From 2bd7859957ebf205f1c73f9d38d9f85338b80773 Mon Sep 17 00:00:00 2001
From: Liam Miller-Cushon <cushon@google.com>
Date: Wed, 3 Jan 2024 08:54:36 -0800
Subject: [PATCH] Add an assertion to try to help debug
 https://github.com/google/error-prone/issues/4225

PiperOrigin-RevId: 595414757
---
 .../google/errorprone/bugpatterns/nullness/NullnessUtils.java   | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/core/src/main/java/com/google/errorprone/bugpatterns/nullness/NullnessUtils.java b/core/src/main/java/com/google/errorprone/bugpatterns/nullness/NullnessUtils.java
index e1dbc7e815f..c65fbaaa626 100644
--- a/core/src/main/java/com/google/errorprone/bugpatterns/nullness/NullnessUtils.java
+++ b/core/src/main/java/com/google/errorprone/bugpatterns/nullness/NullnessUtils.java
@@ -38,6 +38,7 @@
 import static com.sun.source.tree.Tree.Kind.PARAMETERIZED_TYPE;
 import static com.sun.tools.javac.parser.Tokens.TokenKind.DOT;
 import static java.lang.Boolean.TRUE;
+import static java.util.Objects.requireNonNull;
 
 import com.google.auto.value.AutoValue;
 import com.google.common.collect.ImmutableSet;
@@ -260,6 +261,7 @@ static boolean hasExtraParameterForEnclosingInstance(MethodSymbol symbol) {
       return false;
     }
     ClassSymbol constructedClass = enclosingClass(symbol);
+    requireNonNull(constructedClass, symbol::toString);
     return enclosingClass(constructedClass) != null && !constructedClass.isStatic();
   }