,---------------.
,------------.  |MyStruct3      |
|MyInterface |  |---------------|
|------------|  |- foo()        |
|- foo() bool|  |               |
|            |  |+ Foo MyStruct1|
`------------'  |               |
                `---------------'
                                 
                                 
         ,------------.          
         |MyStruct1   |          
         |------------|          
         |- foo() bool|          
         |            |          
         `------------'          
                |                
          ,---------.            
          |MyStruct2|            
          |---------|            
          `---------'