introduce constant: don't traverse inside class or lambda to check unhandled throwables; check for calls to instance methods though

java/java-tests/testData/refactoring/introduceConstant/AnonymousClassWithThrownClause.java

@@ -0,0 +1,17 @@
+import java.io.IOException;
+class Test {
+  void bar() throws IOException {}
+
+  I get() {
+    return <selection>new I() {
+      @Override
+      public void foo() throws IOException {
+        bar();
+      }
+    }</selection>;
+  }
+}
+
+interface I {
+  void foo() throws IOException;
+}