Rollup merge of #29213 - apasel422:unsafe-cell, r=Gankro
Rollup merge of #29213 - apasel422:unsafe-cell, r=Gankro

r? @alexcrichton 

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