How to use Google Blogger Lambda Operators

Google Blogger has implemented a new set of Lambda expression operators for 
its template language. See: 
https://blogger.googleblog.com/2016/05/more-custom-template-flexibility.html
 and https://productforums.google.com/forum/#!topic/blogger/l3phi8bscGY .

The example code given (the b:if/ amended) is:

<!-- Show a Flower image if the post has the label flower -->
<b:if cond='data:post.labels any (l => l.name == "Flower")'>
  <img src=’/img/flower.jpg’ />
</b:if>

I can't figure out how to get this to work in a template. Would someone 
please provide some working code I could drop in to a template and see it 
working.


Here is my code (A):

================
 <b:section class='main' id='blog-posts' name='Main' showaddelement='no'>
            <b:widget id='HTML10' locked='false' title='Test1234' 
type='HTML' version='1'>
              <b:widget-settings>
                <b:widget-setting name='content'>hello</b:widget-setting>
              </b:widget-settings>
              <b:includable id='main'>
 

* <b:if cond='data:post.labels any (l => l.name <http://l.name/> == 
"Flower")'> *
*  Hi!*
*</b:if>*
            
  <!-- only display title if it's non-empty -->
  <b:if cond='data:title != &quot;&quot;'>
    <h2 class='title'><data:title/></h2>
  </b:if>
  <div class='widget-content'>
    <data:content/>
  </div>

  <b:include name='quickedit'/>     
</b:includable>
            </b:widget>



=============

Actually I wish the widget shows according my post label , flower widget 
show when it's a flower post, computer widget show when it's a  
computer  post, I've this thought:


================
 <b:section class='main' id='blog-posts' name='Main' showaddelement='no'>
            <b:widget id='HTML10' locked='false' title='Test1234' 
type='HTML' version='1'>
              <b:widget-settings>
                <b:widget-setting name='content'>hello</b:widget-setting>
              </b:widget-settings>
              <b:includable id='main'>
 

* <b:if cond='data:post.labels any (l => l.name <http://l.name/> == 
"Flower")'> *


            
  <!-- only display title if it's non-empty -->
  <b:if cond='data:title != &quot;&quot;'>
    <h2 class='title'><data:title/></h2>
  </b:if>
  <div class='widget-content'>
    <data:content/>
  </div>

  <b:include name='quickedit'/>   *</b:if>*  
</b:includable>
            </b:widget>


========


Regrettable,  even if I use my first code (A), still not working. I wonder 
this method really works or what setting wrong I've made that cause this. I 
tired other blogger template but have a same result.

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