Rollup merge of #37527 - Mark-Simulacrum:mpsc-recvtimeouterror-error-impl, r=alexcrichton
Rollup merge of #37527 - Mark-Simulacrum:mpsc-recvtimeouterror-error-impl, r=alexcrichton

Add Error implementation for std::sync::mpsc::RecvTimeoutError.

Fixes https://github.com/rust-lang/rust/issues/37525.

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