[INFO] fetching crate tether-agent 0.12.1...
[INFO] checking tether-agent-0.12.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate tether-agent 0.12.1 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate tether-agent 0.12.1 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 tether-agent 0.12.1
[INFO] finished tweaking crates.io crate tether-agent 0.12.1
[INFO] tweaked toml for crates.io crate tether-agent 0.12.1 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate crates.io crate tether-agent 0.12.1 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]  Downloading crates ...
[INFO] [stderr]   Downloaded paste v1.0.12
[INFO] [stderr]   Downloaded async-channel v1.8.0
[INFO] [stderr]   Downloaded rmp-serde v1.1.1
[INFO] [stderr]   Downloaded paho-mqtt v0.12.1
[INFO] [stderr]   Downloaded paho-mqtt-sys v0.8.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 1a5abf5230a03f12e9fdf6266b3371d58fbb4de480d087906dcd2be36faa6e48
[INFO] running `Command { std: "docker" "start" "-a" "1a5abf5230a03f12e9fdf6266b3371d58fbb4de480d087906dcd2be36faa6e48", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1a5abf5230a03f12e9fdf6266b3371d58fbb4de480d087906dcd2be36faa6e48", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1a5abf5230a03f12e9fdf6266b3371d58fbb4de480d087906dcd2be36faa6e48", kill_on_drop: false }`
[INFO] [stdout] 1a5abf5230a03f12e9fdf6266b3371d58fbb4de480d087906dcd2be36faa6e48
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 50e2e643cbc6afabf448da4d1be09119de81dec8d21df8cf39ac13a10b23a123
[INFO] running `Command { std: "docker" "start" "-a" "50e2e643cbc6afabf448da4d1be09119de81dec8d21df8cf39ac13a10b23a123", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.63
[INFO] [stderr]    Compiling unicode-ident v1.0.9
[INFO] [stderr]    Compiling quote v1.0.28
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling futures-core v0.3.28
[INFO] [stderr]    Compiling futures-channel v0.3.28
[INFO] [stderr]    Compiling futures-task v0.3.28
[INFO] [stderr]    Compiling crossbeam-utils v0.8.16
[INFO] [stderr]     Checking futures-sink v0.3.28
[INFO] [stderr]    Compiling libc v0.2.147
[INFO] [stderr]    Compiling cc v1.0.79
[INFO] [stderr]    Compiling futures-util v0.3.28
[INFO] [stderr]     Checking pin-project-lite v0.2.9
[INFO] [stderr]    Compiling slab v0.4.8
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]     Checking futures-io v0.3.28
[INFO] [stderr]    Compiling serde v1.0.164
[INFO] [stderr]    Compiling paste v1.0.12
[INFO] [stderr]    Compiling thiserror v1.0.40
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking log v0.4.19
[INFO] [stderr]    Compiling serde_json v1.0.99
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]    Compiling anyhow v1.0.71
[INFO] [stderr]     Checking regex-syntax v0.7.2
[INFO] [stderr]     Checking event-listener v2.5.3
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]    Compiling cmake v0.1.50
[INFO] [stderr]     Checking itoa v1.0.6
[INFO] [stderr]     Checking termcolor v1.2.0
[INFO] [stderr]     Checking futures-timer v3.0.2
[INFO] [stderr]     Checking aho-corasick v1.0.2
[INFO] [stderr]     Checking ryu v1.0.13
[INFO] [stderr]     Checking concurrent-queue v2.2.0
[INFO] [stderr]     Checking crossbeam-channel v0.5.8
[INFO] [stderr]     Checking async-channel v1.8.0
[INFO] [stderr]    Compiling syn v2.0.22
[INFO] [stderr]    Compiling paho-mqtt-sys v0.8.1
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking rmp v0.8.11
[INFO] [stderr]     Checking regex v1.8.4
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]    Compiling futures-macro v0.3.28
[INFO] [stderr]    Compiling serde_derive v1.0.164
[INFO] [stderr]    Compiling thiserror-impl v1.0.40
[INFO] [stderr]     Checking futures-executor v0.3.28
[INFO] [stderr]     Checking futures v0.3.28
[INFO] [stderr]     Checking paho-mqtt v0.12.1
[INFO] [stderr]     Checking rmp-serde v1.1.1
[INFO] [stderr]     Checking tether-agent v0.12.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `CustomStruct` is never constructed
[INFO] [stdout]  --> examples/error_handling.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct CustomStruct {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.39s
[INFO] running `Command { std: "docker" "inspect" "50e2e643cbc6afabf448da4d1be09119de81dec8d21df8cf39ac13a10b23a123", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50e2e643cbc6afabf448da4d1be09119de81dec8d21df8cf39ac13a10b23a123", kill_on_drop: false }`
[INFO] [stdout] 50e2e643cbc6afabf448da4d1be09119de81dec8d21df8cf39ac13a10b23a123
[INFO] checking tether-agent-0.12.1 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate tether-agent 0.12.1 into /workspace/builds/worker-7-tc2/source
[INFO] validating manifest of crates.io crate tether-agent 0.12.1 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 tether-agent 0.12.1
[INFO] finished tweaking crates.io crate tether-agent 0.12.1
[INFO] tweaked toml for crates.io crate tether-agent 0.12.1 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate crates.io crate tether-agent 0.12.1 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" "+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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 2e4d85f0e3e951c7b29950885f41aa7ef8b6409292ab4635eef1364212aca90b
[INFO] running `Command { std: "docker" "start" "-a" "2e4d85f0e3e951c7b29950885f41aa7ef8b6409292ab4635eef1364212aca90b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2e4d85f0e3e951c7b29950885f41aa7ef8b6409292ab4635eef1364212aca90b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2e4d85f0e3e951c7b29950885f41aa7ef8b6409292ab4635eef1364212aca90b", kill_on_drop: false }`
[INFO] [stdout] 2e4d85f0e3e951c7b29950885f41aa7ef8b6409292ab4635eef1364212aca90b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] e6594998ab2c9d51726289f879db13318a0451d862074313896437e9e5fe6748
[INFO] running `Command { std: "docker" "start" "-a" "e6594998ab2c9d51726289f879db13318a0451d862074313896437e9e5fe6748", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.63
[INFO] [stderr]    Compiling quote v1.0.28
[INFO] [stderr]    Compiling unicode-ident v1.0.9
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling futures-core v0.3.28
[INFO] [stderr]    Compiling slab v0.4.8
[INFO] [stderr]    Compiling futures-task v0.3.28
[INFO] [stderr]    Compiling futures-channel v0.3.28
[INFO] [stderr]    Compiling crossbeam-utils v0.8.16
[INFO] [stderr]    Compiling cc v1.0.79
[INFO] [stderr]    Compiling libc v0.2.147
[INFO] [stderr]     Checking futures-sink v0.3.28
[INFO] [stderr]    Compiling futures-util v0.3.28
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]     Checking pin-project-lite v0.2.9
[INFO] [stderr]     Checking futures-io v0.3.28
[INFO] [stderr]    Compiling paste v1.0.12
[INFO] [stderr]    Compiling serde v1.0.164
[INFO] [stderr]    Compiling thiserror v1.0.40
[INFO] [stderr]    Compiling serde_json v1.0.99
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]    Compiling anyhow v1.0.71
[INFO] [stderr]     Checking log v0.4.19
[INFO] [stderr]     Checking regex-syntax v0.7.2
[INFO] [stderr]     Checking event-listener v2.5.3
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]    Compiling cmake v0.1.50
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]     Checking futures-timer v3.0.2
[INFO] [stderr]     Checking termcolor v1.2.0
[INFO] [stderr]     Checking ryu v1.0.13
[INFO] [stderr]     Checking itoa v1.0.6
[INFO] [stderr]     Checking aho-corasick v1.0.2
[INFO] [stderr]     Checking concurrent-queue v2.2.0
[INFO] [stderr]     Checking crossbeam-channel v0.5.8
[INFO] [stderr]    Compiling paho-mqtt-sys v0.8.1
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking async-channel v1.8.0
[INFO] [stderr]    Compiling syn v2.0.22
[INFO] [stderr]     Checking rmp v0.8.11
[INFO] [stderr]     Checking regex v1.8.4
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]    Compiling futures-macro v0.3.28
[INFO] [stderr]    Compiling serde_derive v1.0.164
[INFO] [stderr]    Compiling thiserror-impl v1.0.40
[INFO] [stderr]     Checking futures-executor v0.3.28
[INFO] [stderr]     Checking futures v0.3.28
[INFO] [stderr]     Checking paho-mqtt v0.12.1
[INFO] [stderr]     Checking rmp-serde v1.1.1
[INFO] [stderr]     Checking tether-agent v0.12.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `CustomStruct` is never constructed
[INFO] [stdout]  --> examples/error_handling.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct CustomStruct {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.72s
[INFO] running `Command { std: "docker" "inspect" "e6594998ab2c9d51726289f879db13318a0451d862074313896437e9e5fe6748", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e6594998ab2c9d51726289f879db13318a0451d862074313896437e9e5fe6748", kill_on_drop: false }`
[INFO] [stdout] e6594998ab2c9d51726289f879db13318a0451d862074313896437e9e5fe6748