Function slint_interpreter_struct_iterator_next 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn slint_interpreter_struct_iterator_next<'a>(
    iter: &'a mut StructIteratorOpaque<'_>,
    k: &mut Slice<'a, u8>,
) -> *mut Value

Available on crate feature ffi only.

Advance the iterator and return the next value, or a null pointer