[INFO] cloning repository https://github.com/mbazzani/huffman_conjectures
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mbazzani/huffman_conjectures" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmbazzani%2Fhuffman_conjectures", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmbazzani%2Fhuffman_conjectures'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3d9f85a4c619abf3cdb7b799860d6583f8355c17
[INFO] checking mbazzani/huffman_conjectures against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmbazzani%2Fhuffman_conjectures" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mbazzani/huffman_conjectures 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] removed /workspace/builds/worker-6-tc1/source/.cargo/config
[INFO] started tweaking git repo https://github.com/mbazzani/huffman_conjectures
[INFO] finished tweaking git repo https://github.com/mbazzani/huffman_conjectures
[INFO] tweaked toml for git repo https://github.com/mbazzani/huffman_conjectures written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/mbazzani/huffman_conjectures 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]  Downloading crates ...
[INFO] [stderr]   Downloaded sorted-vec v0.8.2
[INFO] [stderr]   Downloaded xxhash-rust v0.8.6
[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] e853464255d4bddf41a0f6eeb9c27f18a0533982591f2a619bc067df7befbb1a
[INFO] running `Command { std: "docker" "start" "-a" "e853464255d4bddf41a0f6eeb9c27f18a0533982591f2a619bc067df7befbb1a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e853464255d4bddf41a0f6eeb9c27f18a0533982591f2a619bc067df7befbb1a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e853464255d4bddf41a0f6eeb9c27f18a0533982591f2a619bc067df7befbb1a", kill_on_drop: false }`
[INFO] [stdout] e853464255d4bddf41a0f6eeb9c27f18a0533982591f2a619bc067df7befbb1a
[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] 5915065deb08e3b733c6ffdf822a45305dcaa092c90141f7236546f61c4c9fa5
[INFO] running `Command { std: "docker" "start" "-a" "5915065deb08e3b733c6ffdf822a45305dcaa092c90141f7236546f61c4c9fa5", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling libc v0.2.147
[INFO] [stderr]    Compiling crossbeam-utils v0.8.16
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]    Compiling rayon-core v1.11.0
[INFO] [stderr]     Checking either v1.9.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling serde v1.0.188
[INFO] [stderr]     Checking xxhash-rust v0.8.6
[INFO] [stderr]     Checking rustc-hash v1.1.0
[INFO] [stderr]     Checking sorted-vec v0.8.2
[INFO] [stderr]     Checking itertools v0.11.0
[INFO] [stderr]    Compiling num-traits v0.2.16
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling memoffset v0.9.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.15
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling num-rational v0.4.1
[INFO] [stderr]     Checking crossbeam-channel v0.5.8
[INFO] [stderr]     Checking getrandom v0.2.10
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking crossbeam-deque v0.8.3
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking rayon v1.7.0
[INFO] [stderr]     Checking num-complex v0.4.4
[INFO] [stderr]     Checking num v0.4.1
[INFO] [stderr]     Checking competitive_optimality v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Node` is imported redundantly
[INFO] [stdout]    --> src/conjectures.rs:187:9
[INFO] [stdout]     |
[INFO] [stdout] 186 |     use super::*;
[INFO] [stdout]     |         -------- the item `Node` is already imported here
[INFO] [stdout] 187 |     use crate::node::Node;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Node` is imported redundantly
[INFO] [stdout]    --> src/source.rs:100:9
[INFO] [stdout]     |
[INFO] [stdout] 99  |     use super::*;
[INFO] [stdout]     |         -------- the item `Node` is already imported here
[INFO] [stdout] 100 |     use crate::node::Node;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `loses` is never used
[INFO] [stdout]   --> src/code.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub trait CompetitiveOrd {
[INFO] [stdout]    |           -------------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 35 |     fn loses(&self, other: &Self) -> Option<bool>;
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/code.rs:63:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | pub trait New {
[INFO] [stdout]    |           --- associated function in this trait
[INFO] [stdout] 63 |     fn new() -> Self;
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `loses` is never used
[INFO] [stdout]   --> src/code.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub trait CompetitiveOrd {
[INFO] [stdout]    |           -------------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 35 |     fn loses(&self, other: &Self) -> Option<bool>;
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [optimized + debuginfo] target(s) in 9.08s
[INFO] running `Command { std: "docker" "inspect" "5915065deb08e3b733c6ffdf822a45305dcaa092c90141f7236546f61c4c9fa5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5915065deb08e3b733c6ffdf822a45305dcaa092c90141f7236546f61c4c9fa5", kill_on_drop: false }`
[INFO] [stdout] 5915065deb08e3b733c6ffdf822a45305dcaa092c90141f7236546f61c4c9fa5