Rust: Apply suggestions from code review

Co-authored-by: Tom Hvitved <hvitved@github.com>

rust/ql/lib/codeql/rust/internal/typeinference/AssociatedTypes.qll

@@ -21,7 +21,7 @@ final class AssocType extends TypeAlias {
 
 /** Gets an associated type of `trait` or of a supertrait of `trait`. */
 AssocType getTraitAssocType(Trait trait) {
-  result = trait.getSupertrait*().getAssocItemList().getAnAssocItem()
+  result.getTrait() = trait.getSupertrait*()
 }
 
 /** Holds if `path` is of the form `<type as trait>::name` */
@@ -44,7 +44,7 @@ predicate tpAssociatedType(TypeParam tp, AssocType assoc, Path path) {
   resolvePath(path.getQualifier()) = tp and
   resolvePath(path) = assoc
   or
-  exists(TypeRepr typeRepr, Path traitPath, string name |
+  exists(PathTypeRepr typeRepr, Path traitPath, string name |
     asTraitPath(path, typeRepr, traitPath, name) and
     tp = resolvePath(typeRepr.(PathTypeRepr).getPath()) and
     assoc = resolvePath(traitPath).(TraitItemNode).getAssocItem(name)

rust/ql/lib/codeql/rust/internal/typeinference/Type.qll

@@ -496,7 +496,7 @@ class TypeParamAssociatedTypeTypeParameter extends TypeParameter,
   AssocType getTypeAlias() { result = assoc }
 
   /** Gets a path that accesses this type parameter. */
-  Path getPath() { tpAssociatedType(typeParam, assoc, result) }
+  Path getAPath() { tpAssociatedType(typeParam, assoc, result) }
 
   override ItemNode getDeclaringItem() { result.getTypeParam(_) = typeParam }
 

rust/ql/lib/codeql/rust/internal/typeinference/TypeMention.qll

@@ -322,7 +322,7 @@ private module MkTypeMention<getAdditionalPathTypeAtSig/2 getAdditionalPathTypeA
       )
       or
       // If this path is a type parameter bound, then any associated types
-      // accessed on the type parameter, that originate from this bound, should
+      // accessed on the type parameter, which originate from this bound, should
       // be instantiated into the bound, as explained in the comment for
       // `TypeParamAssociatedTypeTypeParameter`.
       // ```rust