Recognize `@ParametricNullness` in `NullPointerTester`.

In short: Take a method parameter whose type is a type-variable usage `T`. `NullPointerTester` assumed that the method should throw an exception when passed `null` unless the parameter type is annotated `@Nullable T`. But for a type like `Predicate<T>`, we don't want a `Predicate<@Nullable String>` to throw an exception if passed `null`. The only case in which a class should _definitely_ throw for such a parameter is if it doesn't permit nullable type arguments at all (like `ImmutableList`). Yet, in our new world, we don't want to annotate the argument of `Predicate.apply` as `@Nullable`.

The annotation `@ParametricNullness` is our new way of distinguishing `Predicate` (where we'll use it) from `ImmutableList` (where we won't).

Eventually, we will remove the annotation, at which point we'll either update `NullPointerTester` to distinguish `Predicate` from `ImmutableList` based on their type parameters' bounds or else we'll disable `NullPointerTester` at least temporarily.

RELNOTES=n/a
PiperOrigin-RevId: 366867268

1 files changed, 2 insertions, 1 deletions

diff --git a/android/guava-testlib/src/com/google/common/testing/NullPointerTester.java b/android/guava-testlib/src/com/google/common/testing/NullPointerTester.java
index a32a53b7b..1099854d1 100644
--- a/android/guava-testlib/src/com/google/common/testing/NullPointerTester.java
+++ b/android/guava-testlib/src/com/google/common/testing/NullPointerTester.java
@@ -474,7 +474,8 @@ public final class NullPointerTester {
   }
 
   private static final ImmutableSet<String> NULLABLE_ANNOTATION_SIMPLE_NAMES =
-      ImmutableSet.of("CheckForNull", "Nullable", "NullableDecl", "NullableType");
+      ImmutableSet.of(
+          "CheckForNull", "Nullable", "NullableDecl", "NullableType", "ParametricNullness");
 
   static boolean isNullable(AnnotatedElement e) {
     for (Annotation annotation : e.getAnnotations()) {