[INFO] fetching crate uflow 0.7.1...
[INFO] checking uflow-0.7.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate uflow 0.7.1 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate uflow 0.7.1 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 uflow 0.7.1
[INFO] finished tweaking crates.io crate uflow 0.7.1
[INFO] tweaked toml for crates.io crate uflow 0.7.1 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate crates.io crate uflow 0.7.1 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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] c903209ce5698740bf1fa73925b878b7a0c6cbdd4e81682d839ce8a36d2b0090
[INFO] running `Command { std: "docker" "start" "-a" "c903209ce5698740bf1fa73925b878b7a0c6cbdd4e81682d839ce8a36d2b0090", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c903209ce5698740bf1fa73925b878b7a0c6cbdd4e81682d839ce8a36d2b0090", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c903209ce5698740bf1fa73925b878b7a0c6cbdd4e81682d839ce8a36d2b0090", kill_on_drop: false }`
[INFO] [stdout] c903209ce5698740bf1fa73925b878b7a0c6cbdd4e81682d839ce8a36d2b0090
[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] 72cd4e850cc7c85a783e33c2ae79271c2ad4dc6a667bf690b97696591612715e
[INFO] running `Command { std: "docker" "start" "-a" "72cd4e850cc7c85a783e33c2ae79271c2ad4dc6a667bf690b97696591612715e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.102
[INFO] [stderr]     Checking md5 v0.7.0
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking uflow v0.7.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `MAX_FRAME_WINDOW_SIZE` is imported redundantly
[INFO] [stdout]    --> src/half_connection/emit.rs:219:9
[INFO] [stdout]     |
[INFO] [stdout] 216 |     use super::*;
[INFO] [stdout]     |         -------- the item `MAX_FRAME_WINDOW_SIZE` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 219 |     use crate::MAX_FRAME_WINDOW_SIZE;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]    --> src/half_connection/loss_rate.rs:114:9
[INFO] [stdout]     |
[INFO] [stdout] 114 |     use super::*;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `SendMode` is imported redundantly
[INFO] [stdout]    --> src/half_connection/mod.rs:445:9
[INFO] [stdout]     |
[INFO] [stdout] 443 |     use super::*;
[INFO] [stdout]     |         -------- the item `SendMode` is already imported here
[INFO] [stdout] 444 |
[INFO] [stdout] 445 |     use crate::SendMode;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.77s
[INFO] running `Command { std: "docker" "inspect" "72cd4e850cc7c85a783e33c2ae79271c2ad4dc6a667bf690b97696591612715e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "72cd4e850cc7c85a783e33c2ae79271c2ad4dc6a667bf690b97696591612715e", kill_on_drop: false }`
[INFO] [stdout] 72cd4e850cc7c85a783e33c2ae79271c2ad4dc6a667bf690b97696591612715e