[INFO] cloning repository https://github.com/sergiu128/mirrored-buffer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sergiu128/mirrored-buffer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsergiu128%2Fmirrored-buffer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsergiu128%2Fmirrored-buffer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2ac66bc19f6b2de520871a3b71b40d3509ac3e18
[INFO] checking sergiu128/mirrored-buffer against master#068609ce766e55d2e7371cd2a86143a6d7e8e2e4 for pr-138952
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsergiu128%2Fmirrored-buffer" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sergiu128/mirrored-buffer on toolchain 068609ce766e55d2e7371cd2a86143a6d7e8e2e4
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+068609ce766e55d2e7371cd2a86143a6d7e8e2e4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sergiu128/mirrored-buffer
[INFO] finished tweaking git repo https://github.com/sergiu128/mirrored-buffer
[INFO] tweaked toml for git repo https://github.com/sergiu128/mirrored-buffer written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/sergiu128/mirrored-buffer 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" "+068609ce766e55d2e7371cd2a86143a6d7e8e2e4" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4b26683ee3c49f365255c425c23003cbf4366de097804722c29c5bbbee3624d2" "/opt/rustwide/cargo-home/bin/cargo" "+068609ce766e55d2e7371cd2a86143a6d7e8e2e4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f359c2e42bced04917ff955d694d69d442e69dce3141dddc31481e36e2df8ca0
[INFO] running `Command { std: "docker" "start" "-a" "f359c2e42bced04917ff955d694d69d442e69dce3141dddc31481e36e2df8ca0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f359c2e42bced04917ff955d694d69d442e69dce3141dddc31481e36e2df8ca0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f359c2e42bced04917ff955d694d69d442e69dce3141dddc31481e36e2df8ca0", kill_on_drop: false }`
[INFO] [stdout] f359c2e42bced04917ff955d694d69d442e69dce3141dddc31481e36e2df8ca0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4b26683ee3c49f365255c425c23003cbf4366de097804722c29c5bbbee3624d2" "/opt/rustwide/cargo-home/bin/cargo" "+068609ce766e55d2e7371cd2a86143a6d7e8e2e4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f069068d3ae5169833abdcd9371c875de19eb20b33abc437348faa3c1a388f09
[INFO] running `Command { std: "docker" "start" "-a" "f069068d3ae5169833abdcd9371c875de19eb20b33abc437348faa3c1a388f09", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.86
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling libc v0.2.158
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking byteorder v1.5.0
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]     Checking getrandom v0.2.15
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]    Compiling syn v2.0.76
[INFO] [stderr]    Compiling zerocopy-derive v0.7.35
[INFO] [stderr]     Checking zerocopy v0.7.35
[INFO] [stderr]     Checking ppv-lite86 v0.2.20
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking mirrored-buffer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `AtomicU16`, `Ordering`, `Read`, `SocketAddrV4`, `Write`, and `self`
[INFO] [stdout]  --> examples/tcp.rs:2:17
[INFO] [stdout]   |
[INFO] [stdout] 2 |     io::{Error, Read, Write},
[INFO] [stdout]   |                 ^^^^  ^^^^^
[INFO] [stdout] 3 |     net::{self, SocketAddr, SocketAddrV4, TcpListener, TcpStream},
[INFO] [stdout]   |           ^^^^              ^^^^^^^^^^^^
[INFO] [stdout] 4 |     str,
[INFO] [stdout] 5 |     sync::atomic::{AtomicU16, Ordering},
[INFO] [stdout]   |                    ^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `conn`
[INFO] [stdout]   --> examples/tcp.rs:41:18
[INFO] [stdout]    |
[INFO] [stdout] 41 |         let (mut conn, peer_addr) = self.ln.accept()?;
[INFO] [stdout]    |                  ^^^^ help: if this is intentional, prefix it with an underscore: `_conn`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> examples/tcp.rs:41:14
[INFO] [stdout]    |
[INFO] [stdout] 41 |         let (mut conn, peer_addr) = self.ln.accept()?;
[INFO] [stdout]    |              ----^^^^
[INFO] [stdout]    |              |
[INFO] [stdout]    |              help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Frame` is never constructed
[INFO] [stdout]   --> examples/tcp.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Frame {}
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `buf` is never read
[INFO] [stdout]   --> examples/tcp.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct Server<'a> {
[INFO] [stdout]    |        ------ field in this struct
[INFO] [stdout] 14 |     buf: MirroredBuffer<'a>,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `buf`, `conn`, and `local_addr` are never read
[INFO] [stdout]   --> examples/tcp.rs:65:5
[INFO] [stdout]    |
[INFO] [stdout] 64 | struct Client<'a> {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 65 |     buf: MirroredBuffer<'a>,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 66 |     conn: TcpStream,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 67 |     pub local_addr: SocketAddr,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.81s
[INFO] running `Command { std: "docker" "inspect" "f069068d3ae5169833abdcd9371c875de19eb20b33abc437348faa3c1a388f09", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f069068d3ae5169833abdcd9371c875de19eb20b33abc437348faa3c1a388f09", kill_on_drop: false }`
[INFO] [stdout] f069068d3ae5169833abdcd9371c875de19eb20b33abc437348faa3c1a388f09