[INFO] fetching crate caspaxos-kv 0.2.2...
[INFO] checking caspaxos-kv-0.2.2 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate caspaxos-kv 0.2.2 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate caspaxos-kv 0.2.2 on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate caspaxos-kv 0.2.2
[INFO] finished tweaking crates.io crate caspaxos-kv 0.2.2
[INFO] tweaked toml for crates.io crate caspaxos-kv 0.2.2 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate crates.io crate caspaxos-kv 0.2.2 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded instant v0.1.8
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[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8e6f05b76ab142d1a6239101b92fd33fcc4b319af897e6a6522c1d8c589c7087
[INFO] running `Command { std: "docker" "start" "-a" "8e6f05b76ab142d1a6239101b92fd33fcc4b319af897e6a6522c1d8c589c7087", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8e6f05b76ab142d1a6239101b92fd33fcc4b319af897e6a6522c1d8c589c7087", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e6f05b76ab142d1a6239101b92fd33fcc4b319af897e6a6522c1d8c589c7087", kill_on_drop: false }`
[INFO] [stdout] 8e6f05b76ab142d1a6239101b92fd33fcc4b319af897e6a6522c1d8c589c7087
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2bf7e54cdb8012371997890a135e7e685d093a232325f2137f247dc39db06cad
[INFO] running `Command { std: "docker" "start" "-a" "2bf7e54cdb8012371997890a135e7e685d093a232325f2137f247dc39db06cad", kill_on_drop: false }`
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[INFO] [stderr]     Checking futures-core v0.3.7
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[INFO] [stderr]     Checking ppv-lite86 v0.2.9
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[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]     Checking instant v0.1.8
[INFO] [stderr]    Compiling miniz_oxide v0.4.3
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]     Checking smallvec v1.4.2
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[INFO] [stderr]     Checking backtrace v0.3.53
[INFO] [stderr]     Checking caspaxos-kv v0.2.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking color-backtrace v0.4.2
[INFO] [stdout] warning: the item `io` is imported redundantly
[INFO] [stdout]  --> src/paxos.rs:1:33
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{collections::HashMap, io, net::SocketAddr, time::Duration};
[INFO] [stdout]   |                                 ^^
[INFO] [stdout] ...
[INFO] [stdout] 6 | use super::*;
[INFO] [stdout]   |     -------- the item `io` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking quickcheck v0.9.2
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/udp_net.rs:78:13
[INFO] [stdout]    |
[INFO] [stdout] 78 |             unsafe {
[INFO] [stdout]    |             ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/simulator.rs:114:10
[INFO] [stdout]     |
[INFO] [stdout] 114 |     Loss(OneshotSender<Response>),
[INFO] [stdout]     |     ---- ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     field in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]     |
[INFO] [stdout] 114 |     Loss(()),
[INFO] [stdout]     |          ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `io` is imported redundantly
[INFO] [stdout]  --> src/paxos.rs:1:33
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{collections::HashMap, io, net::SocketAddr, time::Duration};
[INFO] [stdout]   |                                 ^^
[INFO] [stdout] ...
[INFO] [stdout] 6 | use super::*;
[INFO] [stdout]   |     -------- the item `io` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/udp_net.rs:78:13
[INFO] [stdout]    |
[INFO] [stdout] 78 |             unsafe {
[INFO] [stdout]    |             ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/simulator.rs:114:10
[INFO] [stdout]     |
[INFO] [stdout] 114 |     Loss(OneshotSender<Response>),
[INFO] [stdout]     |     ---- ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     field in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]     |
[INFO] [stdout] 114 |     Loss(()),
[INFO] [stdout]     |          ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.86s
[INFO] running `Command { std: "docker" "inspect" "2bf7e54cdb8012371997890a135e7e685d093a232325f2137f247dc39db06cad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2bf7e54cdb8012371997890a135e7e685d093a232325f2137f247dc39db06cad", kill_on_drop: false }`
[INFO] [stdout] 2bf7e54cdb8012371997890a135e7e685d093a232325f2137f247dc39db06cad