I was referring to all usage of Rust by clients across the world versus a single compiler and reference standard library. Many of these clients will need &quot;unsafe&quot; blocks, and the combined length of these &quot;unsafe&quot; blocks will exceed that of the standard library and compiler assuming Rust adoption is high.<p>This is what concerns me: I wished Rust&#x27;s &quot;unsafe&quot; blocks could have been exclusively confined to some things in the reference language compiler and standard library. Unfortunately, it seems like many reasonable systems applications still need access to unsafe blocks for reasons of performance, low level access, etc and such needs are not uncommon given the target systems audience.