Function struct_partial_cmp 

pub fn struct_partial_cmp(
    a: &(dyn Struct + 'static),
    b: &(dyn PartialReflect + 'static),
) -> Option<Ordering>

Lexicographically compares two Struct values and returns their ordering.

Returns None if the comparison couldn’t be performed (e.g., kinds mismatch or an element comparison returns None).