[INFO] cloning repository https://github.com/larvvae/playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/larvvae/playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flarvvae%2Fplayground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flarvvae%2Fplayground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 86029851730bf921b834b68a021b0d0f099e2443
[INFO] checking larvvae/playground against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flarvvae%2Fplayground" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/larvvae/playground on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/larvvae/playground
[INFO] finished tweaking git repo https://github.com/larvvae/playground
[INFO] tweaked toml for git repo https://github.com/larvvae/playground written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/larvvae/playground already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--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-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b05bcf6fd69a4810cb220320813d4ddfd3dea930fef7797a6967dbf82d0d246a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b05bcf6fd69a4810cb220320813d4ddfd3dea930fef7797a6967dbf82d0d246a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b05bcf6fd69a4810cb220320813d4ddfd3dea930fef7797a6967dbf82d0d246a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b05bcf6fd69a4810cb220320813d4ddfd3dea930fef7797a6967dbf82d0d246a", kill_on_drop: false }`
[INFO] [stdout] b05bcf6fd69a4810cb220320813d4ddfd3dea930fef7797a6967dbf82d0d246a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9f9fe13d7938d873ee9085d8755d4988780635be3c07f0953ecf4085499ebabd
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "9f9fe13d7938d873ee9085d8755d4988780635be3c07f0953ecf4085499ebabd", kill_on_drop: false }`
[INFO] [stderr]    Compiling protobuf v2.8.1
[INFO] [stderr]    Compiling slog v2.5.2
[INFO] [stderr]     Checking futures-channel v0.3.1
[INFO] [stderr]     Checking dirs-sys v0.3.4
[INFO] [stderr]     Checking chrono v0.4.10
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking error-chain v0.12.1
[INFO] [stderr]    Compiling getset v0.0.7
[INFO] [stderr]    Compiling clap_derive v0.3.0 (https://github.com/clap-rs/clap_derive#4a46684b)
[INFO] [stderr]    Compiling slog_derive v0.1.1
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling tokio-macros v0.2.0
[INFO] [stderr]     Checking crossbeam v0.7.3
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]     Checking term v0.6.1
[INFO] [stderr]     Checking slog-scope v4.3.0
[INFO] [stderr]     Checking slog-async v2.3.0
[INFO] [stderr]     Checking slog-global v0.1.0 (https://github.com/breeswish/slog-global.git?rev=0e23a5baff302a9d7bccd85f8f31e43339c2f2c1#0e23a5ba)
[INFO] [stderr]     Checking slog-term v2.4.2
[INFO] [stderr]     Checking slog-stdlog v4.0.0
[INFO] [stderr]     Checking slog-envlogger v2.2.0
[INFO] [stderr]    Compiling failure_derive v0.1.6
[INFO] [stderr]     Checking clap v3.0.0-beta.1 (https://github.com/clap-rs/clap.git?rev=a2f9fb5f6c2aeeac89c5c638f25dedb9e50bde00#a2f9fb5f)
[INFO] [stderr]     Checking tokio v0.2.4
[INFO] [stderr]    Compiling futures-macro v0.3.1
[INFO] [stderr]    Compiling failure v0.1.6
[INFO] [stderr]    Compiling prost-derive v0.5.0
[INFO] [stderr]     Checking futures-util v0.3.1
[INFO] [stderr]    Compiling protobuf-codegen v2.8.1
[INFO] [stderr]    Compiling protobuf-build v0.10.0
[INFO] [stderr]     Checking prost v0.5.0
[INFO] [stderr]     Checking futures-executor v0.3.1
[INFO] [stderr]     Checking futures v0.3.1
[INFO] [stderr]    Compiling raft-proto v0.6.0-alpha (https://github.com/tikv/raft-rs.git?rev=f7f7d0121132ef6406b59fc774778285cd1477d6#f7f7d012)
[INFO] [stderr]     Checking raft v0.6.0-alpha (https://github.com/tikv/raft-rs.git?rev=f7f7d0121132ef6406b59fc774778285cd1477d6#f7f7d012)
[INFO] [stderr]     Checking playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `AsyncRead`, `AsyncWrite`
[INFO] [stdout]  --> src/kf_log/log.rs:5:10
[INFO] [stdout]   |
[INFO] [stdout] 5 | use io::{AsyncRead, AsyncWrite};
[INFO] [stdout]   |          ^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Path`
[INFO] [stdout]  --> src/kf_log/writer.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |     Path,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::prelude::*`
[INFO] [stdout]  --> src/tk_echo.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use tokio::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::net::TcpListener`
[INFO] [stdout]   --> src/main.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 | use tokio::net::TcpListener;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::prelude::*`
[INFO] [stdout]   --> src/main.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 | use tokio::prelude::*;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `AsyncRead`, `AsyncWrite`
[INFO] [stdout]  --> src/kf_log/log.rs:5:10
[INFO] [stdout]   |
[INFO] [stdout] 5 | use io::{AsyncRead, AsyncWrite};
[INFO] [stdout]   |          ^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Path`
[INFO] [stdout]  --> src/kf_log/writer.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |     Path,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::prelude::*`
[INFO] [stdout]  --> src/tk_echo.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use tokio::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::net::TcpListener`
[INFO] [stdout]   --> src/main.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 | use tokio::net::TcpListener;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::prelude::*`
[INFO] [stdout]   --> src/main.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 | use tokio::prelude::*;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `futures::stream::StreamExt`
[INFO] [stdout]   --> src/main.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use futures::stream::StreamExt;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `futures::stream::StreamExt`
[INFO] [stdout]   --> src/main.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use futures::stream::StreamExt;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `dir`
[INFO] [stdout]   --> src/kf_log/log.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     dir: PathBuf,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `meta`
[INFO] [stdout]   --> src/kf_log/log.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     meta: PathBuf,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `opts_paths`
[INFO] [stdout]   --> src/kf_log/log.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     opts_paths: Vec<PathBuf>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `obj_paths`
[INFO] [stdout]   --> src/kf_log/log.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     obj_paths: Vec<PathBuf>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `log_paths`
[INFO] [stdout]   --> src/kf_log/log.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     log_paths: Vec<PathBuf>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `LoggedReader`
[INFO] [stdout]  --> src/kf_log/reader.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct LoggedReader {
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `LoggedWriter`
[INFO] [stdout]   --> src/kf_log/writer.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct LoggedWriter<L> where L: AsRef<Log> {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `dir`
[INFO] [stdout]   --> src/kf_log/log.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     dir: PathBuf,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `meta`
[INFO] [stdout]   --> src/kf_log/log.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     meta: PathBuf,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `opts_paths`
[INFO] [stdout]   --> src/kf_log/log.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     opts_paths: Vec<PathBuf>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `obj_paths`
[INFO] [stdout]   --> src/kf_log/log.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     obj_paths: Vec<PathBuf>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `log_paths`
[INFO] [stdout]   --> src/kf_log/log.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     log_paths: Vec<PathBuf>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `LoggedReader`
[INFO] [stdout]  --> src/kf_log/reader.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct LoggedReader {
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `LoggedWriter`
[INFO] [stdout]   --> src/kf_log/writer.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct LoggedWriter<L> where L: AsRef<Log> {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 48.15s
[INFO] running `Command { std: "docker" "inspect" "9f9fe13d7938d873ee9085d8755d4988780635be3c07f0953ecf4085499ebabd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f9fe13d7938d873ee9085d8755d4988780635be3c07f0953ecf4085499ebabd", kill_on_drop: false }`
[INFO] [stdout] 9f9fe13d7938d873ee9085d8755d4988780635be3c07f0953ecf4085499ebabd