Auto merge of #28028 - tshepang:add-size_hint-example, r=alexcrichton
Auto merge of #28028 - tshepang:add-size_hint-example, r=alexcrichton


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