[INFO] cloning repository https://github.com/BB20101997/Learning-Rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/BB20101997/Learning-Rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBB20101997%2FLearning-Rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBB20101997%2FLearning-Rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] eecc7641c615d22bbe90339c6ae82870aa33a51b
[INFO] checking BB20101997/Learning-Rust against master#22572d0994593197593e2a1b7b18d720a9a349a7 for pr-126452-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBB20101997%2FLearning-Rust" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/BB20101997/Learning-Rust on toolchain 22572d0994593197593e2a1b7b18d720a9a349a7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/BB20101997/Learning-Rust
[INFO] finished tweaking git repo https://github.com/BB20101997/Learning-Rust
[INFO] tweaked toml for git repo https://github.com/BB20101997/Learning-Rust written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/BB20101997/Learning-Rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6411fb7ea149f0bb5ad728c3508c0f00ddea9e11f0f481d8893489e6ac513c6c
[INFO] running `Command { std: "docker" "start" "-a" "6411fb7ea149f0bb5ad728c3508c0f00ddea9e11f0f481d8893489e6ac513c6c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6411fb7ea149f0bb5ad728c3508c0f00ddea9e11f0f481d8893489e6ac513c6c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6411fb7ea149f0bb5ad728c3508c0f00ddea9e11f0f481d8893489e6ac513c6c", kill_on_drop: false }`
[INFO] [stdout] 6411fb7ea149f0bb5ad728c3508c0f00ddea9e11f0f481d8893489e6ac513c6c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1338b30e656c1617a3fea2b8775bc1d731feff982874cce6141b32e72f242d99
[INFO] running `Command { std: "docker" "start" "-a" "1338b30e656c1617a3fea2b8775bc1d731feff982874cce6141b32e72f242d99", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]     Checking quote v1.0.9
[INFO] [stderr]     Checking macros v0.1.0 (/opt/rustwide/workdir/macros)
[INFO] [stderr]     Checking base_lib v0.1.0 (/opt/rustwide/workdir/base_lib)
[INFO] [stderr]     Checking network_lib v0.1.0 (/opt/rustwide/workdir/network_lib)
[INFO] [stdout] warning: method `flush` is never used
[INFO] [stdout]   --> network_lib/src/network/serialization.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl<'a> ReadWrite<'a> {
[INFO] [stdout]    | ---------------------- method in this implementation
[INFO] [stdout] 20 |     fn flush(&mut self) -> Result<()> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `flush` is never used
[INFO] [stdout]   --> network_lib/src/network/serialization.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl<'a> ReadWrite<'a> {
[INFO] [stdout]    | ---------------------- method in this implementation
[INFO] [stdout] 20 |     fn flush(&mut self) -> Result<()> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chat_base v0.1.0 (/opt/rustwide/workdir/chat_base)
[INFO] [stderr]     Checking macros_test v0.1.0 (/opt/rustwide/workdir/macros_test)
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chat_client v0.1.0 (/opt/rustwide/workdir/chat_client)
[INFO] [stderr]     Checking chat_server v0.1.0 (/opt/rustwide/workdir/chat_server)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.31s
[INFO] running `Command { std: "docker" "inspect" "1338b30e656c1617a3fea2b8775bc1d731feff982874cce6141b32e72f242d99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1338b30e656c1617a3fea2b8775bc1d731feff982874cce6141b32e72f242d99", kill_on_drop: false }`
[INFO] [stdout] 1338b30e656c1617a3fea2b8775bc1d731feff982874cce6141b32e72f242d99
[INFO] checking BB20101997/Learning-Rust against try#6289438dbad80b1a0029c66dd3f6abf57c2c51be for pr-126452-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBB20101997%2FLearning-Rust" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/BB20101997/Learning-Rust on toolchain 6289438dbad80b1a0029c66dd3f6abf57c2c51be
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/BB20101997/Learning-Rust
[INFO] finished tweaking git repo https://github.com/BB20101997/Learning-Rust
[INFO] tweaked toml for git repo https://github.com/BB20101997/Learning-Rust written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/BB20101997/Learning-Rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 66f48f3278f978cd2df9568e0fda931c396b035bba62256f1f7de3d3aa18c273
[INFO] running `Command { std: "docker" "start" "-a" "66f48f3278f978cd2df9568e0fda931c396b035bba62256f1f7de3d3aa18c273", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "66f48f3278f978cd2df9568e0fda931c396b035bba62256f1f7de3d3aa18c273", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "66f48f3278f978cd2df9568e0fda931c396b035bba62256f1f7de3d3aa18c273", kill_on_drop: false }`
[INFO] [stdout] 66f48f3278f978cd2df9568e0fda931c396b035bba62256f1f7de3d3aa18c273
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 25b6306a2faefd4a2130274dff98771f9c41facb9c3eaf2f1895d63c54837303
[INFO] running `Command { std: "docker" "start" "-a" "25b6306a2faefd4a2130274dff98771f9c41facb9c3eaf2f1895d63c54837303", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]     Checking quote v1.0.9
[INFO] [stderr]     Checking macros v0.1.0 (/opt/rustwide/workdir/macros)
[INFO] [stderr]     Checking base_lib v0.1.0 (/opt/rustwide/workdir/base_lib)
[INFO] [stderr]     Checking network_lib v0.1.0 (/opt/rustwide/workdir/network_lib)
[INFO] [stdout] warning: method `flush` is never used
[INFO] [stdout]   --> network_lib/src/network/serialization.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl<'a> ReadWrite<'a> {
[INFO] [stdout]    | ---------------------- method in this implementation
[INFO] [stdout] 20 |     fn flush(&mut self) -> Result<()> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `flush` is never used
[INFO] [stdout]   --> network_lib/src/network/serialization.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl<'a> ReadWrite<'a> {
[INFO] [stdout]    | ---------------------- method in this implementation
[INFO] [stdout] 20 |     fn flush(&mut self) -> Result<()> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chat_base v0.1.0 (/opt/rustwide/workdir/chat_base)
[INFO] [stderr]     Checking macros_test v0.1.0 (/opt/rustwide/workdir/macros_test)
[INFO] [stderr]     Checking chat_server v0.1.0 (/opt/rustwide/workdir/chat_server)
[INFO] [stderr]     Checking chat_client v0.1.0 (/opt/rustwide/workdir/chat_client)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.28s
[INFO] running `Command { std: "docker" "inspect" "25b6306a2faefd4a2130274dff98771f9c41facb9c3eaf2f1895d63c54837303", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "25b6306a2faefd4a2130274dff98771f9c41facb9c3eaf2f1895d63c54837303", kill_on_drop: false }`
[INFO] [stdout] 25b6306a2faefd4a2130274dff98771f9c41facb9c3eaf2f1895d63c54837303