static Builder builder() {
      return new AutoValue_AutoValueNotEclipseTest_ConcreteOptional.Builder();
    }
Like {@link AutoValueTest}, but with code that doesn't build with at least some versions of
Eclipse, and should therefore not be included in {@link CompileWithEclipseTest}. (The latter is
not currently present in the open-source build.)
value/src/it/functional/src/test/java/com/google/auto/value/AutoValueNotEclipseTest.java