slint/sixtyfps_compiler/tests/syntax/basic/property_declaration.60

Test := Rectangle {
    property<int> foo;
    foo: 100;
    property<NonExistent> bar;
//           ^error{Unknown property type 'NonExistent'}
    property<float> foo;
//                  ^error{Cannot override property 'foo'}
    property<string> text: "property with binding initializer";
    property<int> x;
//                ^error{Cannot override property 'x'}

    property<string> colspan;
//                   ^error{Cannot override property 'colspan'}
}