import
+    lookup = parent and
+    (
+      m.getFile() = any(CrateItemNode c).getModuleNode().(SourceFileItemNode).getFile()
+      or
+      m.getFile().getBaseName() = "mod.rs"
+    )
+    or
+    // child import
+    lookup = parent.getFolder(fileName)
+  )
+}
+
+/**
+ * Holds if `m` is a `mod name;` module declaration, which happens inside a
+ * nested module, and `pred -> succ` is a module edge leading to `m`.
+ */
+private predicate modImportNested(ModuleItemNode m, ModuleItemNode pred, ModuleItemNode succ) {
+  pred.getAnItemInScope() = succ and
+  (
+    modImport0(m, _, _) and
+    succ = m
+    or
+    modImportNested(m, succ, _)
+  )
+}
+
+/**
+ * Holds if `m` is a `mod name;` module declaration, which happens inside a
+ * nested module, where `ancestor` is a reflexive transitive ancestor module
+ * of `m` with corresponding lookup folder `lookup`.
+ */
+private predicate modImportNestedLookup(Module m, ModuleItemNode ancestor, Folder lookup) {
+  modImport0(m, _, lookup) and
+  modImportNested(m, ancestor, _) and
+  not modImportNested(m, _, ancestor)
+  or
+  exists(ModuleItemNode m1, Folder mid |
+    modImportNestedLookup(m, m1, mid) and
+    modImportNested(m, m1, ancestor) and
+    lookup = mid.getFolder(m1.getName())
   )
 }
 
 /** Holds if `m` is a `mod name;` item importing file `f`. */
 private predicate fileImport(Module m, SourceFile f) {
-  exists(string fileName, string name, Folder parent | modImport(m, fileName, name, parent) |
-    // sibling import
+  exists(string name, Folder parent |
+    modImport0(m, name, _) and
     fileModule(f, name, parent)
+  |
+    // `m` is not inside a nested module
+    modImport0(m, name, parent) and
+    not modImportNested(m, _, _)
     or
-    // child import
-    fileModule(f, name, parent.getFolder(fileName))
+    // `m` is inside a nested module
+    modImportNestedLookup(m, m, parent)
   )
 }
 
@@ -651,7 +697,7 @@
 private predicate fileImportEdge(Module mod, string name, ItemNode item) {
   exists(SourceFileItemNode f |
     fileImport(mod, f) and
-    item = f.getASuccessor(name)
+    item = f.getASuccessorRec(name)
   )
 }
 
@@ -660,7 +706,7 @@
  */
 pragma[nomagic]
 private predicate crateDefEdge(CrateItemNode c, string name, ItemNode i) {
-  i = c.getModuleNode().getASuccessor(name) and
+  i = c.getModuleNode().getASuccessorRec(name) and
   not i instanceof Crate
 }
 
@@ -742,7 +788,16 @@
     // lookup in an outer scope, but only if the item is not declared in inner scope
     exists(ItemNode mid |
       unqualifiedPathLookup(p, name, ns, mid) and
-      not declares(mid, ns, name)
+      not declares(mid, ns, name) and
+      not name = ["super", "self"] and
+      not (
+        name = "Self" and
+        mid = any(ImplOrTraitItemNode i).getAnItemInSelfScope()
+      ) and
+      not (
+        name = "crate" and
+        mid = any(CrateItemNode i).getASourceFile()
+      )
     |
       // nested modules do not have unqualified access to items from outer modules,
       // except for items declared at top-level in the source file
@@ -906,7 +961,7 @@
     mid = resolveUseTreeListItem(use, midTree) and
     tree = midTree.getUseTreeList().getAUseTree() and
     isUseTreeSubPathUnqualified(tree, path, pragma[only_bind_into](name)) and
     result = mid.getASuccessor(pragma[only_bind_into](name))
   )
   or
   exists(ItemNode q, string name |
@@ -943,15 +998,19 @@
         encl.getADescendant() = use and
         item = getASuccessor(used, name, ns) and
         // glob imports can be shadowed
-        not declares(encl, ns, name)
+        not declares(encl, ns, name) and
+        not name = ["super", "self", "Self", "crate"]
       )
-    else item = used
-  |
-    not tree.hasRename() and
-    name = item.getName()
-    or
-    name = tree.getRename().getName().getText() and
-    name != "_"
+    else (
+      item = used and
+      (
+        not tree.hasRename() and
+        name = item.getName()
+        or
+        name = tree.getRename().getName().getText() and
+        name != "_"
+      )
+    )
   )
 }
 
@@ -961,7 +1020,7 @@
     exists(string filepath, int startline, int startcolumn, int endline, int endcolumn |
       result.getLocation().hasLocationInfo(filepath, startline, startcolumn, endline, endcolumn) and
       filepath.matches("%/main.rs") and
-      startline = 1
+      startline = [1, 3]
     )
   }
 

rust/ql/test/library-tests/path-resolution/main.rs

@@ -473,6 +473,26 @@ mod m17 {
     } // I99
 }
 
+mod m18 {
+    fn f() {
+        println!("m18::f");
+    } // I101
+
+    pub mod m19 {
+        fn f() {
+            println!("m18::m19::f");
+        } // I102
+
+        pub mod m20 {
+            pub fn g() {
+                println!("m18::m19::m20::g");
+                super::f(); // $ item=I102
+                super::super::f(); // $ item=I101
+            } // I103
+        }
+    }
+}
+
 fn main() {
     my::nested::nested1::nested2::f(); // $ item=I4
     my::f(); // $ item=I38
@@ -498,4 +518,6 @@ fn main() {
     nested6::f(); // $ item=I116
     nested8::f(); // $ item=I119
     my3::f(); // $ item=I200
+    nested_f(); // $ item=I201
+    m18::m19::m20::g(); // $ item=I103
 }

rust/ql/test/library-tests/path-resolution/my.rs

@@ -10,3 +10,9 @@ pub fn h() {
     println!("my.rs::h");
     g(); // $ item=I7
 } // I39
+
+mod my4 {
+    pub mod my5;
+}
+
+pub use my4::my5::f as nested_f; // $ item=I201

rust/ql/test/library-tests/path-resolution/my/my4/my5/mod.rs

@@ -0,0 +1,3 @@
+pub fn f() {
+    println!("my/my4/my5/mod.rs::f");
+} // I201

rust/ql/test/library-tests/path-resolution/path-resolution.expected

@@ -21,6 +21,9 @@ mod
 | main.rs:294:1:348:1 | mod m15 |
 | main.rs:350:1:442:1 | mod m16 |
 | main.rs:444:1:474:1 | mod m17 |
+| main.rs:476:1:494:1 | mod m18 |
+| main.rs:481:5:493:5 | mod m19 |
+| main.rs:486:9:492:9 | mod m20 |
 | my2/mod.rs:1:1:1:16 | mod nested2 |
 | my2/mod.rs:12:1:12:12 | mod my3 |
 | my2/nested2.rs:1:1:11:1 | mod nested3 |
@@ -30,6 +33,8 @@ mod
 | my2/nested2.rs:21:1:27:1 | mod nested7 |
 | my2/nested2.rs:22:5:26:5 | mod nested8 |
 | my.rs:1:1:1:15 | mod nested |
+| my.rs:14:1:16:1 | mod my4 |
+| my.rs:15:5:15:16 | mod my5 |
 | my/nested.rs:1:1:17:1 | mod nested1 |
 | my/nested.rs:2:5:11:5 | mod nested2 |
 resolvePath
@@ -51,7 +56,7 @@ resolvePath
 | main.rs:30:17:30:21 | super | main.rs:18:5:36:5 | mod m2 |
 | main.rs:30:17:30:24 | ...::f | main.rs:19:9:21:9 | fn f |
 | main.rs:33:17:33:17 | f | main.rs:19:9:21:9 | fn f |
-| main.rs:40:9:40:13 | super | main.rs:1:1:501:2 | SourceFile |
+| main.rs:40:9:40:13 | super | main.rs:1:1:523:2 | SourceFile |
 | main.rs:40:9:40:17 | ...::m1 | main.rs:13:1:37:1 | mod m1 |
 | main.rs:40:9:40:21 | ...::m2 | main.rs:18:5:36:5 | mod m2 |
 | main.rs:40:9:40:24 | ...::g | main.rs:23:9:27:9 | fn g |
@@ -63,7 +68,7 @@ resolvePath
 | main.rs:61:17:61:19 | Foo | main.rs:59:9:59:21 | struct Foo |
 | main.rs:64:13:64:15 | Foo | main.rs:53:5:53:17 | struct Foo |
 | main.rs:66:5:66:5 | f | main.rs:55:5:62:5 | fn f |
-| main.rs:68:5:68:8 | self | main.rs:1:1:501:2 | SourceFile |
+| main.rs:68:5:68:8 | self | main.rs:1:1:523:2 | SourceFile |
 | main.rs:68:5:68:11 | ...::i | main.rs:71:1:83:1 | fn i |
 | main.rs:74:13:74:15 | Foo | main.rs:48:1:48:13 | struct Foo |
 | main.rs:81:17:81:19 | Foo | main.rs:77:9:79:9 | struct Foo |
@@ -77,7 +82,7 @@ resolvePath
 | main.rs:87:57:87:66 | ...::g | my2/nested2.rs:7:9:9:9 | fn g |
 | main.rs:87:80:87:86 | nested4 | my2/nested2.rs:2:5:10:5 | mod nested4 |
 | main.rs:100:5:100:22 | f_defined_in_macro | main.rs:99:18:99:42 | fn f_defined_in_macro |
-| main.rs:117:13:117:17 | super | main.rs:1:1:501:2 | SourceFile |
+| main.rs:117:13:117:17 | super | main.rs:1:1:523:2 | SourceFile |
 | main.rs:117:13:117:21 | ...::m5 | main.rs:103:1:107:1 | mod m5 |
 | main.rs:118:9:118:9 | f | main.rs:104:5:106:5 | fn f |
 | main.rs:118:9:118:9 | f | main.rs:110:5:112:5 | fn f |
@@ -210,56 +215,66 @@ resolvePath
 | main.rs:465:9:465:18 | ...::f | main.rs:446:9:446:20 | fn f |
 | main.rs:470:9:470:9 | g | main.rs:459:5:466:5 | fn g |
 | main.rs:471:11:471:11 | S | main.rs:449:5:449:13 | struct S |
-| main.rs:477:5:477:6 | my | main.rs:1:1:1:7 | mod my |
-| main.rs:477:5:477:14 | ...::nested | my.rs:1:1:1:15 | mod nested |
-| main.rs:477:5:477:23 | ...::nested1 | my/nested.rs:1:1:17:1 | mod nested1 |
-| main.rs:477:5:477:32 | ...::nested2 | my/nested.rs:2:5:11:5 | mod nested2 |
-| main.rs:477:5:477:35 | ...::f | my/nested.rs:3:9:5:9 | fn f |
-| main.rs:478:5:478:6 | my | main.rs:1:1:1:7 | mod my |
-| main.rs:478:5:478:9 | ...::f | my.rs:5:1:7:1 | fn f |
-| main.rs:479:5:479:11 | nested2 | my2/mod.rs:1:1:1:16 | mod nested2 |
-| main.rs:479:5:479:20 | ...::nested3 | my2/nested2.rs:1:1:11:1 | mod nested3 |
-| main.rs:479:5:479:29 | ...::nested4 | my2/nested2.rs:2:5:10:5 | mod nested4 |
-| main.rs:479:5:479:32 | ...::f | my2/nested2.rs:3:9:5:9 | fn f |
-| main.rs:480:5:480:5 | f | my2/nested2.rs:3:9:5:9 | fn f |
-| main.rs:481:5:481:5 | g | my2/nested2.rs:7:9:9:9 | fn g |
-| main.rs:482:5:482:9 | crate | main.rs:0:0:0:0 | Crate(main@0.0.1) |
-| main.rs:482:5:482:12 | ...::h | main.rs:50:1:69:1 | fn h |
-| main.rs:483:5:483:6 | m1 | main.rs:13:1:37:1 | mod m1 |
-| main.rs:483:5:483:10 | ...::m2 | main.rs:18:5:36:5 | mod m2 |
-| main.rs:483:5:483:13 | ...::g | main.rs:23:9:27:9 | fn g |
-| main.rs:484:5:484:6 | m1 | main.rs:13:1:37:1 | mod m1 |
-| main.rs:484:5:484:10 | ...::m2 | main.rs:18:5:36:5 | mod m2 |
-| main.rs:484:5:484:14 | ...::m3 | main.rs:29:9:35:9 | mod m3 |
-| main.rs:484:5:484:17 | ...::h | main.rs:30:27:34:13 | fn h |
-| main.rs:485:5:485:6 | m4 | main.rs:39:1:46:1 | mod m4 |
-| main.rs:485:5:485:9 | ...::i | main.rs:42:5:45:5 | fn i |
-| main.rs:486:5:486:5 | h | main.rs:50:1:69:1 | fn h |
-| main.rs:487:5:487:11 | f_alias | my2/nested2.rs:3:9:5:9 | fn f |
-| main.rs:488:5:488:11 | g_alias | my2/nested2.rs:7:9:9:9 | fn g |
-| main.rs:489:5:489:5 | j | main.rs:97:1:101:1 | fn j |
-| main.rs:490:5:490:6 | m6 | main.rs:109:1:120:1 | mod m6 |
-| main.rs:490:5:490:9 | ...::g | main.rs:114:5:119:5 | fn g |
-| main.rs:491:5:491:6 | m7 | main.rs:122:1:137:1 | mod m7 |
-| main.rs:491:5:491:9 | ...::f | main.rs:129:5:136:5 | fn f |
-| main.rs:492:5:492:6 | m8 | main.rs:139:1:193:1 | mod m8 |
-| main.rs:492:5:492:9 | ...::g | main.rs:177:5:192:5 | fn g |
-| main.rs:493:5:493:6 | m9 | main.rs:195:1:203:1 | mod m9 |
-| main.rs:493:5:493:9 | ...::f | main.rs:198:5:202:5 | fn f |
-| main.rs:494:5:494:7 | m11 | main.rs:226:1:263:1 | mod m11 |
-| main.rs:494:5:494:10 | ...::f | main.rs:231:5:234:5 | fn f |
-| main.rs:495:5:495:7 | m15 | main.rs:294:1:348:1 | mod m15 |
-| main.rs:495:5:495:10 | ...::f | main.rs:335:5:347:5 | fn f |
-| main.rs:496:5:496:7 | m16 | main.rs:350:1:442:1 | mod m16 |
-| main.rs:496:5:496:10 | ...::f | main.rs:417:5:441:5 | fn f |
-| main.rs:497:5:497:7 | m17 | main.rs:444:1:474:1 | mod m17 |
-| main.rs:497:5:497:10 | ...::f | main.rs:468:5:473:5 | fn f |
-| main.rs:498:5:498:11 | nested6 | my2/nested2.rs:14:5:18:5 | mod nested6 |
-| main.rs:498:5:498:14 | ...::f | my2/nested2.rs:15:9:17:9 | fn f |
-| main.rs:499:5:499:11 | nested8 | my2/nested2.rs:22:5:26:5 | mod nested8 |
-| main.rs:499:5:499:14 | ...::f | my2/nested2.rs:23:9:25:9 | fn f |
-| main.rs:500:5:500:7 | my3 | my2/mod.rs:12:1:12:12 | mod my3 |
-| main.rs:500:5:500:10 | ...::f | my2/my3/mod.rs:1:1:5:1 | fn f |
+| main.rs:489:17:489:21 | super | main.rs:481:5:493:5 | mod m19 |
+| main.rs:489:17:489:24 | ...::f | main.rs:482:9:484:9 | fn f |
+| main.rs:490:17:490:21 | super | main.rs:481:5:493:5 | mod m19 |
+| main.rs:490:17:490:28 | ...::super | main.rs:476:1:494:1 | mod m18 |
+| main.rs:490:17:490:31 | ...::f | main.rs:477:5:479:5 | fn f |
+| main.rs:497:5:497:6 | my | main.rs:1:1:1:7 | mod my |
+| main.rs:497:5:497:14 | ...::nested | my.rs:1:1:1:15 | mod nested |
+| main.rs:497:5:497:23 | ...::nested1 | my/nested.rs:1:1:17:1 | mod nested1 |
+| main.rs:497:5:497:32 | ...::nested2 | my/nested.rs:2:5:11:5 | mod nested2 |
+| main.rs:497:5:497:35 | ...::f | my/nested.rs:3:9:5:9 | fn f |
+| main.rs:498:5:498:6 | my | main.rs:1:1:1:7 | mod my |
+| main.rs:498:5:498:9 | ...::f | my.rs:5:1:7:1 | fn f |
+| main.rs:499:5:499:11 | nested2 | my2/mod.rs:1:1:1:16 | mod nested2 |
+| main.rs:499:5:499:20 | ...::nested3 | my2/nested2.rs:1:1:11:1 | mod nested3 |
+| main.rs:499:5:499:29 | ...::nested4 | my2/nested2.rs:2:5:10:5 | mod nested4 |
+| main.rs:499:5:499:32 | ...::f | my2/nested2.rs:3:9:5:9 | fn f |
+| main.rs:500:5:500:5 | f | my2/nested2.rs:3:9:5:9 | fn f |
+| main.rs:501:5:501:5 | g | my2/nested2.rs:7:9:9:9 | fn g |
+| main.rs:502:5:502:9 | crate | main.rs:0:0:0:0 | Crate(main@0.0.1) |
+| main.rs:502:5:502:12 | ...::h | main.rs:50:1:69:1 | fn h |
+| main.rs:503:5:503:6 | m1 | main.rs:13:1:37:1 | mod m1 |
+| main.rs:503:5:503:10 | ...::m2 | main.rs:18:5:36:5 | mod m2 |
+| main.rs:503:5:503:13 | ...::g | main.rs:23:9:27:9 | fn g |
+| main.rs:504:5:504:6 | m1 | main.rs:13:1:37:1 | mod m1 |
+| main.rs:504:5:504:10 | ...::m2 | main.rs:18:5:36:5 | mod m2 |
+| main.rs:504:5:504:14 | ...::m3 | main.rs:29:9:35:9 | mod m3 |
+| main.rs:504:5:504:17 | ...::h | main.rs:30:27:34:13 | fn h |
+| main.rs:505:5:505:6 | m4 | main.rs:39:1:46:1 | mod m4 |
+| main.rs:505:5:505:9 | ...::i | main.rs:42:5:45:5 | fn i |
+| main.rs:506:5:506:5 | h | main.rs:50:1:69:1 | fn h |
+| main.rs:507:5:507:11 | f_alias | my2/nested2.rs:3:9:5:9 | fn f |
+| main.rs:508:5:508:11 | g_alias | my2/nested2.rs:7:9:9:9 | fn g |
+| main.rs:509:5:509:5 | j | main.rs:97:1:101:1 | fn j |
+| main.rs:510:5:510:6 | m6 | main.rs:109:1:120:1 | mod m6 |
+| main.rs:510:5:510:9 | ...::g | main.rs:114:5:119:5 | fn g |
+| main.rs:511:5:511:6 | m7 | main.rs:122:1:137:1 | mod m7 |
+| main.rs:511:5:511:9 | ...::f | main.rs:129:5:136:5 | fn f |
+| main.rs:512:5:512:6 | m8 | main.rs:139:1:193:1 | mod m8 |
+| main.rs:512:5:512:9 | ...::g | main.rs:177:5:192:5 | fn g |
+| main.rs:513:5:513:6 | m9 | main.rs:195:1:203:1 | mod m9 |
+| main.rs:513:5:513:9 | ...::f | main.rs:198:5:202:5 | fn f |
+| main.rs:514:5:514:7 | m11 | main.rs:226:1:263:1 | mod m11 |
+| main.rs:514:5:514:10 | ...::f | main.rs:231:5:234:5 | fn f |
+| main.rs:515:5:515:7 | m15 | main.rs:294:1:348:1 | mod m15 |
+| main.rs:515:5:515:10 | ...::f | main.rs:335:5:347:5 | fn f |
+| main.rs:516:5:516:7 | m16 | main.rs:350:1:442:1 | mod m16 |
+| main.rs:516:5:516:10 | ...::f | main.rs:417:5:441:5 | fn f |
+| main.rs:517:5:517:7 | m17 | main.rs:444:1:474:1 | mod m17 |
+| main.rs:517:5:517:10 | ...::f | main.rs:468:5:473:5 | fn f |
+| main.rs:518:5:518:11 | nested6 | my2/nested2.rs:14:5:18:5 | mod nested6 |
+| main.rs:518:5:518:14 | ...::f | my2/nested2.rs:15:9:17:9 | fn f |
+| main.rs:519:5:519:11 | nested8 | my2/nested2.rs:22:5:26:5 | mod nested8 |
+| main.rs:519:5:519:14 | ...::f | my2/nested2.rs:23:9:25:9 | fn f |
+| main.rs:520:5:520:7 | my3 | my2/mod.rs:12:1:12:12 | mod my3 |
+| main.rs:520:5:520:10 | ...::f | my2/my3/mod.rs:1:1:5:1 | fn f |
+| main.rs:521:5:521:12 | nested_f | my/my4/my5/mod.rs:1:1:3:1 | fn f |
+| main.rs:522:5:522:7 | m18 | main.rs:476:1:494:1 | mod m18 |
+| main.rs:522:5:522:12 | ...::m19 | main.rs:481:5:493:5 | mod m19 |
+| main.rs:522:5:522:17 | ...::m20 | main.rs:486:9:492:9 | mod m20 |
+| main.rs:522:5:522:20 | ...::g | main.rs:487:13:491:13 | fn g |
 | my2/mod.rs:5:5:5:11 | nested2 | my2/mod.rs:1:1:1:16 | mod nested2 |
 | my2/mod.rs:5:5:5:20 | ...::nested3 | my2/nested2.rs:1:1:11:1 | mod nested3 |
 | my2/mod.rs:5:5:5:29 | ...::nested4 | my2/nested2.rs:2:5:10:5 | mod nested4 |
@@ -273,13 +288,16 @@ resolvePath
 | my2/my3/mod.rs:3:5:3:5 | g | my2/mod.rs:3:1:6:1 | fn g |
 | my2/my3/mod.rs:4:5:4:5 | h | main.rs:50:1:69:1 | fn h |
 | my2/my3/mod.rs:7:5:7:9 | super | my2/mod.rs:1:1:12:13 | SourceFile |
-| my2/my3/mod.rs:7:5:7:16 | ...::super | main.rs:1:1:501:2 | SourceFile |
+| my2/my3/mod.rs:7:5:7:16 | ...::super | main.rs:1:1:523:2 | SourceFile |
 | my2/my3/mod.rs:7:5:7:19 | ...::h | main.rs:50:1:69:1 | fn h |
 | my2/my3/mod.rs:8:5:8:9 | super | my2/mod.rs:1:1:12:13 | SourceFile |
 | my2/my3/mod.rs:8:5:8:12 | ...::g | my2/mod.rs:3:1:6:1 | fn g |
 | my.rs:3:5:3:10 | nested | my.rs:1:1:1:15 | mod nested |
 | my.rs:3:5:3:13 | ...::g | my/nested.rs:19:1:22:1 | fn g |
 | my.rs:11:5:11:5 | g | my/nested.rs:19:1:22:1 | fn g |
+| my.rs:18:9:18:11 | my4 | my.rs:14:1:16:1 | mod my4 |
+| my.rs:18:9:18:16 | ...::my5 | my.rs:15:5:15:16 | mod my5 |
+| my.rs:18:9:18:19 | ...::f | my/my4/my5/mod.rs:1:1:3:1 | fn f |
 | my/nested.rs:9:13:9:13 | f | my/nested.rs:3:9:5:9 | fn f |
 | my/nested.rs:15:9:15:15 | nested2 | my/nested.rs:2:5:11:5 | mod nested2 |
 | my/nested.rs:15:9:15:18 | ...::f | my/nested.rs:3:9:5:9 | fn f |