Style fixes

PiperOrigin-RevId: 503956186
diff --git a/nullability_verification/pointer_nullability.cc b/nullability_verification/pointer_nullability.cc
index b407d21..4686a1f 100644
--- a/nullability_verification/pointer_nullability.cc
+++ b/nullability_verification/pointer_nullability.cc
@@ -206,29 +206,31 @@
 }
 
 std::vector<NullabilityKind> getNullabilityAnnotationsFromType(
-    QualType T, llvm::function_ref<TypeParamNullability> SubstNullability) {
+    QualType T,
+    llvm::function_ref<GetTypeParamNullability> SubstituteTypeParam) {
   struct Walker : NullabilityWalker<Walker> {
     std::vector<NullabilityKind> Annotations;
-    llvm::function_ref<TypeParamNullability> SubstNullability;
+    llvm::function_ref<GetTypeParamNullability> SubstituteTypeParam;
 
     void report(const PointerType*, NullabilityKind NK) {
       Annotations.push_back(NK);
     }
 
     void VisitSubstTemplateTypeParmType(const SubstTemplateTypeParmType* ST) {
-      if (SubstNullability)
-        if (auto Subst = SubstNullability(ST)) {
+      if (SubstituteTypeParam) {
+        if (auto Subst = SubstituteTypeParam(ST)) {
           DCHECK_EQ(Subst->size(),
                     countPointersInType(ST->getCanonicalTypeInternal()))
               << "Substituted nullability has the wrong structure: "
               << QualType(ST, 0).getAsString();
-          Annotations.insert(Annotations.end(), Subst->begin(), Subst->end());
+          llvm::append_range(Annotations, *Subst);
           return;
         }
+      }
       Visit(ST->desugar());
     }
   } AnnotationVisitor;
-  AnnotationVisitor.SubstNullability = SubstNullability;
+  AnnotationVisitor.SubstituteTypeParam = SubstituteTypeParam;
   AnnotationVisitor.Visit(T);
   return std::move(AnnotationVisitor.Annotations);
 }
diff --git a/nullability_verification/pointer_nullability.h b/nullability_verification/pointer_nullability.h
index 94483aa..a514c87 100644
--- a/nullability_verification/pointer_nullability.h
+++ b/nullability_verification/pointer_nullability.h
@@ -95,7 +95,7 @@
 
 /// A function that may provide enhanced nullability information for a
 /// substituted template parameter (which has no sugar of its own).
-using TypeParamNullability = std::optional<std::vector<NullabilityKind>>(
+using GetTypeParamNullability = std::optional<std::vector<NullabilityKind>>(
     const SubstTemplateTypeParmType* ST);
 /// Traverse over a type to get its nullability. For example, if T is the type
 /// Struct3Arg<int * _Nonnull, int, pair<int * _Nullable, int *>> * _Nonnull,
@@ -104,7 +104,7 @@
 /// argument of Struct3Arg) do not get a nullability annotation.
 std::vector<NullabilityKind> getNullabilityAnnotationsFromType(
     QualType T,
-    llvm::function_ref<TypeParamNullability> SubstNullability = nullptr);
+    llvm::function_ref<GetTypeParamNullability> SubstituteTypeParam = nullptr);
 
 /// Computes the number of pointer slots within a type.
 /// Each of these could conceptually be nullable, so this is the length of