[INFO] fetching crate cracken 1.0.1...
[INFO] checking cracken-1.0.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate cracken 1.0.1 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate cracken 1.0.1 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] started tweaking crates.io crate cracken 1.0.1
[INFO] finished tweaking crates.io crate cracken 1.0.1
[INFO] tweaked toml for crates.io crate cracken 1.0.1 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate crates.io crate cracken 1.0.1 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]     Updating crates.io index
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 1331c910a4a0b147709d534f409bb2832b02ada3a8a6b49e980bee717e456632
[INFO] running `Command { std: "docker" "start" "-a" "1331c910a4a0b147709d534f409bb2832b02ada3a8a6b49e980bee717e456632", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1331c910a4a0b147709d534f409bb2832b02ada3a8a6b49e980bee717e456632", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1331c910a4a0b147709d534f409bb2832b02ada3a8a6b49e980bee717e456632", kill_on_drop: false }`
[INFO] [stdout] 1331c910a4a0b147709d534f409bb2832b02ada3a8a6b49e980bee717e456632
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 7d6e5bd86edd94bef959f284d4bd9ac3f02ac52717a719f0bd5c2bd917f67ca2
[INFO] running `Command { std: "docker" "start" "-a" "7d6e5bd86edd94bef959f284d4bd9ac3f02ac52717a719f0bd5c2bd917f67ca2", kill_on_drop: false }`
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[INFO] [stderr]    Compiling cargo-lock v4.0.1
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[INFO] [stderr]    Compiling cracken v1.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/create_smartlist.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/create_smartlist.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[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 1m 02s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: cargo-lock v4.0.1, criterion v0.3.5, nom v6.2.1
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 2`
[INFO] running `Command { std: "docker" "inspect" "7d6e5bd86edd94bef959f284d4bd9ac3f02ac52717a719f0bd5c2bd917f67ca2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d6e5bd86edd94bef959f284d4bd9ac3f02ac52717a719f0bd5c2bd917f67ca2", kill_on_drop: false }`
[INFO] [stdout] 7d6e5bd86edd94bef959f284d4bd9ac3f02ac52717a719f0bd5c2bd917f67ca2