prove model for own_ptr
I swapped around the modalities in ty_shr
as I mentioned earlier in mattermost and commented out the remaining parts of the module which deal with subtyping and typing contexts (which we have not ported yet).
I swapped around the modalities in ty_shr
as I mentioned earlier in mattermost and commented out the remaining parts of the module which deal with subtyping and typing contexts (which we have not ported yet).