[INFO] fetching crate tnb 0.1.2...
[INFO] checking tnb-0.1.2 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate tnb 0.1.2 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate tnb 0.1.2 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 tnb 0.1.2
[INFO] finished tweaking crates.io crate tnb 0.1.2
[INFO] tweaked toml for crates.io crate tnb 0.1.2 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate tnb 0.1.2 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]  Downloading crates ...
[INFO] [stderr]   Downloaded ordered-multimap v0.3.1
[INFO] [stderr]   Downloaded dlv-list v0.2.3
[INFO] [stderr]   Downloaded ahash v0.4.7
[INFO] [stderr]   Downloaded rust-ini v0.17.0
[INFO] [stderr]   Downloaded webpki-roots v0.22.1
[INFO] [stderr]   Downloaded serde v1.0.132
[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] 0a5b4c131ab4fe22da92985c2393d772e34ec4c31461465bd8eb8deb83261422
[INFO] running `Command { std: "docker" "start" "-a" "0a5b4c131ab4fe22da92985c2393d772e34ec4c31461465bd8eb8deb83261422", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0a5b4c131ab4fe22da92985c2393d772e34ec4c31461465bd8eb8deb83261422", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a5b4c131ab4fe22da92985c2393d772e34ec4c31461465bd8eb8deb83261422", kill_on_drop: false }`
[INFO] [stdout] 0a5b4c131ab4fe22da92985c2393d772e34ec4c31461465bd8eb8deb83261422
[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] f89bff4794e6240df8fe05f9ff280633c82d94e519fb6061ed0ef6c8d36ef94c
[INFO] running `Command { std: "docker" "start" "-a" "f89bff4794e6240df8fe05f9ff280633c82d94e519fb6061ed0ef6c8d36ef94c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.112
[INFO] [stderr]    Compiling cc v1.0.72
[INFO] [stderr]     Checking once_cell v1.9.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.15
[INFO] [stderr]    Compiling crc32fast v1.3.0
[INFO] [stderr]    Compiling serde v1.0.132
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking ahash v0.4.7
[INFO] [stderr]    Compiling serde_json v1.0.73
[INFO] [stderr]     Checking unicode-bidi v0.3.7
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]     Checking tinyvec v1.5.1
[INFO] [stderr]     Checking itoa v1.0.1
[INFO] [stderr]     Checking ryu v1.0.9
[INFO] [stderr]     Checking chunked_transfer v1.4.0
[INFO] [stderr]     Checking hashbrown v0.9.1
[INFO] [stderr]     Checking unicode-normalization v0.1.19
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking dirs-sys v0.3.6
[INFO] [stderr]     Checking flate2 v1.0.22
[INFO] [stderr]    Compiling ring v0.16.20
[INFO] [stderr]     Checking dirs v4.0.0
[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 idna v0.2.3
[INFO] [stderr]     Checking url v2.2.2
[INFO] [stderr]     Checking dlv-list v0.2.3
[INFO] [stderr]     Checking ordered-multimap v0.3.1
[INFO] [stderr]     Checking rust-ini v0.17.0
[INFO] [stderr]     Checking webpki v0.22.0
[INFO] [stderr]     Checking sct v0.7.0
[INFO] [stderr]     Checking webpki-roots v0.22.1
[INFO] [stderr]     Checking rustls v0.20.2
[INFO] [stderr]     Checking ureq v2.4.0
[INFO] [stderr]     Checking tnb v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `BufRead` is imported redundantly
[INFO] [stdout]   --> src/main.rs:7:21
[INFO] [stdout]    |
[INFO] [stdout] 7  | use std::io::{self, BufRead};
[INFO] [stdout]    |                     ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 14 | use std::io::prelude::*;
[INFO] [stdout]    |     ------------------- the item `BufRead` is already imported here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `BufRead` is imported redundantly
[INFO] [stdout]   --> src/main.rs:7:21
[INFO] [stdout]    |
[INFO] [stdout] 7  | use std::io::{self, BufRead};
[INFO] [stdout]    |                     ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 14 | use std::io::prelude::*;
[INFO] [stdout]    |     ------------------- the item `BufRead` is already imported here
[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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.42s
[INFO] running `Command { std: "docker" "inspect" "f89bff4794e6240df8fe05f9ff280633c82d94e519fb6061ed0ef6c8d36ef94c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f89bff4794e6240df8fe05f9ff280633c82d94e519fb6061ed0ef6c8d36ef94c", kill_on_drop: false }`
[INFO] [stdout] f89bff4794e6240df8fe05f9ff280633c82d94e519fb6061ed0ef6c8d36ef94c
[INFO] checking tnb-0.1.2 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate tnb 0.1.2 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate tnb 0.1.2 on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tnb 0.1.2
[INFO] finished tweaking crates.io crate tnb 0.1.2
[INFO] tweaked toml for crates.io crate tnb 0.1.2 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate crates.io crate tnb 0.1.2 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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ba9080da5699c8d07095b3fbfa4709aad9fc786424bb4ca72d65f22781500b91
[INFO] running `Command { std: "docker" "start" "-a" "ba9080da5699c8d07095b3fbfa4709aad9fc786424bb4ca72d65f22781500b91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ba9080da5699c8d07095b3fbfa4709aad9fc786424bb4ca72d65f22781500b91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ba9080da5699c8d07095b3fbfa4709aad9fc786424bb4ca72d65f22781500b91", kill_on_drop: false }`
[INFO] [stdout] ba9080da5699c8d07095b3fbfa4709aad9fc786424bb4ca72d65f22781500b91
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7b206bc8521b7fadce3f96d252b35f4e5d2e6c0212621301820f527f9eb3b696
[INFO] running `Command { std: "docker" "start" "-a" "7b206bc8521b7fadce3f96d252b35f4e5d2e6c0212621301820f527f9eb3b696", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.112
[INFO] [stderr]    Compiling cc v1.0.72
[INFO] [stderr]     Checking once_cell v1.9.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.15
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling crc32fast v1.3.0
[INFO] [stderr]    Compiling serde v1.0.132
[INFO] [stderr]    Compiling serde_json v1.0.73
[INFO] [stderr]     Checking ahash v0.4.7
[INFO] [stderr]     Checking tinyvec v1.5.1
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]     Checking unicode-bidi v0.3.7
[INFO] [stderr]     Checking ryu v1.0.9
[INFO] [stderr]     Checking itoa v1.0.1
[INFO] [stderr]     Checking chunked_transfer v1.4.0
[INFO] [stderr]     Checking hashbrown v0.9.1
[INFO] [stderr]    Compiling ring v0.16.20
[INFO] [stderr]     Checking unicode-normalization v0.1.19
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking flate2 v1.0.22
[INFO] [stderr]     Checking dirs-sys v0.3.6
[INFO] [stderr]     Checking dirs v4.0.0
[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 idna v0.2.3
[INFO] [stderr]     Checking dlv-list v0.2.3
[INFO] [stderr]     Checking url v2.2.2
[INFO] [stderr]     Checking ordered-multimap v0.3.1
[INFO] [stderr]     Checking rust-ini v0.17.0
[INFO] [stderr]     Checking webpki v0.22.0
[INFO] [stderr]     Checking sct v0.7.0
[INFO] [stderr]     Checking rustls v0.20.2
[INFO] [stderr]     Checking webpki-roots v0.22.1
[INFO] [stderr]     Checking ureq v2.4.0
[INFO] [stderr]     Checking tnb v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `BufRead` is imported redundantly
[INFO] [stdout]   --> src/main.rs:7:21
[INFO] [stdout]    |
[INFO] [stdout] 7  | use std::io::{self, BufRead};
[INFO] [stdout]    |                     ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 14 | use std::io::prelude::*;
[INFO] [stdout]    |     ------------------- the item `BufRead` is already imported here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `BufRead` is imported redundantly
[INFO] [stdout]   --> src/main.rs:7:21
[INFO] [stdout]    |
[INFO] [stdout] 7  | use std::io::{self, BufRead};
[INFO] [stdout]    |                     ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 14 | use std::io::prelude::*;
[INFO] [stdout]    |     ------------------- the item `BufRead` is already imported here
[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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.70s
[INFO] running `Command { std: "docker" "inspect" "7b206bc8521b7fadce3f96d252b35f4e5d2e6c0212621301820f527f9eb3b696", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b206bc8521b7fadce3f96d252b35f4e5d2e6c0212621301820f527f9eb3b696", kill_on_drop: false }`
[INFO] [stdout] 7b206bc8521b7fadce3f96d252b35f4e5d2e6c0212621301820f527f9eb3b696