Rollup merge of #54891 - rust-lang:SimonSapin-patch-1, r=nagisa
Rollup merge of #54891 - rust-lang:SimonSapin-patch-1, r=nagisa

Fix tracking issue for Once::is_completed

https:ac22bd2e4f7fea10e20cc9baf83b6add2aa5292c@matklad

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