Issue 28027. Move Null to the bottom in the Analyzer.

pkg/analyzer/lib/src/task/dart.dart

Index: pkg/analyzer/lib/src/task/dart.dart
diff --git a/pkg/analyzer/lib/src/task/dart.dart b/pkg/analyzer/lib/src/task/dart.dart
index d842d2fde49d3a9e798f6b7b7394a251398e7ebf..05528d7f03960538894c15a1bc7dd2c17eab31bf 100644
--- a/pkg/analyzer/lib/src/task/dart.dart
+++ b/pkg/analyzer/lib/src/task/dart.dart
@@ -3745,7 +3745,7 @@ class InferStaticVariableTypeTask extends InferStaticVariableTask {
       // Record the type of the variable.
       //
       DartType newType = initializer.staticType;
-      if (newType == null || newType.isBottom) {
+      if (newType == null || newType.isBottom || newType.isDartCoreNull) {
         newType = typeProvider.dynamicType;
       }
       setFieldType(variable, newType);