[INFO] fetching crate kstring 2.0.0...
[INFO] checking kstring-2.0.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate kstring 2.0.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate kstring 2.0.0 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 kstring 2.0.0
[INFO] finished tweaking crates.io crate kstring 2.0.0
[INFO] tweaked toml for crates.io crate kstring 2.0.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate crates.io crate kstring 2.0.0 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] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded criterion-plot v0.4.4
[INFO] [stderr]   Downloaded quote v1.0.17
[INFO] [stderr]   Downloaded document-features v0.2.1
[INFO] [stderr]   Downloaded semver v1.0.7
[INFO] [stderr]   Downloaded syn v1.0.90
[INFO] [stderr]   Downloaded criterion v0.3.5
[INFO] [stderr]   Downloaded libc v0.2.121
[INFO] [stderr]   Downloaded proptest v1.0.0
[INFO] [stderr]   Downloaded redox_syscall v0.2.12
[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] af5b6555a9b52fa3423784f0c42776dad0383c04c9eff08abf33069ca0c0298a
[INFO] running `Command { std: "docker" "start" "-a" "af5b6555a9b52fa3423784f0c42776dad0383c04c9eff08abf33069ca0c0298a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "af5b6555a9b52fa3423784f0c42776dad0383c04c9eff08abf33069ca0c0298a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af5b6555a9b52fa3423784f0c42776dad0383c04c9eff08abf33069ca0c0298a", kill_on_drop: false }`
[INFO] [stdout] af5b6555a9b52fa3423784f0c42776dad0383c04c9eff08abf33069ca0c0298a
[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] 391875677c43d2551b83f08b50dff693d5fabc4cef2edfffe8ddf2f756b19cb1
[INFO] running `Command { std: "docker" "start" "-a" "391875677c43d2551b83f08b50dff693d5fabc4cef2edfffe8ddf2f756b19cb1", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.121
[INFO] [stderr]    Compiling crossbeam-utils v0.8.8
[INFO] [stderr]    Compiling semver v1.0.7
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.8
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling syn v1.0.90
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]     Checking ppv-lite86 v0.2.16
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking plotters-backend v0.3.2
[INFO] [stderr]     Checking fastrand v1.7.0
[INFO] [stderr]     Checking plotters-svg v0.3.1
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking itoa v0.4.8
[INFO] [stderr]     Checking half v1.8.2
[INFO] [stderr]     Checking bit-vec v0.6.3
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]     Checking quick-error v2.0.1
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking kstring v2.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking bit-set v0.5.2
[INFO] [stderr]     Checking crossbeam-channel v0.5.4
[INFO] [stderr]    Compiling quote v1.0.17
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]     Checking getrandom v0.2.6
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking tempfile v3.3.0
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]    Compiling cast v0.2.7
[INFO] [stderr]     Checking rusty-fork v0.3.0
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking plotters v0.3.1
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand_xorshift v0.3.0
[INFO] [stderr]     Checking criterion-plot v0.4.4
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking regex v1.5.5
[INFO] [stderr]     Checking proptest v1.0.0
[INFO] [stderr]     Checking serde_json v1.0.79
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]     Checking csv v1.1.6
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]     Checking criterion v0.3.5
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 20.56s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: criterion v0.3.5
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "391875677c43d2551b83f08b50dff693d5fabc4cef2edfffe8ddf2f756b19cb1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "391875677c43d2551b83f08b50dff693d5fabc4cef2edfffe8ddf2f756b19cb1", kill_on_drop: false }`
[INFO] [stdout] 391875677c43d2551b83f08b50dff693d5fabc4cef2edfffe8ddf2f756b19cb1