[INFO] fetching crate s2png 0.11.1...
[INFO] checking s2png-0.11.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate s2png 0.11.1 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate s2png 0.11.1 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 s2png 0.11.1
[INFO] finished tweaking crates.io crate s2png 0.11.1
[INFO] tweaked toml for crates.io crate s2png 0.11.1 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate crates.io crate s2png 0.11.1 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]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded memoffset v0.5.4
[INFO] [stderr]   Downloaded ppv-lite86 v0.2.8
[INFO] [stderr]   Downloaded remove_dir_all v0.5.2
[INFO] [stderr]   Downloaded weezl v0.1.3
[INFO] [stderr]   Downloaded exitcode v1.1.2
[INFO] [stderr]   Downloaded hex v0.4.2
[INFO] [stderr]   Downloaded num-traits v0.2.11
[INFO] [stderr]   Downloaded file_diff v1.0.0
[INFO] [stderr]   Downloaded image v0.23.12
[INFO] [stderr]   Downloaded rayon v1.3.0
[INFO] [stderr]   Downloaded jpeg-decoder v0.1.19
[INFO] [stderr]   Downloaded deflate v0.8.4
[INFO] [stderr]   Downloaded rayon-core v1.7.0
[INFO] [stderr]   Downloaded bytemuck v1.2.0
[INFO] [stderr]   Downloaded tiff v0.6.0
[INFO] [stderr]   Downloaded gif v0.11.1
[INFO] [stderr]   Downloaded num-iter v0.1.40
[INFO] [stderr]   Downloaded num-integer v0.1.42
[INFO] [stderr]   Downloaded miniz_oxide v0.3.6
[INFO] [stderr]   Downloaded crossbeam-deque v0.7.3
[INFO] [stderr]   Downloaded crossbeam-queue v0.2.2
[INFO] [stderr]   Downloaded adler32 v1.0.4
[INFO] [stderr]   Downloaded tempfile v3.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 15f5a120fd2aa1c6ecc7ba07af3a288804918b787b2c39a0904f606422a09985
[INFO] running `Command { std: "docker" "start" "-a" "15f5a120fd2aa1c6ecc7ba07af3a288804918b787b2c39a0904f606422a09985", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "15f5a120fd2aa1c6ecc7ba07af3a288804918b787b2c39a0904f606422a09985", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15f5a120fd2aa1c6ecc7ba07af3a288804918b787b2c39a0904f606422a09985", kill_on_drop: false }`
[INFO] [stdout] 15f5a120fd2aa1c6ecc7ba07af3a288804918b787b2c39a0904f606422a09985
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] d17578ef16720d81acef45276412f044fa3dc7af3be7ebd46f9c7a96b466d068
[INFO] running `Command { std: "docker" "start" "-a" "d17578ef16720d81acef45276412f044fa3dc7af3be7ebd46f9c7a96b466d068", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]    Compiling rayon-core v1.7.0
[INFO] [stderr]     Checking either v1.5.3
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]     Checking adler32 v1.0.4
[INFO] [stderr]     Checking weezl v0.1.3
[INFO] [stderr]     Checking ppv-lite86 v0.2.8
[INFO] [stderr]     Checking unicode-width v0.1.7
[INFO] [stderr]     Checking bytemuck v1.2.0
[INFO] [stderr]     Checking hex v0.4.2
[INFO] [stderr]     Checking exitcode v1.1.2
[INFO] [stderr]     Checking aho-corasick v0.7.10
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking remove_dir_all v0.5.2
[INFO] [stderr]     Checking file_diff v1.0.0
[INFO] [stderr]     Checking miniz_oxide v0.3.6
[INFO] [stderr]     Checking deflate v0.8.4
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling memoffset v0.5.4
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]    Compiling miniz_oxide v0.4.3
[INFO] [stderr]    Compiling num-iter v0.1.40
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]     Checking gif v0.11.1
[INFO] [stderr]     Checking png v0.16.8
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking crossbeam-queue v0.2.2
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking rayon v1.3.0
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking jpeg-decoder v0.1.19
[INFO] [stderr]     Checking tiff v0.6.0
[INFO] [stderr]     Checking image v0.23.12
[INFO] [stderr]     Checking s2png v0.11.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/rc4/mod.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use hex;
[INFO] [stdout]   |     ^^^ the item `hex` 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 `hex` is imported redundantly
[INFO] [stdout]  --> src/rc4/mod.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use hex;
[INFO] [stdout]   |     ^^^ the item `hex` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `image` is imported redundantly
[INFO] [stdout]   --> src/main.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | use image;
[INFO] [stdout]    |     ^^^^^ the item `image` 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 `image` is imported redundantly
[INFO] [stdout]   --> src/main.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | use image;
[INFO] [stdout]    |     ^^^^^ the item `image` 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 `AsRef` is imported redundantly
[INFO] [stdout]  --> tests/integration.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     convert::AsRef,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `AsRef` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `IntoIterator` is imported redundantly
[INFO] [stdout]   --> tests/integration.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |         iter::IntoIterator,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `IntoIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `exitcode` is imported redundantly
[INFO] [stdout]   --> tests/integration.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     exitcode,
[INFO] [stdout]    |     ^^^^^^^^ the item `exitcode` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.20s
[INFO] running `Command { std: "docker" "inspect" "d17578ef16720d81acef45276412f044fa3dc7af3be7ebd46f9c7a96b466d068", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d17578ef16720d81acef45276412f044fa3dc7af3be7ebd46f9c7a96b466d068", kill_on_drop: false }`
[INFO] [stdout] d17578ef16720d81acef45276412f044fa3dc7af3be7ebd46f9c7a96b466d068