Improve error message for missing #[sp(var_size)] : attempt to compute <...> wich would overflow #3
Description
Currently, simple_parse ensures that it does not mistake static/dynamic sizes that it does not know about through the static_assertions crate. Unfortunately when a const assert fails, you get an ugly error message that is confusing at best :
attempt to compute `0_usize - 1_usize`, which would overflow
This error can be fixed by annotating your dynamic fields with #[sp(var_size)]
It would be nice to have an error that says :
- Where the annotation is needed (which field of which struct/enum)
- What needs to be added (the sp attribute above)
This might not be currently possible because of rust-lang/rust#51999