Rust: Extend Self resolution logic to all item kinds

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

@@ -1896,10 +1896,11 @@ private predicate isImplSelfQualifiedPath(
   name = path.getText()
 }
 
-private TypeAliasItemNode resolveSelfAssocType(PathExt qualifier, PathExt path) {
+private ItemNode resolveImplSelfQualified(PathExt qualifier, PathExt path, Namespace ns) {
   exists(ImplItemNode impl, string name |
     isImplSelfQualifiedPath(impl, qualifier, path, name) and
-    result = impl.getAssocItem(name)
+    result = impl.getAssocItem(name) and
+    ns = result.getNamespace()
   )
 }
 
@@ -1909,17 +1910,12 @@ private TypeAliasItemNode resolveSelfAssocType(PathExt qualifier, PathExt path)
  */
 pragma[nomagic]
 private ItemNode resolvePathCandQualified(PathExt qualifier, ItemNode q, PathExt path, Namespace ns) {
-  // Special case for `Self::AssocType`; this always refers to the associated
-  // type in the enclosing `impl` block, if available.
+  // Special case for `Self::Assoc`; this always refers to the associated
+  // item in the enclosing `impl` block, if available.
   q = resolvePathCandQualifier(qualifier, path, _) and
-  ns.isType() and
-  result = resolveSelfAssocType(qualifier, path)
+  result = resolveImplSelfQualified(qualifier, path, ns)
   or
-  (
-    not exists(resolveSelfAssocType(qualifier, path))
-    or
-    not ns.isType()
-  ) and
+  not exists(resolveImplSelfQualified(qualifier, path, ns)) and
   exists(string name, SuccessorKind kind, UseOption useOpt |
     q = resolvePathCandQualifier(qualifier, path, name) and
     result = getASuccessor(q, name, ns, kind, useOpt) and

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

@@ -4,5 +4,3 @@ multipleCallTargets
 | main.rs:369:9:371:16 | ...::f(...) |
 | main.rs:450:9:454:16 | ...::f(...) |
 | main.rs:455:9:459:16 | ...::f(...) |
-| main.rs:534:13:534:25 | ...::Assoc(...) |
-| main.rs:545:14:545:26 | ...::Assoc(...) |

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

@@ -531,7 +531,7 @@ mod m16 {
 
         fn Assoc()
             -> Self::Assoc { // $ item=S3i32AssocType
-            Self::Assoc() + 1 // $ item=S3i32AssocFunc $ SPURIOUS: item=S3boolAssocFunc
+            Self::Assoc() + 1 // $ item=S3i32AssocFunc
         } // S3i32AssocFunc
     }
 
@@ -542,7 +542,7 @@ mod m16 {
 
         fn Assoc()
             -> Self::Assoc { // $ item=S3boolAssocType
-            !Self::Assoc() // $ item=S3boolAssocFunc $ SPURIOUS: item=S3i32AssocFunc
+            !Self::Assoc() // $ item=S3boolAssocFunc
         } // S3boolAssocFunc
     }
 }

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

@@ -296,7 +296,6 @@ resolvePath
 | main.rs:533:16:533:26 | ...::Assoc | main.rs:528:31:530:9 | type Assoc |
 | main.rs:534:13:534:16 | Self | main.rs:525:5:525:22 | struct S3 |
 | main.rs:534:13:534:23 | ...::Assoc | main.rs:532:9:535:9 | fn Assoc |
-| main.rs:534:13:534:23 | ...::Assoc | main.rs:543:9:546:9 | fn Assoc |
 | main.rs:539:10:539:15 | Trait5 | main.rs:508:5:512:5 | trait Trait5 |
 | main.rs:539:21:539:28 | S3::<...> | main.rs:525:5:525:22 | struct S3 |
 | main.rs:539:24:539:27 | bool | {EXTERNAL LOCATION} | struct bool |
@@ -304,7 +303,6 @@ resolvePath
 | main.rs:544:16:544:19 | Self | main.rs:525:5:525:22 | struct S3 |
 | main.rs:544:16:544:26 | ...::Assoc | main.rs:539:32:541:9 | type Assoc |
 | main.rs:545:14:545:17 | Self | main.rs:525:5:525:22 | struct S3 |
-| main.rs:545:14:545:24 | ...::Assoc | main.rs:532:9:535:9 | fn Assoc |
 | main.rs:545:14:545:24 | ...::Assoc | main.rs:543:9:546:9 | fn Assoc |
 | main.rs:562:14:562:16 | Foo | main.rs:552:9:554:9 | trait Foo |
 | main.rs:562:22:562:22 | X | main.rs:560:9:560:21 | struct X |