[INFO] fetching crate pancakestack 0.6.0...
[INFO] checking pancakestack-0.6.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate pancakestack 0.6.0 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate pancakestack 0.6.0 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 pancakestack 0.6.0
[INFO] finished tweaking crates.io crate pancakestack 0.6.0
[INFO] tweaked toml for crates.io crate pancakestack 0.6.0 written to /workspace/builds/worker-5-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 74 packages
[INFO] [stderr]       Adding anes v0.1.6 (latest: v0.2.0)
[INFO] [stderr]       Adding itertools v0.10.5 (latest: v0.12.1)
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 82f1f0748bb5448c6d68a02fc255bc2e0651b41eb9ee90775527e0606f2ff8d5
[INFO] running `Command { std: "docker" "start" "-a" "82f1f0748bb5448c6d68a02fc255bc2e0651b41eb9ee90775527e0606f2ff8d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "82f1f0748bb5448c6d68a02fc255bc2e0651b41eb9ee90775527e0606f2ff8d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "82f1f0748bb5448c6d68a02fc255bc2e0651b41eb9ee90775527e0606f2ff8d5", kill_on_drop: false }`
[INFO] [stdout] 82f1f0748bb5448c6d68a02fc255bc2e0651b41eb9ee90775527e0606f2ff8d5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 2b626c8b9dde40a6fbb1eb676a231a3acbcd6b0bc91ce99d16ab27a92cc8fb2c
[INFO] running `Command { std: "docker" "start" "-a" "2b626c8b9dde40a6fbb1eb676a231a3acbcd6b0bc91ce99d16ab27a92cc8fb2c", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.7.2
[INFO] [stderr]    Compiling regex-syntax v0.8.3
[INFO] [stderr]     Checking aho-corasick v1.1.3
[INFO] [stderr]     Checking unicode-segmentation v1.11.0
[INFO] [stderr]     Checking is-terminal v0.4.12
[INFO] [stderr]     Checking plotters v0.3.5
[INFO] [stderr]     Checking regex-automata v0.4.6
[INFO] [stderr]     Checking regex v1.10.4
[INFO] [stderr]     Checking criterion v0.5.1
[INFO] [stderr]    Compiling lazy-regex-proc_macros v3.1.0
[INFO] [stderr]     Checking lazy-regex v3.1.0
[INFO] [stderr]     Checking pancakestack v0.6.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Read` is imported redundantly
[INFO] [stdout]  --> src/interpret.rs:4:44
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io::{self, prelude::*, BufReader, Read, Write};
[INFO] [stdout]   |                     ----------             ^^^^
[INFO] [stdout]   |                     |
[INFO] [stdout]   |                     the item `Read` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Write` is imported redundantly
[INFO] [stdout]  --> src/interpret.rs:4:50
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io::{self, prelude::*, BufReader, Read, Write};
[INFO] [stdout]   |                     ----------                   ^^^^^
[INFO] [stdout]   |                     |
[INFO] [stdout]   |                     the item `Write` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Read` is imported redundantly
[INFO] [stdout]  --> src/interpret.rs:4:44
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io::{self, prelude::*, BufReader, Read, Write};
[INFO] [stdout]   |                     ----------             ^^^^
[INFO] [stdout]   |                     |
[INFO] [stdout]   |                     the item `Read` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Write` is imported redundantly
[INFO] [stdout]  --> src/interpret.rs:4:50
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io::{self, prelude::*, BufReader, Read, Write};
[INFO] [stdout]   |                     ----------                   ^^^^^
[INFO] [stdout]   |                     |
[INFO] [stdout]   |                     the item `Write` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.85s
[INFO] running `Command { std: "docker" "inspect" "2b626c8b9dde40a6fbb1eb676a231a3acbcd6b0bc91ce99d16ab27a92cc8fb2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b626c8b9dde40a6fbb1eb676a231a3acbcd6b0bc91ce99d16ab27a92cc8fb2c", kill_on_drop: false }`
[INFO] [stdout] 2b626c8b9dde40a6fbb1eb676a231a3acbcd6b0bc91ce99d16ab27a92cc8fb2c
[INFO] checking pancakestack-0.6.0 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate pancakestack 0.6.0 into /workspace/builds/worker-5-tc2/source
[INFO] validating manifest of crates.io crate pancakestack 0.6.0 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 pancakestack 0.6.0
[INFO] finished tweaking crates.io crate pancakestack 0.6.0
[INFO] tweaked toml for crates.io crate pancakestack 0.6.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] a62e7f12dc8310063f61203a34491087265a019fa213d9cab0d57f7280eb0b92
[INFO] running `Command { std: "docker" "start" "-a" "a62e7f12dc8310063f61203a34491087265a019fa213d9cab0d57f7280eb0b92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a62e7f12dc8310063f61203a34491087265a019fa213d9cab0d57f7280eb0b92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a62e7f12dc8310063f61203a34491087265a019fa213d9cab0d57f7280eb0b92", kill_on_drop: false }`
[INFO] [stdout] a62e7f12dc8310063f61203a34491087265a019fa213d9cab0d57f7280eb0b92
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 18fef0dc40e609ad0c7006c9abfcc66cc5a9e7ae98635897cf34be3f88d3be51
[INFO] running `Command { std: "docker" "start" "-a" "18fef0dc40e609ad0c7006c9abfcc66cc5a9e7ae98635897cf34be3f88d3be51", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.7.2
[INFO] [stderr]    Compiling regex-syntax v0.8.3
[INFO] [stderr]     Checking aho-corasick v1.1.3
[INFO] [stderr]     Checking unicode-segmentation v1.11.0
[INFO] [stderr]     Checking is-terminal v0.4.12
[INFO] [stderr]     Checking plotters v0.3.5
[INFO] [stderr]     Checking regex-automata v0.4.6
[INFO] [stderr]     Checking regex v1.10.4
[INFO] [stderr]     Checking criterion v0.5.1
[INFO] [stderr]    Compiling lazy-regex-proc_macros v3.1.0
[INFO] [stderr]     Checking lazy-regex v3.1.0
[INFO] [stderr]     Checking pancakestack v0.6.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Read` is imported redundantly
[INFO] [stdout]  --> src/interpret.rs:4:44
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io::{self, prelude::*, BufReader, Read, Write};
[INFO] [stdout]   |                     ----------             ^^^^
[INFO] [stdout]   |                     |
[INFO] [stdout]   |                     the item `Read` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Write` is imported redundantly
[INFO] [stdout]  --> src/interpret.rs:4:50
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io::{self, prelude::*, BufReader, Read, Write};
[INFO] [stdout]   |                     ----------                   ^^^^^
[INFO] [stdout]   |                     |
[INFO] [stdout]   |                     the item `Write` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Read` is imported redundantly
[INFO] [stdout]  --> src/interpret.rs:4:44
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io::{self, prelude::*, BufReader, Read, Write};
[INFO] [stdout]   |                     ----------             ^^^^
[INFO] [stdout]   |                     |
[INFO] [stdout]   |                     the item `Read` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Write` is imported redundantly
[INFO] [stdout]  --> src/interpret.rs:4:50
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io::{self, prelude::*, BufReader, Read, Write};
[INFO] [stdout]   |                     ----------                   ^^^^^
[INFO] [stdout]   |                     |
[INFO] [stdout]   |                     the item `Write` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.58s
[INFO] running `Command { std: "docker" "inspect" "18fef0dc40e609ad0c7006c9abfcc66cc5a9e7ae98635897cf34be3f88d3be51", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18fef0dc40e609ad0c7006c9abfcc66cc5a9e7ae98635897cf34be3f88d3be51", kill_on_drop: false }`
[INFO] [stdout] 18fef0dc40e609ad0c7006c9abfcc66cc5a9e7ae98635897cf34be3f88d3be51