[INFO] fetching crate backon 0.4.1...
[INFO] checking backon-0.4.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate backon 0.4.1 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate backon 0.4.1 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] removed /workspace/builds/worker-0-tc1/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate backon 0.4.1
[INFO] finished tweaking crates.io crate backon 0.4.1
[INFO] tweaked toml for crates.io crate backon 0.4.1 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate crates.io crate backon 0.4.1 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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pin-project-lite v0.2.9
[INFO] [stderr]   Downloaded parking_lot_core v0.9.3
[INFO] [stderr]   Downloaded socket2 v0.4.7
[INFO] [stderr]   Downloaded tokio-macros v1.8.0
[INFO] [stderr]   Downloaded openssl-macros v0.1.0
[INFO] [stderr]   Downloaded futures-task v0.3.24
[INFO] [stderr]   Downloaded futures-core v0.3.26
[INFO] [stderr]   Downloaded futures-sink v0.3.24
[INFO] [stderr]   Downloaded itoa v1.0.3
[INFO] [stderr]   Downloaded wasm-bindgen-futures v0.4.32
[INFO] [stderr]   Downloaded pin-project-internal v1.0.12
[INFO] [stderr]   Downloaded slab v0.4.7
[INFO] [stderr]   Downloaded schannel v0.1.20
[INFO] [stderr]   Downloaded security-framework-sys v2.6.1
[INFO] [stderr]   Downloaded anyhow v1.0.64
[INFO] [stderr]   Downloaded futures-util v0.3.24
[INFO] [stderr]   Downloaded tokio-util v0.7.3
[INFO] [stderr]   Downloaded windows_x86_64_msvc v0.36.1
[INFO] [stderr]   Downloaded windows_aarch64_msvc v0.36.1
[INFO] [stderr]   Downloaded windows_i686_gnu v0.36.1
[INFO] [stderr]   Downloaded windows_i686_msvc v0.36.1
[INFO] [stderr]   Downloaded windows_x86_64_gnu v0.36.1
[INFO] [stderr]   Downloaded libc v0.2.132
[INFO] [stderr]   Downloaded encoding_rs v0.8.31
[INFO] [stderr]   Downloaded tokio v1.21.0
[INFO] [stderr]   Downloaded h2 v0.3.14
[INFO] [stderr]   Downloaded http v0.2.8
[INFO] [stderr]   Downloaded hyper v0.14.20
[INFO] [stderr]   Downloaded serde_json v1.0.85
[INFO] [stderr]   Downloaded openssl v0.10.41
[INFO] [stderr]   Downloaded openssl-sys v0.9.75
[INFO] [stderr]   Downloaded unicode-normalization v0.1.21
[INFO] [stderr]   Downloaded reqwest v0.11.11
[INFO] [stderr]   Downloaded windows-sys v0.36.1
[INFO] [stderr]   Downloaded mio v0.8.4
[INFO] [stderr]   Downloaded pin-project v1.0.12
[INFO] [stderr]   Downloaded futures-channel v0.3.24
[INFO] [stderr]   Downloaded indexmap v1.9.1
[INFO] [stderr]   Downloaded tracing-core v0.1.29
[INFO] [stderr]   Downloaded tracing v0.1.36
[INFO] [stderr]   Downloaded ipnet v2.5.0
[INFO] [stderr]   Downloaded ryu v1.0.11
[INFO] [stderr]   Downloaded serde v1.0.144
[INFO] [stderr]   Downloaded security-framework v2.7.0
[INFO] [stderr]   Downloaded tempfile v3.3.0
[INFO] [stderr]   Downloaded native-tls v0.2.10
[INFO] [stderr]   Downloaded bumpalo v3.11.0
[INFO] [stderr]   Downloaded winreg v0.10.1
[INFO] [stderr]   Downloaded lock_api v0.4.8
[INFO] [stderr]   Downloaded unicode-bidi v0.3.8
[INFO] [stderr]   Downloaded once_cell v1.14.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] d83e2763d0130874876ceca6299862153793a515cbceaf7df4000be97411ed99
[INFO] running `Command { std: "docker" "start" "-a" "d83e2763d0130874876ceca6299862153793a515cbceaf7df4000be97411ed99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d83e2763d0130874876ceca6299862153793a515cbceaf7df4000be97411ed99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d83e2763d0130874876ceca6299862153793a515cbceaf7df4000be97411ed99", kill_on_drop: false }`
[INFO] [stdout] d83e2763d0130874876ceca6299862153793a515cbceaf7df4000be97411ed99
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 7410ce5a18cceead5b0f7cecd54a0c0496a84c026a07b950c17899292fcaa41a
[INFO] running `Command { std: "docker" "start" "-a" "7410ce5a18cceead5b0f7cecd54a0c0496a84c026a07b950c17899292fcaa41a", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling libc v0.2.132
[INFO] [stderr]    Compiling proc-macro2 v1.0.43
[INFO] [stderr]    Compiling unicode-ident v1.0.3
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling syn v1.0.99
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]     Checking once_cell v1.14.0
[INFO] [stderr]    Compiling parking_lot_core v0.9.3
[INFO] [stderr]     Checking pin-project-lite v0.2.9
[INFO] [stderr]    Compiling cc v1.0.73
[INFO] [stderr]     Checking bytes v1.2.1
[INFO] [stderr]    Compiling futures-core v0.3.26
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]     Checking smallvec v1.9.0
[INFO] [stderr]    Compiling pkg-config v0.3.25
[INFO] [stderr]     Checking itoa v1.0.3
[INFO] [stderr]    Compiling futures-task v0.3.24
[INFO] [stderr]     Checking tracing-core v0.1.29
[INFO] [stderr]    Compiling openssl v0.10.41
[INFO] [stderr]    Compiling futures-util v0.3.24
[INFO] [stderr]     Checking tinyvec_macros v0.1.0
[INFO] [stderr]    Compiling futures-channel v0.3.24
[INFO] [stderr]     Checking futures-sink v0.3.24
[INFO] [stderr]    Compiling lock_api v0.4.8
[INFO] [stderr]    Compiling tokio v1.21.0
[INFO] [stderr]    Compiling indexmap v1.9.1
[INFO] [stderr]    Compiling slab v0.4.7
[INFO] [stderr]     Checking http v0.2.8
[INFO] [stderr]    Compiling native-tls v0.2.10
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking matches v0.1.9
[INFO] [stderr]     Checking tinyvec v1.6.0
[INFO] [stderr]     Checking tracing v0.1.36
[INFO] [stderr]     Checking try-lock v0.2.3
[INFO] [stderr]    Compiling serde v1.0.144
[INFO] [stderr]     Checking percent-encoding v2.1.0
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking httpdate v1.0.2
[INFO] [stderr]     Checking unicode-bidi v0.3.8
[INFO] [stderr]     Checking form_urlencoded v1.0.1
[INFO] [stderr]    Compiling encoding_rs v0.8.31
[INFO] [stderr]     Checking ryu v1.0.11
[INFO] [stderr]    Compiling anyhow v1.0.64
[INFO] [stderr]     Checking ipnet v2.5.0
[INFO] [stderr]     Checking base64 v0.13.0
[INFO] [stderr]     Checking mime v0.3.16
[INFO] [stderr]     Checking mio v0.8.4
[INFO] [stderr]     Checking signal-hook-registry v1.4.0
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking socket2 v0.4.7
[INFO] [stderr]     Checking http-body v0.4.5
[INFO] [stderr]    Compiling openssl-sys v0.9.75
[INFO] [stderr]     Checking parking_lot v0.12.1
[INFO] [stderr]     Checking unicode-normalization v0.1.21
[INFO] [stderr]     Checking idna v0.2.3
[INFO] [stderr]     Checking url v2.2.2
[INFO] [stderr]     Checking serde_urlencoded v0.7.1
[INFO] [stderr]    Compiling tokio-macros v1.8.0
[INFO] [stderr]    Compiling openssl-macros v0.1.0
[INFO] [stderr]    Compiling pin-project-internal v1.0.12
[INFO] [stderr]     Checking pin-project v1.0.12
[INFO] [stderr]     Checking tokio-util v0.7.3
[INFO] [stderr]     Checking tokio-native-tls v0.3.0
[INFO] [stderr]     Checking backon v0.4.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking h2 v0.3.14
[INFO] [stderr]     Checking hyper v0.14.20
[INFO] [stderr]     Checking hyper-tls v0.5.0
[INFO] [stderr]     Checking reqwest v0.11.11
[INFO] [stdout] warning: the item `Duration` is imported redundantly
[INFO] [stdout]    --> src/retry.rs:287:9
[INFO] [stdout]     |
[INFO] [stdout] 287 |     use std::time::Duration;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 291 |     use super::*;
[INFO] [stdout]     |         -------- the item `Duration` is already imported here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Duration` is imported redundantly
[INFO] [stdout]    --> src/blocking_retry.rs:200:9
[INFO] [stdout]     |
[INFO] [stdout] 200 |     use std::time::Duration;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 201 |
[INFO] [stdout] 202 |     use super::*;
[INFO] [stdout]     |         -------- the item `Duration` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.86s
[INFO] running `Command { std: "docker" "inspect" "7410ce5a18cceead5b0f7cecd54a0c0496a84c026a07b950c17899292fcaa41a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7410ce5a18cceead5b0f7cecd54a0c0496a84c026a07b950c17899292fcaa41a", kill_on_drop: false }`
[INFO] [stdout] 7410ce5a18cceead5b0f7cecd54a0c0496a84c026a07b950c17899292fcaa41a