[INFO] fetching crate clobber 0.3.0...
[INFO] checking clobber-0.3.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate clobber 0.3.0 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate clobber 0.3.0 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 clobber 0.3.0
[INFO] finished tweaking crates.io crate clobber 0.3.0
[INFO] tweaked toml for crates.io crate clobber 0.3.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate crates.io crate clobber 0.3.0 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] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded spin_sleep v0.3.7
[INFO] [stderr]   Downloaded rand v0.7.0
[INFO] [stderr]   Downloaded getrandom v0.1.11
[INFO] [stderr]   Downloaded serde_derive v1.0.102
[INFO] [stderr]   Downloaded futures-sink-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded async-task v1.0.0
[INFO] [stderr]   Downloaded redox_syscall v0.1.56
[INFO] [stderr]   Downloaded mio v0.6.19
[INFO] [stderr]   Downloaded async-std v0.99.4
[INFO] [stderr]   Downloaded atty v0.2.13
[INFO] [stderr]   Downloaded unicode-width v0.1.6
[INFO] [stderr]   Downloaded vec_map v0.8.1
[INFO] [stderr]   Downloaded csv v1.1.1
[INFO] [stderr]   Downloaded cast v0.2.2
[INFO] [stderr]   Downloaded criterion-plot v0.3.1
[INFO] [stderr]   Downloaded regex-automata v0.1.8
[INFO] [stderr]   Downloaded csv-core v0.1.6
[INFO] [stderr]   Downloaded itertools v0.8.0
[INFO] [stderr]   Downloaded autocfg v0.1.6
[INFO] [stderr]   Downloaded num-traits v0.2.8
[INFO] [stderr]   Downloaded byteorder v1.3.2
[INFO] [stderr]   Downloaded either v1.5.2
[INFO] [stderr]   Downloaded rayon v1.1.0
[INFO] [stderr]   Downloaded crossbeam-queue v0.1.2
[INFO] [stderr]   Downloaded tinytemplate v1.0.2
[INFO] [stderr]   Downloaded winapi-util v0.1.2
[INFO] [stderr]   Downloaded walkdir v2.2.9
[INFO] [stderr]   Downloaded criterion v0.2.11
[INFO] [stderr]   Downloaded crossbeam-utils v0.6.6
[INFO] [stderr]   Downloaded byte-mutator v0.1.1
[INFO] [stderr]   Downloaded crossbeam-channel v0.3.9
[INFO] [stderr]   Downloaded bitflags v1.1.0
[INFO] [stderr]   Downloaded cc v1.0.41
[INFO] [stderr]   Downloaded bstr v0.2.7
[INFO] [stderr]   Downloaded nix v0.14.1
[INFO] [stderr]   Downloaded fern v0.5.8
[INFO] [stderr]   Downloaded c2-chacha v0.2.2
[INFO] [stderr]   Downloaded libc v0.2.62
[INFO] [stderr]   Downloaded syn v1.0.5
[INFO] [stderr]   Downloaded time v0.1.42
[INFO] [stderr]   Downloaded chrono v0.4.7
[INFO] [stderr]   Downloaded iovec v0.1.2
[INFO] [stderr]   Downloaded num-integer v0.1.41
[INFO] [stderr]   Downloaded rand_xoshiro v0.1.0
[INFO] [stderr]   Downloaded nodrop v0.1.13
[INFO] [stderr]   Downloaded arrayvec v0.4.11
[INFO] [stderr]   Downloaded memoffset v0.5.1
[INFO] [stderr]   Downloaded crossbeam-epoch v0.7.2
[INFO] [stderr]   Downloaded crossbeam-deque v0.6.3
[INFO] [stderr]   Downloaded rayon-core v1.5.0
[INFO] [stderr]   Downloaded ryu v1.0.0
[INFO] [stderr]   Downloaded serde_json v1.0.40
[INFO] [stderr]   Downloaded same-file v1.0.5
[INFO] [stderr]   Downloaded ctrlc v3.1.3
[INFO] [stderr]   Downloaded futures-executor-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded futures-channel-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded futures-io-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded futures-core-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded futures-util-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded futures-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded futures-timer v0.3.0
[INFO] [stderr]   Downloaded num_cpus v1.10.1
[INFO] [stderr]   Downloaded ppv-lite86 v0.2.5
[INFO] [stderr]   Downloaded rand_chacha v0.2.1
[INFO] [stderr]   Downloaded cfg-if v0.1.9
[INFO] [stderr]   Downloaded wasi v0.5.0
[INFO] [stderr]   Downloaded quick-error v1.2.2
[INFO] [stderr]   Downloaded humantime v1.2.0
[INFO] [stderr]   Downloaded proc-macro2 v1.0.1
[INFO] [stderr]   Downloaded serde v1.0.102
[INFO] [stderr]   Downloaded toml v0.5.5
[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] 517157786de26833476b7c0bff818da2de940e6a44123a744c0a960a29579112
[INFO] running `Command { std: "docker" "start" "-a" "517157786de26833476b7c0bff818da2de940e6a44123a744c0a960a29579112", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "517157786de26833476b7c0bff818da2de940e6a44123a744c0a960a29579112", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "517157786de26833476b7c0bff818da2de940e6a44123a744c0a960a29579112", kill_on_drop: false }`
[INFO] [stdout] 517157786de26833476b7c0bff818da2de940e6a44123a744c0a960a29579112
[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] 2d7638fced318aac96ce05593a7a83c404aa728e245e77c1e91bc4f5cb32ee35
[INFO] running `Command { std: "docker" "start" "-a" "2d7638fced318aac96ce05593a7a83c404aa728e245e77c1e91bc4f5cb32ee35", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling serde v1.0.102
[INFO] [stderr]    Compiling autocfg v0.1.6
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling proc-macro2 v1.0.1
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking pin-utils v0.1.0-alpha.4
[INFO] [stderr]    Compiling arrayvec v0.4.11
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]    Compiling getrandom v0.1.11
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]    Compiling ryu v1.0.0
[INFO] [stderr]    Compiling nix v0.14.1
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]     Checking scopeguard v1.0.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.5
[INFO] [stderr]     Checking unicode-width v0.1.6
[INFO] [stderr]     Checking vec_map v0.8.1
[INFO] [stderr]     Checking itoa v0.4.4
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]     Checking either v1.5.2
[INFO] [stderr]    Compiling rayon-core v1.5.0
[INFO] [stderr]     Checking regex-automata v0.1.8
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]     Checking crossbeam-channel v0.3.9
[INFO] [stderr]     Checking async-task v1.0.0
[INFO] [stderr]     Checking arrayvec v0.5.1
[INFO] [stderr]    Compiling memoffset v0.5.1
[INFO] [stderr]     Checking quick-error v1.2.2
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking itertools v0.8.0
[INFO] [stderr]     Checking fern v0.5.8
[INFO] [stderr]     Checking spin_sleep v0.3.7
[INFO] [stderr]     Checking humantime v1.2.0
[INFO] [stderr]     Checking cast v0.2.2
[INFO] [stderr]     Checking same-file v1.0.5
[INFO] [stderr]     Checking rand_xoshiro v0.1.0
[INFO] [stderr]     Checking num_cpus v1.10.1
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking atty v0.2.13
[INFO] [stderr]     Checking time v0.1.42
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking walkdir v2.2.9
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking c2-chacha v0.2.2
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking mio v0.6.19
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking crossbeam-epoch v0.7.2
[INFO] [stderr]     Checking csv-core v0.1.6
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.0
[INFO] [stderr]     Checking criterion-plot v0.3.1
[INFO] [stderr]     Checking crossbeam-deque v0.6.3
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking chrono v0.4.7
[INFO] [stderr]     Checking rayon v1.1.0
[INFO] [stderr]     Checking futures-executor-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking futures-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking futures-timer v0.3.0
[INFO] [stderr]     Checking async-std v0.99.4
[INFO] [stderr]     Checking toml v0.5.5
[INFO] [stderr]     Checking bstr v0.2.7
[INFO] [stderr]     Checking serde_json v1.0.40
[INFO] [stderr]    Compiling serde_derive v1.0.102
[INFO] [stderr]     Checking ctrlc v3.1.3
[INFO] [stderr]     Checking csv v1.1.1
[INFO] [stderr]     Checking tinytemplate v1.0.2
[INFO] [stderr]     Checking byte-mutator v0.1.1
[INFO] [stderr]     Checking criterion v0.2.11
[INFO] [stderr]     Checking clobber v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `fern` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | use fern;
[INFO] [stdout]    |     ^^^^ the item `fern` 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: the item `humantime` is imported redundantly
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use humantime;
[INFO] [stdout]    |     ^^^^^^^^^ the item `humantime` 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: the item `humantime` is imported redundantly
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use humantime;
[INFO] [stdout]    |     ^^^^^^^^^ the item `humantime` 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 `fern` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | use fern;
[INFO] [stdout]    |     ^^^^ the item `fern` 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 18.75s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: criterion v0.2.11
[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" "2d7638fced318aac96ce05593a7a83c404aa728e245e77c1e91bc4f5cb32ee35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d7638fced318aac96ce05593a7a83c404aa728e245e77c1e91bc4f5cb32ee35", kill_on_drop: false }`
[INFO] [stdout] 2d7638fced318aac96ce05593a7a83c404aa728e245e77c1e91bc4f5cb32ee35