More generic function type cases working

pkg/analyzer/lib/src/dart/element/builder.dart

Index: pkg/analyzer/lib/src/dart/element/builder.dart
diff --git a/pkg/analyzer/lib/src/dart/element/builder.dart b/pkg/analyzer/lib/src/dart/element/builder.dart
index 6821bcfa044130383f6cfdad2b6c11c1791a333b..f90698a8b044d1eec932c459c47a119e19e10524 100644
--- a/pkg/analyzer/lib/src/dart/element/builder.dart
+++ b/pkg/analyzer/lib/src/dart/element/builder.dart
@@ -456,7 +456,7 @@ class ApiElementBuilder extends _BaseElementBuilder {
     element.typeParameters = typeParameters;
     _createTypeParameterTypes(typeParameters);
     element.type = new FunctionTypeImpl.forTypedef(element);
-    element.function = node.functionType.type.element;
+    element.function = node.functionType?.type?.element;
     _currentHolder.addTypeAlias(element);
     aliasName.staticElement = element;
     holder.validate();
@@ -1446,7 +1446,7 @@ abstract class _BaseElementBuilder extends RecursiveAstVisitor<Object> {
     if (normalParameter is SimpleFormalParameterImpl) {
       normalParameter.element = parameter;
     }
-    parameterName.staticElement = parameter;
+    parameterName?.staticElement = parameter;
     normalParameter.accept(this);
     return null;
   }