How to escape colon in the '&' macro in strformat ?

[stbalbach]

This works:
    
    
    import strformat
    echo &"""{"url = http//example.com"}"""
    
    
    Run

This does not: 
    
    
    import strformat
    echo &"""{"url = http://example.com"}""";
    
    
    Run

Colon is the problem.