[INFO] fetching crate alpkit 0.1.0-pre.2...
[INFO] checking alpkit-0.1.0-pre.2 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate alpkit 0.1.0-pre.2 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate alpkit 0.1.0-pre.2 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 alpkit 0.1.0-pre.2
[INFO] finished tweaking crates.io crate alpkit 0.1.0-pre.2
[INFO] tweaked toml for crates.io crate alpkit 0.1.0-pre.2 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 60 packages
[INFO] [stderr]       Adding base64 v0.13.1 (latest: v0.22.0)
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
[INFO] [stderr]       Adding darling v0.13.4 (latest: v0.20.8)
[INFO] [stderr]       Adding darling_core v0.13.4 (latest: v0.20.8)
[INFO] [stderr]       Adding darling_macro v0.13.4 (latest: v0.20.8)
[INFO] [stderr]       Adding indoc v1.0.9 (latest: v2.0.5)
[INFO] [stderr]       Adding redox_syscall v0.4.1 (latest: v0.5.1)
[INFO] [stderr]       Adding strsim v0.10.0 (latest: v0.11.1)
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.58)
[INFO] [stderr]       Adding yansi v0.5.1 (latest: v1.0.1)
[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 indoc v1.0.9
[INFO] [stderr]   Downloaded ident_case v1.0.1
[INFO] [stderr]   Downloaded darling_macro v0.13.4
[INFO] [stderr]   Downloaded cmake v0.1.50
[INFO] [stderr]   Downloaded bitmask-enum v2.2.3
[INFO] [stderr]   Downloaded yansi v0.5.1
[INFO] [stderr]   Downloaded assert2-macros v0.3.14
[INFO] [stderr]   Downloaded diff v0.1.13
[INFO] [stderr]   Downloaded is-terminal v0.4.12
[INFO] [stderr]   Downloaded cfg-iif v0.2.6
[INFO] [stderr]   Downloaded strsim v0.10.0
[INFO] [stderr]   Downloaded darling_core v0.13.4
[INFO] [stderr]   Downloaded signal-hook v0.3.17
[INFO] [stderr]   Downloaded assert2 v0.3.14
[INFO] [stderr]   Downloaded darling v0.13.4
[INFO] [stderr]   Downloaded process_control v4.1.0
[INFO] [stderr]   Downloaded field_names v0.2.0
[INFO] [stderr]   Downloaded libz-ng-sys v1.1.15
[INFO] [stderr]   Downloaded libz-sys v1.1.16
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] bf641b164f8640219f134060982421069b2aadf6043afec1e0eddf5ae962ca8a
[INFO] running `Command { std: "docker" "start" "-a" "bf641b164f8640219f134060982421069b2aadf6043afec1e0eddf5ae962ca8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bf641b164f8640219f134060982421069b2aadf6043afec1e0eddf5ae962ca8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bf641b164f8640219f134060982421069b2aadf6043afec1e0eddf5ae962ca8a", kill_on_drop: false }`
[INFO] [stdout] bf641b164f8640219f134060982421069b2aadf6043afec1e0eddf5ae962ca8a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] d947ea81090a385b4a62be45a53d3a7377d8cf71bcb0e472f4c453c7f2473b2f
[INFO] running `Command { std: "docker" "start" "-a" "d947ea81090a385b4a62be45a53d3a7377d8cf71bcb0e472f4c453c7f2473b2f", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling semver v1.0.22
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]    Compiling crc32fast v1.4.0
[INFO] [stderr]    Compiling serde v1.0.197
[INFO] [stderr]    Compiling serde_derive v1.0.197
[INFO] [stderr]    Compiling thiserror v1.0.58
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking miniz_oxide v0.7.2
[INFO] [stderr]     Checking filetime v0.2.23
[INFO] [stderr]    Compiling thiserror-impl v1.0.58
[INFO] [stderr]    Compiling serde_json v1.0.115
[INFO] [stderr]    Compiling bitmask-enum v2.2.3
[INFO] [stderr]     Checking tar v0.4.40
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]     Checking flate2 v1.0.28
[INFO] [stderr]     Checking is-terminal v0.4.12
[INFO] [stderr]     Checking ryu v1.0.17
[INFO] [stderr]     Checking diff v0.1.13
[INFO] [stderr]     Checking itoa v1.0.11
[INFO] [stderr]     Checking cfg-iif v0.2.6
[INFO] [stderr]    Compiling assert2-macros v0.3.14
[INFO] [stderr]     Checking yansi v0.5.1
[INFO] [stderr]    Compiling indoc v1.0.9
[INFO] [stderr]    Compiling darling_core v0.13.4
[INFO] [stderr]     Checking assert2 v0.3.14
[INFO] [stderr]    Compiling darling_macro v0.13.4
[INFO] [stderr]    Compiling darling v0.13.4
[INFO] [stderr]    Compiling field_names v0.2.0
[INFO] [stderr]     Checking alpkit v0.1.0-pre.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `serde` is imported redundantly
[INFO] [stdout]  --> src/package/pkginfo.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 | use serde::{self, Deserialize, Serialize};
[INFO] [stdout]   |             ^^^^ the item `serde` 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 `serde` is imported redundantly
[INFO] [stdout]  --> src/package/pkginfo.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 | use serde::{self, Deserialize, Serialize};
[INFO] [stdout]   |             ^^^^ the item `serde` 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 `FileType` is imported redundantly
[INFO] [stdout]  --> src/package/mod.test.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use super::*;
[INFO] [stdout]   |     -------- the item `FileType` is already imported here
[INFO] [stdout] 6 | use crate::internal::test_utils::{assert, assert_let, dependency, S};
[INFO] [stdout] 7 | use fileinfo::FileType;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `tap_mut` and `pipe_if` are never used
[INFO] [stdout]   --> src/internal/std_ext.rs:50:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub(crate) trait Tap: Sized {
[INFO] [stdout]    |                  --- methods in this trait
[INFO] [stdout] ...
[INFO] [stdout] 50 |     fn tap_mut<F: FnOnce(&mut Self)>(mut self, f: F) -> Self {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 66 |     fn pipe_if<F: FnOnce(Self) -> Self>(self, cond: bool, f: F) -> Self {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 27.31s
[INFO] running `Command { std: "docker" "inspect" "d947ea81090a385b4a62be45a53d3a7377d8cf71bcb0e472f4c453c7f2473b2f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d947ea81090a385b4a62be45a53d3a7377d8cf71bcb0e472f4c453c7f2473b2f", kill_on_drop: false }`
[INFO] [stdout] d947ea81090a385b4a62be45a53d3a7377d8cf71bcb0e472f4c453c7f2473b2f