Rollup merge of #33277 - birkenfeld:fmt-named-dollar-args, r=steveklabnik
Rollup merge of #33277 - birkenfeld:fmt-named-dollar-args, r=steveklabnik

Fix std::fmt format spec: named args are allowed with "$" syntax

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