IoSlice/IoSliceMut should be Send and Sync
IoSlice/IoSliceMut should be Send and Sync

graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust