[INFO] fetching crate assemblylift-iomod-dynamodb-guest 0.1.7...
[INFO] checking assemblylift-iomod-dynamodb-guest-0.1.7 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate assemblylift-iomod-dynamodb-guest 0.1.7 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate assemblylift-iomod-dynamodb-guest 0.1.7 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 assemblylift-iomod-dynamodb-guest 0.1.7
[INFO] finished tweaking crates.io crate assemblylift-iomod-dynamodb-guest 0.1.7
[INFO] tweaked toml for crates.io crate assemblylift-iomod-dynamodb-guest 0.1.7 written to /workspace/builds/worker-2-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 30 packages
[INFO] [stderr]       Adding base64 v0.12.3 (latest: v0.22.0)
[INFO] [stderr]       Adding bytes v0.5.6 (latest: v1.6.0)
[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 assemblylift-core-iomod-guest v0.3.0
[INFO] [stderr]   Downloaded assemblylift-core-io-guest v0.3.2
[INFO] [stderr]   Downloaded assemblylift-core-io-common v0.3.0
[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] 9be4f01b2a1f3ad4726246eca8d32be30ef62885d972fedcaa8b6ffca466f830
[INFO] running `Command { std: "docker" "start" "-a" "9be4f01b2a1f3ad4726246eca8d32be30ef62885d972fedcaa8b6ffca466f830", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9be4f01b2a1f3ad4726246eca8d32be30ef62885d972fedcaa8b6ffca466f830", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9be4f01b2a1f3ad4726246eca8d32be30ef62885d972fedcaa8b6ffca466f830", kill_on_drop: false }`
[INFO] [stdout] 9be4f01b2a1f3ad4726246eca8d32be30ef62885d972fedcaa8b6ffca466f830
[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] b50811103d00d0aeaf414715557e2a58b8cd77b9acf336784ea20e50d23bec42
[INFO] running `Command { std: "docker" "start" "-a" "b50811103d00d0aeaf414715557e2a58b8cd77b9acf336784ea20e50d23bec42", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-core v0.3.30
[INFO] [stderr]    Compiling serde_json v1.0.115
[INFO] [stderr]     Checking ryu v1.0.17
[INFO] [stderr]     Checking base64 v0.12.3
[INFO] [stderr]     Checking bytes v0.5.6
[INFO] [stderr]     Checking assemblylift-core-iomod-guest v0.3.0
[INFO] [stderr]    Compiling syn v2.0.58
[INFO] [stderr]     Checking futures-channel v0.3.30
[INFO] [stderr]    Compiling serde_derive v1.0.197
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking serde v1.0.197
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking futures v0.3.30
[INFO] [stderr]     Checking assemblylift-core-io-common v0.3.0
[INFO] [stderr]     Checking assemblylift-core-io-guest v0.3.2
[INFO] [stderr]     Checking assemblylift-iomod-dynamodb-guest v0.1.7 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `base64` is imported redundantly
[INFO] [stdout]  --> src/serialization.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use base64;
[INFO] [stdout]   |     ^^^^^^ the item `base64` 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 `base64` is imported redundantly
[INFO] [stdout]  --> src/serialization.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use base64;
[INFO] [stdout]   |     ^^^^^^ the item `base64` 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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 23.25s
[INFO] running `Command { std: "docker" "inspect" "b50811103d00d0aeaf414715557e2a58b8cd77b9acf336784ea20e50d23bec42", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b50811103d00d0aeaf414715557e2a58b8cd77b9acf336784ea20e50d23bec42", kill_on_drop: false }`
[INFO] [stdout] b50811103d00d0aeaf414715557e2a58b8cd77b9acf336784ea20e50d23bec42
[INFO] checking assemblylift-iomod-dynamodb-guest-0.1.7 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate assemblylift-iomod-dynamodb-guest 0.1.7 into /workspace/builds/worker-2-tc2/source
[INFO] validating manifest of crates.io crate assemblylift-iomod-dynamodb-guest 0.1.7 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 assemblylift-iomod-dynamodb-guest 0.1.7
[INFO] finished tweaking crates.io crate assemblylift-iomod-dynamodb-guest 0.1.7
[INFO] tweaked toml for crates.io crate assemblylift-iomod-dynamodb-guest 0.1.7 written to /workspace/builds/worker-2-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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 13795a2a617899380e32be20a36134c39cedbcef61bbbd96e48144c8e8e31858
[INFO] running `Command { std: "docker" "start" "-a" "13795a2a617899380e32be20a36134c39cedbcef61bbbd96e48144c8e8e31858", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "13795a2a617899380e32be20a36134c39cedbcef61bbbd96e48144c8e8e31858", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "13795a2a617899380e32be20a36134c39cedbcef61bbbd96e48144c8e8e31858", kill_on_drop: false }`
[INFO] [stdout] 13795a2a617899380e32be20a36134c39cedbcef61bbbd96e48144c8e8e31858
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 87e671436d81209ed65d0d5833103a23abc3d20bbda736ce8b914bfd7fdaeafc
[INFO] running `Command { std: "docker" "start" "-a" "87e671436d81209ed65d0d5833103a23abc3d20bbda736ce8b914bfd7fdaeafc", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-core v0.3.30
[INFO] [stderr]    Compiling serde_json v1.0.115
[INFO] [stderr]     Checking ryu v1.0.17
[INFO] [stderr]     Checking base64 v0.12.3
[INFO] [stderr]     Checking bytes v0.5.6
[INFO] [stderr]     Checking assemblylift-core-iomod-guest v0.3.0
[INFO] [stderr]    Compiling syn v2.0.58
[INFO] [stderr]     Checking futures-channel v0.3.30
[INFO] [stderr]    Compiling serde_derive v1.0.197
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking serde v1.0.197
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking futures v0.3.30
[INFO] [stderr]     Checking assemblylift-core-io-common v0.3.0
[INFO] [stderr]     Checking assemblylift-core-io-guest v0.3.2
[INFO] [stderr]     Checking assemblylift-iomod-dynamodb-guest v0.1.7 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `base64` is imported redundantly
[INFO] [stdout]  --> src/serialization.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use base64;
[INFO] [stdout]   |     ^^^^^^ the item `base64` 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 `base64` is imported redundantly
[INFO] [stdout]  --> src/serialization.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use base64;
[INFO] [stdout]   |     ^^^^^^ the item `base64` 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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 22.48s
[INFO] running `Command { std: "docker" "inspect" "87e671436d81209ed65d0d5833103a23abc3d20bbda736ce8b914bfd7fdaeafc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87e671436d81209ed65d0d5833103a23abc3d20bbda736ce8b914bfd7fdaeafc", kill_on_drop: false }`
[INFO] [stdout] 87e671436d81209ed65d0d5833103a23abc3d20bbda736ce8b914bfd7fdaeafc