[INFO] cloning repository https://github.com/AbsoluteVirtueXI/echo-rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/AbsoluteVirtueXI/echo-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAbsoluteVirtueXI%2Fecho-rust"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAbsoluteVirtueXI%2Fecho-rust'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2338b92ae4fcae0abed6389f611aba332f38d41b
[INFO] checking AbsoluteVirtueXI/echo-rust against try#96b3c169cd2d8959926fa240f10342f1659f8ae3 for pr-71896
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAbsoluteVirtueXI%2Fecho-rust" "/workspace/builds/worker-0/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/AbsoluteVirtueXI/echo-rust on toolchain 96b3c169cd2d8959926fa240f10342f1659f8ae3
[INFO] running `"/workspace/cargo-home/bin/cargo" "+96b3c169cd2d8959926fa240f10342f1659f8ae3" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/AbsoluteVirtueXI/echo-rust
[INFO] finished tweaking git repo https://github.com/AbsoluteVirtueXI/echo-rust
[INFO] tweaked toml for git repo https://github.com/AbsoluteVirtueXI/echo-rust written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/AbsoluteVirtueXI/echo-rust already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+96b3c169cd2d8959926fa240f10342f1659f8ae3" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+96b3c169cd2d8959926fa240f10342f1659f8ae3" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 310bf4fba19478dde090c83dc71da3c2689be45a2effc7efb9e9f351e807d4d1
[INFO] running `"docker" "start" "-a" "310bf4fba19478dde090c83dc71da3c2689be45a2effc7efb9e9f351e807d4d1"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking futures-channel v0.3.4
[INFO] [stderr]    Compiling proc-macro2 v1.0.12
[INFO] [stderr]     Checking net2 v0.2.34
[INFO] [stderr]     Checking signal-hook-registry v1.2.0
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]    Compiling quote v1.0.4
[INFO] [stderr]    Compiling syn v1.0.18
[INFO] [stderr]     Checking mio-uds v0.6.8
[INFO] [stderr]    Compiling futures-macro v0.3.4
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]     Checking tokio v0.2.20
[INFO] [stderr]     Checking futures-util v0.3.4
[INFO] [stderr]     Checking futures-executor v0.3.4
[INFO] [stderr]     Checking futures v0.3.4
[INFO] [stderr]     Checking echo-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `IpAddr`
[INFO] [stderr]  --> src/easy_net.rs:3:16
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::net::{IpAddr, Ipv4Addr, SocketAddr, SocketAddrV4};
[INFO] [stderr]   |                ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `TcpListener`
[INFO] [stderr]  --> src/easy_net.rs:6:18
[INFO] [stderr]   |
[INFO] [stderr] 6 | use tokio::net::{TcpListener, TcpStream};
[INFO] [stderr]   |                  ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `IpAddr`
[INFO] [stderr]  --> src/easy_net.rs:3:16
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::net::{IpAddr, Ipv4Addr, SocketAddr, SocketAddrV4};
[INFO] [stderr]   |                ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `TcpListener`
[INFO] [stderr]  --> src/easy_net.rs:6:18
[INFO] [stderr]   |
[INFO] [stderr] 6 | use tokio::net::{TcpListener, TcpStream};
[INFO] [stderr]   |                  ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]   --> src/easy_net.rs:15:13
[INFO] [stderr]    |
[INFO] [stderr] 15 |         Err(e) => _get_unspecified_SocketAddr()
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]   --> src/easy_net.rs:22:13
[INFO] [stderr]    |
[INFO] [stderr] 22 |         Err(e) => _get_unspecified_SocketAddr()
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]   --> src/easy_net.rs:15:13
[INFO] [stderr]    |
[INFO] [stderr] 15 |         Err(e) => _get_unspecified_SocketAddr()
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]   --> src/easy_net.rs:22:13
[INFO] [stderr]    |
[INFO] [stderr] 22 |         Err(e) => _get_unspecified_SocketAddr()
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stderr] 
[INFO] [stderr] warning: function `_get_local_SocketAddr` should have a snake case name
[INFO] [stderr]   --> src/easy_net.rs:12:4
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn _get_local_SocketAddr(stream: &TcpStream) -> SocketAddr {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `_get_local_socket_addr`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `_get_peer_SocketAddr` should have a snake case name
[INFO] [stderr]   --> src/easy_net.rs:19:4
[INFO] [stderr]    |
[INFO] [stderr] 19 | fn _get_peer_SocketAddr(stream: &TcpStream) -> SocketAddr {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `_get_peer_socket_addr`
[INFO] [stderr] 
[INFO] [stderr] warning: function `_get_unspecified_SocketAddr` should have a snake case name
[INFO] [stderr]   --> src/easy_net.rs:26:4
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn _get_unspecified_SocketAddr() -> SocketAddr {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `_get_unspecified_socket_addr`
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `local_SocketAddr` should have a snake case name
[INFO] [stderr]   --> src/easy_net.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     pub local_SocketAddr: SocketAddr,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `local_socket_addr`
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `peer_SocketAddr` should have a snake case name
[INFO] [stderr]   --> src/easy_net.rs:52:9
[INFO] [stderr]    |
[INFO] [stderr] 52 |     pub peer_SocketAddr: SocketAddr,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `peer_socket_addr`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `local_SocketAddr` should have a snake case name
[INFO] [stderr]   --> src/easy_net.rs:60:13
[INFO] [stderr]    |
[INFO] [stderr] 60 |         let local_SocketAddr = _get_local_SocketAddr(&stream);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `local_socket_addr`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `peer_SocketAddr` should have a snake case name
[INFO] [stderr]   --> src/easy_net.rs:61:13
[INFO] [stderr]    |
[INFO] [stderr] 61 |         let peer_SocketAddr = _get_peer_SocketAddr(&stream);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `peer_socket_addr`
[INFO] [stderr] 
[INFO] [stderr] warning: function `_get_local_SocketAddr` should have a snake case name
[INFO] [stderr]   --> src/easy_net.rs:12:4
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn _get_local_SocketAddr(stream: &TcpStream) -> SocketAddr {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `_get_local_socket_addr`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `_get_peer_SocketAddr` should have a snake case name
[INFO] [stderr]   --> src/easy_net.rs:19:4
[INFO] [stderr]    |
[INFO] [stderr] 19 | fn _get_peer_SocketAddr(stream: &TcpStream) -> SocketAddr {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `_get_peer_socket_addr`
[INFO] [stderr] 
[INFO] [stderr] warning: function `_get_unspecified_SocketAddr` should have a snake case name
[INFO] [stderr]   --> src/easy_net.rs:26:4
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn _get_unspecified_SocketAddr() -> SocketAddr {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `_get_unspecified_socket_addr`
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `local_SocketAddr` should have a snake case name
[INFO] [stderr]   --> src/easy_net.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     pub local_SocketAddr: SocketAddr,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `local_socket_addr`
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `peer_SocketAddr` should have a snake case name
[INFO] [stderr]   --> src/easy_net.rs:52:9
[INFO] [stderr]    |
[INFO] [stderr] 52 |     pub peer_SocketAddr: SocketAddr,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `peer_socket_addr`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `local_SocketAddr` should have a snake case name
[INFO] [stderr]   --> src/easy_net.rs:60:13
[INFO] [stderr]    |
[INFO] [stderr] 60 |         let local_SocketAddr = _get_local_SocketAddr(&stream);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `local_socket_addr`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `peer_SocketAddr` should have a snake case name
[INFO] [stderr]   --> src/easy_net.rs:61:13
[INFO] [stderr]    |
[INFO] [stderr] 61 |         let peer_SocketAddr = _get_peer_SocketAddr(&stream);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `peer_socket_addr`
[INFO] [stderr] 
[INFO] [stderr] warning: 11 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 11 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `TcpStream`
[INFO] [stderr]  --> src/bin/server.rs:2:31
[INFO] [stderr]   |
[INFO] [stderr] 2 | use tokio::net::{TcpListener, TcpStream};
[INFO] [stderr]   |                               ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/bin/server.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |       /// Bind listener to a port
[INFO] [stderr]    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 12 | /     let mut listener = match TcpListener::bind("127.0.0.1:7777").await {
[INFO] [stderr] 13 | |         Ok(listener) => {
[INFO] [stderr] 14 | |             println!("Server running");
[INFO] [stderr] 15 | |             listener
[INFO] [stderr] ...  |
[INFO] [stderr] 20 | |         }
[INFO] [stderr] 21 | |     };
[INFO] [stderr]    | |______- rustdoc does not generate documentation for statements
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/bin/server.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |       /// Loop over incoming connection
[INFO] [stderr]    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 25 | /     while let Some(tcp_stream) = listener.incoming().map(|res_stream|{
[INFO] [stderr] 26 | |         match res_stream {
[INFO] [stderr] 27 | |             Ok(stream) => Ok(TcpConnection::new(stream)),
[INFO] [stderr] 28 | |             Err(e) => Err(e)
[INFO] [stderr] ...  |
[INFO] [stderr] 38 | |         }
[INFO] [stderr] 39 | |     }
[INFO] [stderr]    | |_____- rustdoc does not generate documentation for expressions
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `recvx`
[INFO] [stderr]   --> src/bin/client.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let recvx = tokio::spawn( async move {
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_recvx`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/bin/client.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let mut stream = TcpStream::connect("127.0.0.1:7777").await?;
[INFO] [stderr]   |         ----^^^^^^
[INFO] [stderr]   |         |
[INFO] [stderr]   |         help: remove this `mut`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/client.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     sendx.await?;
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `TcpStream`
[INFO] [stderr]  --> src/bin/server.rs:2:31
[INFO] [stderr]   |
[INFO] [stderr] 2 | use tokio::net::{TcpListener, TcpStream};
[INFO] [stderr]   |                               ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/bin/server.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |       /// Bind listener to a port
[INFO] [stderr]    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 12 | /     let mut listener = match TcpListener::bind("127.0.0.1:7777").await {
[INFO] [stderr] 13 | |         Ok(listener) => {
[INFO] [stderr] 14 | |             println!("Server running");
[INFO] [stderr] 15 | |             listener
[INFO] [stderr] ...  |
[INFO] [stderr] 20 | |         }
[INFO] [stderr] 21 | |     };
[INFO] [stderr]    | |______- rustdoc does not generate documentation for statements
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/bin/server.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |       /// Loop over incoming connection
[INFO] [stderr]    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 25 | /     while let Some(tcp_stream) = listener.incoming().map(|res_stream|{
[INFO] [stderr] 26 | |         match res_stream {
[INFO] [stderr] 27 | |             Ok(stream) => Ok(TcpConnection::new(stream)),
[INFO] [stderr] 28 | |             Err(e) => Err(e)
[INFO] [stderr] ...  |
[INFO] [stderr] 38 | |         }
[INFO] [stderr] 39 | |     }
[INFO] [stderr]    | |_____- rustdoc does not generate documentation for expressions
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `recvx`
[INFO] [stderr]   --> src/bin/client.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let recvx = tokio::spawn( async move {
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_recvx`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/bin/client.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let mut stream = TcpStream::connect("127.0.0.1:7777").await?;
[INFO] [stderr]   |         ----^^^^^^
[INFO] [stderr]   |         |
[INFO] [stderr]   |         help: remove this `mut`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/client.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     sendx.await?;
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 36.40s
[INFO] running `"docker" "inspect" "310bf4fba19478dde090c83dc71da3c2689be45a2effc7efb9e9f351e807d4d1"`
[INFO] running `"docker" "rm" "-f" "310bf4fba19478dde090c83dc71da3c2689be45a2effc7efb9e9f351e807d4d1"`
[INFO] [stdout] 310bf4fba19478dde090c83dc71da3c2689be45a2effc7efb9e9f351e807d4d1