[INFO] fetching crate cadence 1.0.0...
[INFO] checking cadence-1.0.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate cadence 1.0.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate cadence 1.0.0 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cadence 1.0.0
[INFO] finished tweaking crates.io crate cadence 1.0.0
[INFO] tweaked toml for crates.io crate cadence 1.0.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate crates.io crate cadence 1.0.0 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 29e26f0727466a0d1786dc4b9659d26e176be0fe89d0a737a73ff7be2a1cbf2b
[INFO] running `Command { std: "docker" "start" "-a" "29e26f0727466a0d1786dc4b9659d26e176be0fe89d0a737a73ff7be2a1cbf2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "29e26f0727466a0d1786dc4b9659d26e176be0fe89d0a737a73ff7be2a1cbf2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "29e26f0727466a0d1786dc4b9659d26e176be0fe89d0a737a73ff7be2a1cbf2b", kill_on_drop: false }`
[INFO] [stdout] 29e26f0727466a0d1786dc4b9659d26e176be0fe89d0a737a73ff7be2a1cbf2b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3692c2d91a3a5e4299024c9d9d6044c0b457f2699259377a37658d0f6857e9b1
[INFO] running `Command { std: "docker" "start" "-a" "3692c2d91a3a5e4299024c9d9d6044c0b457f2699259377a37658d0f6857e9b1", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.16
[INFO] [stderr]     Checking crossbeam-channel v0.5.8
[INFO] [stderr]     Checking cadence v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `crossbeam_channel` is imported redundantly
[INFO] [stdout]   --> src/sinks/queuing.rs:12:25
[INFO] [stdout]    |
[INFO] [stdout] 12 | use crossbeam_channel::{self, Receiver, Sender, TrySendError};
[INFO] [stdout]    |                         ^^^^ the item `crossbeam_channel` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `crossbeam_channel` is imported redundantly
[INFO] [stdout]   --> src/sinks/queuing.rs:12:25
[INFO] [stdout]    |
[INFO] [stdout] 12 | use crossbeam_channel::{self, Receiver, Sender, TrySendError};
[INFO] [stdout]    |                         ^^^^ the item `crossbeam_channel` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.95s
[INFO] running `Command { std: "docker" "inspect" "3692c2d91a3a5e4299024c9d9d6044c0b457f2699259377a37658d0f6857e9b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3692c2d91a3a5e4299024c9d9d6044c0b457f2699259377a37658d0f6857e9b1", kill_on_drop: false }`
[INFO] [stdout] 3692c2d91a3a5e4299024c9d9d6044c0b457f2699259377a37658d0f6857e9b1
[INFO] checking cadence-1.0.0 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] extracting crate cadence 1.0.0 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate cadence 1.0.0 on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cadence 1.0.0
[INFO] finished tweaking crates.io crate cadence 1.0.0
[INFO] tweaked toml for crates.io crate cadence 1.0.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate crates.io crate cadence 1.0.0 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7335d9bb17f58bf2ba58074378f01bb394259b9183964a7e659ac9a15b4fa6e9
[INFO] running `Command { std: "docker" "start" "-a" "7335d9bb17f58bf2ba58074378f01bb394259b9183964a7e659ac9a15b4fa6e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7335d9bb17f58bf2ba58074378f01bb394259b9183964a7e659ac9a15b4fa6e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7335d9bb17f58bf2ba58074378f01bb394259b9183964a7e659ac9a15b4fa6e9", kill_on_drop: false }`
[INFO] [stdout] 7335d9bb17f58bf2ba58074378f01bb394259b9183964a7e659ac9a15b4fa6e9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 20866c5d29938ccf04d3f2caa000f10ed197eec6929e11ed9f2ddea1392dfcbf
[INFO] running `Command { std: "docker" "start" "-a" "20866c5d29938ccf04d3f2caa000f10ed197eec6929e11ed9f2ddea1392dfcbf", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.16
[INFO] [stderr]     Checking crossbeam-channel v0.5.8
[INFO] [stderr]     Checking cadence v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `crossbeam_channel` is imported redundantly
[INFO] [stdout]   --> src/sinks/queuing.rs:12:25
[INFO] [stdout]    |
[INFO] [stdout] 12 | use crossbeam_channel::{self, Receiver, Sender, TrySendError};
[INFO] [stdout]    |                         ^^^^ the item `crossbeam_channel` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `crossbeam_channel` is imported redundantly
[INFO] [stdout]   --> src/sinks/queuing.rs:12:25
[INFO] [stdout]    |
[INFO] [stdout] 12 | use crossbeam_channel::{self, Receiver, Sender, TrySendError};
[INFO] [stdout]    |                         ^^^^ the item `crossbeam_channel` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.85s
[INFO] running `Command { std: "docker" "inspect" "20866c5d29938ccf04d3f2caa000f10ed197eec6929e11ed9f2ddea1392dfcbf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20866c5d29938ccf04d3f2caa000f10ed197eec6929e11ed9f2ddea1392dfcbf", kill_on_drop: false }`
[INFO] [stdout] 20866c5d29938ccf04d3f2caa000f10ed197eec6929e11ed9f2ddea1392dfcbf