error[E0277]: the trait bound `NoToSocketAddrs: ToSocketAddrs` is not satisfied --> $DIR/issue-39029.rs:16:38 | LL | let _errors = TcpListener::bind(&bad); | ----------------- ^^^ the trait `ToSocketAddrs` is not implemented for `NoToSocketAddrs` | | | required by a bound introduced by this call | = note: required for `&NoToSocketAddrs` to implement `ToSocketAddrs` note: required by a bound in `TcpListener::bind` --> $SRC_DIR/std/src/net/tcp.rs:LL:COL help: consider dereferencing here | LL | let _errors = TcpListener::bind(&*bad); | + error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.