.  // Content let inc_btn = Button:: new_with_label( "Increment" ) ; inc_btnnew_with_label( . connect_clicked( move | _ | { inc_btnconnect_clicked( . set_label( "Incremented" ) ; labelset_label( } ) ; let dec_btn = Button:: new_with_label( "Decrement" ) ; dec_btnnew_with_label( . connect_clicked( move | _ | { dec_btnconnect_clicked( . set_label( "Decremented" ) ; labelset_label( } ) ;  