another fix

nullaway/src/main/java/com/uber/nullaway/NullAway.java

@@ -441,6 +441,15 @@ public Description matchNewClass(NewClassTree tree, VisitorState state) {
     if (methodSymbol == null) {
       throw new RuntimeException("not expecting unresolved method here");
     }
+    ExpressionTree enclosingExpression = tree.getEnclosingExpression();
+    if (enclosingExpression != null) {
+      // technically this is not a dereference; there is a requireNonull() call in the
+      // bytecode.  but it's close enough for error reporting
+      Description desc = matchDereference(enclosingExpression, tree, state);
+      if (!desc.equals(Description.NO_MATCH)) {
+        state.reportMatch(desc);
+      }
+    }
     List<? extends ExpressionTree> actualParams = tree.getArguments();
     if (tree.getClassBody() != null) {
       // invoking constructor of anonymous class

nullaway/src/test/java/com/uber/nullaway/CoreTests.java

@@ -1141,9 +1141,14 @@ public void issue1888() {
         .addSourceLines(
             "Outer.java",
             "package com.uber;",
+            "import org.jspecify.annotations.Nullable;",
             "class Outer {",
             "    class Inner {}",
-            "    static Inner f(Outer outer) {",
+            "    static Inner testNegative(Outer outer) {",
+            "        return outer.new Inner() {};",
+            "    }",
+            "    static Inner testPositive(@Nullable Outer outer) {",
+            "        // BUG: Diagnostic contains: dereferenced expression outer is @Nullable",
             "        return outer.new Inner() {};",
             "    }",
             "}")