[INFO] fetching crate nbd-async 0.6.0...
[INFO] checking nbd-async-0.6.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate nbd-async 0.6.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate nbd-async 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 nbd-async 0.6.0
[INFO] finished tweaking crates.io crate nbd-async 0.6.0
[INFO] tweaked toml for crates.io crate nbd-async 0.6.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate crates.io crate nbd-async 0.6.0 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] 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] 4a2bcd4fd2ecb608d593d6cf414aa26f0fe1015f7e20d5bd21798615500b0591
[INFO] running `Command { std: "docker" "start" "-a" "4a2bcd4fd2ecb608d593d6cf414aa26f0fe1015f7e20d5bd21798615500b0591", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4a2bcd4fd2ecb608d593d6cf414aa26f0fe1015f7e20d5bd21798615500b0591", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a2bcd4fd2ecb608d593d6cf414aa26f0fe1015f7e20d5bd21798615500b0591", kill_on_drop: false }`
[INFO] [stdout] 4a2bcd4fd2ecb608d593d6cf414aa26f0fe1015f7e20d5bd21798615500b0591
[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] 42019513736c5e63874363071886c0282a389f215c17db17ebeeb592bb09b8eb
[INFO] running `Command { std: "docker" "start" "-a" "42019513736c5e63874363071886c0282a389f215c17db17ebeeb592bb09b8eb", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling unicode-ident v1.0.1
[INFO] [stderr]    Compiling syn v1.0.96
[INFO] [stderr]    Compiling futures-task v0.3.21
[INFO] [stderr]    Compiling async-trait v0.1.56
[INFO] [stderr]    Compiling futures-util v0.3.21
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking socket2 v0.4.4
[INFO] [stderr]     Checking mio v0.8.3
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking nix v0.24.1
[INFO] [stderr]    Compiling tokio-macros v1.8.0
[INFO] [stderr]     Checking tokio v1.19.2
[INFO] [stderr]     Checking nbd-async v0.6.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `fua` and `no_hole` are never read
[INFO] [stdout]   --> src/nbd.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub struct RequestFlags {
[INFO] [stdout]    |            ------------ fields in this struct
[INFO] [stdout] 23 |     /// Force Unit Access flag.
[INFO] [stdout] 24 |     pub fua: bool,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 25 |     /// No Hole flag.
[INFO] [stdout] 26 |     pub no_hole: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `RequestFlags` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `fua` and `no_hole` are never read
[INFO] [stdout]   --> src/nbd.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub struct RequestFlags {
[INFO] [stdout]    |            ------------ fields in this struct
[INFO] [stdout] 23 |     /// Force Unit Access flag.
[INFO] [stdout] 24 |     pub fua: bool,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 25 |     /// No Hole flag.
[INFO] [stdout] 26 |     pub no_hole: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `RequestFlags` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `magic` and `flags` are never read
[INFO] [stdout]   --> src/nbd.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub struct Request {
[INFO] [stdout]    |            ------- fields in this struct
[INFO] [stdout] 31 |     pub magic: u32,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 32 |     pub command: Command,
[INFO] [stdout] 33 |     pub flags: RequestFlags,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Request` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `magic` and `flags` are never read
[INFO] [stdout]   --> src/nbd.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub struct Request {
[INFO] [stdout]    |            ------- fields in this struct
[INFO] [stdout] 31 |     pub magic: u32,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 32 |     pub command: Command,
[INFO] [stdout] 33 |     pub flags: RequestFlags,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Request` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[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 7.65s
[INFO] running `Command { std: "docker" "inspect" "42019513736c5e63874363071886c0282a389f215c17db17ebeeb592bb09b8eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "42019513736c5e63874363071886c0282a389f215c17db17ebeeb592bb09b8eb", kill_on_drop: false }`
[INFO] [stdout] 42019513736c5e63874363071886c0282a389f215c17db17ebeeb592bb09b8eb
[INFO] checking nbd-async-0.6.0 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate nbd-async 0.6.0 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate nbd-async 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 nbd-async 0.6.0
[INFO] finished tweaking crates.io crate nbd-async 0.6.0
[INFO] tweaked toml for crates.io crate nbd-async 0.6.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate crates.io crate nbd-async 0.6.0 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] [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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 04bde6577de494b418bd09fc594964bdd34550b5e44d56049972883cfaf0c2fd
[INFO] running `Command { std: "docker" "start" "-a" "04bde6577de494b418bd09fc594964bdd34550b5e44d56049972883cfaf0c2fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "04bde6577de494b418bd09fc594964bdd34550b5e44d56049972883cfaf0c2fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "04bde6577de494b418bd09fc594964bdd34550b5e44d56049972883cfaf0c2fd", kill_on_drop: false }`
[INFO] [stdout] 04bde6577de494b418bd09fc594964bdd34550b5e44d56049972883cfaf0c2fd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] f1dbeea738ef5b6f529808fd8079dcb1eaaba9a47f15cd20dfaf4f93326a02ba
[INFO] running `Command { std: "docker" "start" "-a" "f1dbeea738ef5b6f529808fd8079dcb1eaaba9a47f15cd20dfaf4f93326a02ba", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling unicode-ident v1.0.1
[INFO] [stderr]    Compiling syn v1.0.96
[INFO] [stderr]    Compiling futures-task v0.3.21
[INFO] [stderr]    Compiling futures-util v0.3.21
[INFO] [stderr]    Compiling async-trait v0.1.56
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking socket2 v0.4.4
[INFO] [stderr]     Checking mio v0.8.3
[INFO] [stderr]     Checking nix v0.24.1
[INFO] [stderr]    Compiling tokio-macros v1.8.0
[INFO] [stderr]     Checking tokio v1.19.2
[INFO] [stderr]     Checking nbd-async v0.6.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `fua` and `no_hole` are never read
[INFO] [stdout]   --> src/nbd.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub struct RequestFlags {
[INFO] [stdout]    |            ------------ fields in this struct
[INFO] [stdout] 23 |     /// Force Unit Access flag.
[INFO] [stdout] 24 |     pub fua: bool,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 25 |     /// No Hole flag.
[INFO] [stdout] 26 |     pub no_hole: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `RequestFlags` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `magic` and `flags` are never read
[INFO] [stdout]   --> src/nbd.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub struct Request {
[INFO] [stdout]    |            ------- fields in this struct
[INFO] [stdout] 31 |     pub magic: u32,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 32 |     pub command: Command,
[INFO] [stdout] 33 |     pub flags: RequestFlags,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Request` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `fua` and `no_hole` are never read
[INFO] [stdout]   --> src/nbd.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub struct RequestFlags {
[INFO] [stdout]    |            ------------ fields in this struct
[INFO] [stdout] 23 |     /// Force Unit Access flag.
[INFO] [stdout] 24 |     pub fua: bool,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 25 |     /// No Hole flag.
[INFO] [stdout] 26 |     pub no_hole: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `RequestFlags` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `magic` and `flags` are never read
[INFO] [stdout]   --> src/nbd.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub struct Request {
[INFO] [stdout]    |            ------- fields in this struct
[INFO] [stdout] 31 |     pub magic: u32,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 32 |     pub command: Command,
[INFO] [stdout] 33 |     pub flags: RequestFlags,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Request` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[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 9.07s
[INFO] running `Command { std: "docker" "inspect" "f1dbeea738ef5b6f529808fd8079dcb1eaaba9a47f15cd20dfaf4f93326a02ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f1dbeea738ef5b6f529808fd8079dcb1eaaba9a47f15cd20dfaf4f93326a02ba", kill_on_drop: false }`
[INFO] [stdout] f1dbeea738ef5b6f529808fd8079dcb1eaaba9a47f15cd20dfaf4f93326a02ba