[BUG] @Helper fails if it is directly inside a method's body

[igfoo]

Describe the bug

It looks like when HandleHelper.handle calls annotatedType.directUp(), if the class is nested immediately within a method then the result is the method. As this is not a block or a case statement, getStatementsFromJcNode returns null, and the handler fails with an error.

To Reproduce

With L1.java (the example in the docs):

import lombok.experimental.Helper;

public class L1 {
  int someMethod(int arg1) {
    int localVar = 5;

    @Helper class Helpers {
      int helperMethod(int arg) {
        return arg + localVar;
      }
    }

    return helperMethod(10);
  }
}

I get

$ javac -cp lombok-1.18.26.jar L1.java
L1.java:7: error: @Helper is legal only on method-local classes.
    @Helper class Helpers {
    ^
1 error
$

If I add an extra block around the body:

import lombok.experimental.Helper;

public class L2 {
  int someMethod(int arg1) {
   {
    int localVar = 5;

    @Helper class Helpers {
      int helperMethod(int arg) {
        return arg + localVar;
      }
    }

    return helperMethod(10);
   }
  }
}

then it works:

$ javac -cp lombok-1.18.26.jar L2.java
$

Expected behavior

I expected the example to compile.

Version info (please complete the following information):

• Lombok version: 1.18.26
• Platform: javac 17.0.6