[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 try#3f7e3b175fda7edbf81081bcd9b91b73f2f7993f for pr-156157
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsergiu128%2Fmirrored-buffer" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[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-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/sergiu128/mirrored-buffer on toolchain 3f7e3b175fda7edbf81081bcd9b91b73f2f7993f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3f7e3b175fda7edbf81081bcd9b91b73f2f7993f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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" "+3f7e3b175fda7edbf81081bcd9b91b73f2f7993f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+3f7e3b175fda7edbf81081bcd9b91b73f2f7993f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] abc8a95dcb44f56ad85e046018fabee52d9c81d2b638b16d1b26498d92ed8c9e
[INFO] running `Command { std: "docker" "start" "-a" "abc8a95dcb44f56ad85e046018fabee52d9c81d2b638b16d1b26498d92ed8c9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "abc8a95dcb44f56ad85e046018fabee52d9c81d2b638b16d1b26498d92ed8c9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "abc8a95dcb44f56ad85e046018fabee52d9c81d2b638b16d1b26498d92ed8c9e", kill_on_drop: false }`
[INFO] [stdout] abc8a95dcb44f56ad85e046018fabee52d9c81d2b638b16d1b26498d92ed8c9e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+3f7e3b175fda7edbf81081bcd9b91b73f2f7993f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8860c6b1e3cf0944844192b75e1523ca8f49ba2d03526ae1731fa6d374b2e7c6
[INFO] running `Command { std: "docker" "start" "-a" "8860c6b1e3cf0944844192b75e1523ca8f49ba2d03526ae1731fa6d374b2e7c6", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.158
[INFO] [stderr]    Compiling syn v2.0.76
[INFO] [stderr]     Checking getrandom v0.2.15
[INFO] [stderr]     Checking rand_core v0.6.4
[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)]` (part of `#[warn(unused)]`) 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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `conn`
[INFO] [stdout]   --> examples/tcp.rs:41:14
[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)]` (part of `#[warn(unused)]`) 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)]` (part of `#[warn(unused)]`) 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 5.72s
[INFO] running `Command { std: "docker" "inspect" "8860c6b1e3cf0944844192b75e1523ca8f49ba2d03526ae1731fa6d374b2e7c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8860c6b1e3cf0944844192b75e1523ca8f49ba2d03526ae1731fa6d374b2e7c6", kill_on_drop: false }`
[INFO] [stdout] 8860c6b1e3cf0944844192b75e1523ca8f49ba2d03526ae1731fa6d374b2e7c6