[INFO] fetching crate sprout 1.0.0...
[INFO] checking sprout-1.0.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate sprout 1.0.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate sprout 1.0.0 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 sprout 1.0.0
[INFO] finished tweaking crates.io crate sprout 1.0.0
[INFO] tweaked toml for crates.io crate sprout 1.0.0 written to /workspace/builds/worker-6-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 18 packages
[INFO] [stderr]       Adding fixedbitset v0.4.2 (latest: v0.5.6)
[INFO] [stderr]       Adding windows-sys v0.48.0 (latest: v0.52.0)
[INFO] [stderr]       Adding windows-targets v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_aarch64_gnullvm v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_aarch64_msvc v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_i686_gnu v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_i686_msvc v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_gnu v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_gnullvm v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_msvc v0.48.5 (latest: v0.52.4)
[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 trees v0.4.2
[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] 321c7a0c0d90f8fa90562d367f28b89a5ec6b68accb5aa6827e8438be5e887e4
[INFO] running `Command { std: "docker" "start" "-a" "321c7a0c0d90f8fa90562d367f28b89a5ec6b68accb5aa6827e8438be5e887e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "321c7a0c0d90f8fa90562d367f28b89a5ec6b68accb5aa6827e8438be5e887e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "321c7a0c0d90f8fa90562d367f28b89a5ec6b68accb5aa6827e8438be5e887e4", kill_on_drop: false }`
[INFO] [stdout] 321c7a0c0d90f8fa90562d367f28b89a5ec6b68accb5aa6827e8438be5e887e4
[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] eef90958cf6a2b54fbc83e79ed38bb2b4181721cd48222952d44b7c3bb07dae6
[INFO] running `Command { std: "docker" "start" "-a" "eef90958cf6a2b54fbc83e79ed38bb2b4181721cd48222952d44b7c3bb07dae6", kill_on_drop: false }`
[INFO] [stderr]     Checking fixedbitset v0.4.2
[INFO] [stderr]     Checking trees v0.4.2
[INFO] [stderr]     Checking colored v2.1.0
[INFO] [stderr]     Checking petgraph v0.6.4
[INFO] [stderr]     Checking sprout v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `MatchResult` is imported redundantly
[INFO] [stdout]    --> src/token_match.rs:255:9
[INFO] [stdout]     |
[INFO] [stdout] 255 |     use crate::compare::MatchResult;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 256 |
[INFO] [stdout] 257 |     use super::*;
[INFO] [stdout]     |         -------- the item `MatchResult` is already imported here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Matcher` is imported redundantly
[INFO] [stdout]    --> src/compare/match_graph_builder.rs:145:26
[INFO] [stdout]     |
[INFO] [stdout] 145 |     use crate::compare::{Matcher, SequenceView, MatchError, MatcherContext, MatchResult};
[INFO] [stdout]     |                          ^^^^^^^
[INFO] [stdout] 146 |
[INFO] [stdout] 147 |     use super::*;
[INFO] [stdout]     |         -------- the item `Matcher` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Token` is imported redundantly
[INFO] [stdout]    --> src/parse/grammar.rs:441:17
[INFO] [stdout]     |
[INFO] [stdout] 441 |     use crate::{tokenize::Token, grammar};
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^
[INFO] [stdout] 442 |
[INFO] [stdout] 443 |     use super::*;
[INFO] [stdout]     |         -------- the item `Token` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.17s
[INFO] running `Command { std: "docker" "inspect" "eef90958cf6a2b54fbc83e79ed38bb2b4181721cd48222952d44b7c3bb07dae6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eef90958cf6a2b54fbc83e79ed38bb2b4181721cd48222952d44b7c3bb07dae6", kill_on_drop: false }`
[INFO] [stdout] eef90958cf6a2b54fbc83e79ed38bb2b4181721cd48222952d44b7c3bb07dae6