@Test
public void testBlock1() throws Exception {

  final String program = "int x; void main() { { x = 2; } }";
  final TranslationUnit tu = ParseHelper.parse(program);
  List<UnwrapReductionOpportunity> ops = UnwrapReductionOpportunities
      .findOpportunities(MakeShaderJobFromFragmentShader.make(tu),
        new ReducerContext(false,
      ShadingLanguageVersion.GLSL_440, new SameValueRandom(false, 0), new IdGenerator()));
  assertEquals(1, ops.size());
}