[INFO] fetching crate libmodbus 1.0.1...
[INFO] checking libmodbus-1.0.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate libmodbus 1.0.1 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate libmodbus 1.0.1 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 libmodbus 1.0.1
[INFO] finished tweaking crates.io crate libmodbus 1.0.1
[INFO] tweaked toml for crates.io crate libmodbus 1.0.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate libmodbus 1.0.1 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 time v0.2.22
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[INFO] [stderr]   Downloaded syn v1.0.48
[INFO] [stderr]   Downloaded clang-sys v1.0.1
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[INFO] [stderr]   Downloaded cc v1.0.61
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[INFO] [stderr]   Downloaded base-x v0.2.7
[INFO] [stderr]   Downloaded time-macros-impl v0.1.1
[INFO] [stderr]   Downloaded libmodbus-sys v1.0.0
[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] 3744c9972a99b4713b4aab529f101a4e7e37c6527addf3f963328bfcd0b68e1f
[INFO] running `Command { std: "docker" "start" "-a" "3744c9972a99b4713b4aab529f101a4e7e37c6527addf3f963328bfcd0b68e1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3744c9972a99b4713b4aab529f101a4e7e37c6527addf3f963328bfcd0b68e1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3744c9972a99b4713b4aab529f101a4e7e37c6527addf3f963328bfcd0b68e1f", kill_on_drop: false }`
[INFO] [stdout] 3744c9972a99b4713b4aab529f101a4e7e37c6527addf3f963328bfcd0b68e1f
[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] 8268a5cfd9af044bae62a001e97ed309c3a6ff1cf267e0660c65a83bb6066a3d
[INFO] running `Command { std: "docker" "start" "-a" "8268a5cfd9af044bae62a001e97ed309c3a6ff1cf267e0660c65a83bb6066a3d", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.80
[INFO] [stderr]    Compiling version_check v0.9.2
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling glob v0.3.0
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling quick-error v1.2.3
[INFO] [stderr]    Compiling regex-syntax v0.6.21
[INFO] [stderr]    Compiling thread_local v1.0.1
[INFO] [stderr]    Compiling unicode-width v0.1.8
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling humantime v1.3.0
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]    Compiling clang-sys v1.0.1
[INFO] [stderr]    Compiling standback v0.2.11
[INFO] [stderr]    Compiling libloading v0.6.5
[INFO] [stderr]    Compiling aho-corasick v0.7.15
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling bindgen v0.55.1
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]    Compiling ansi_term v0.11.0
[INFO] [stderr]    Compiling termcolor v1.1.0
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling which v3.1.1
[INFO] [stderr]    Compiling shlex v0.1.1
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling rustc-hash v1.1.0
[INFO] [stderr]    Compiling lazycell v1.3.0
[INFO] [stderr]    Compiling peeking_take_while v0.1.2
[INFO] [stderr]    Compiling const_fn v0.4.3
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]    Compiling cc v1.0.61
[INFO] [stderr]    Compiling cexpr v0.4.0
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]    Compiling time v0.2.22
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]    Compiling regex v1.4.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]    Compiling env_logger v0.7.1
[INFO] [stderr]    Compiling time-macros-impl v0.1.1
[INFO] [stderr]     Checking time-macros v0.1.1
[INFO] [stderr]    Compiling libmodbus-sys v1.0.0
[INFO] [stderr]     Checking libmodbus v1.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Modbus` is imported redundantly
[INFO] [stdout]  --> examples/unit-test-client.rs:4:17
[INFO] [stdout]   |
[INFO] [stdout] 3 | use libmodbus::prelude::*;
[INFO] [stdout]   |     --------------------- the item `Modbus` is already imported here
[INFO] [stdout] 4 | use libmodbus::{Modbus, ModbusClient, ModbusTCP, ModbusTCPPI, ModbusRTU,
[INFO] [stdout]   |                 ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Modbus` is imported redundantly
[INFO] [stdout]  --> examples/unit-test-server.rs:7:17
[INFO] [stdout]   |
[INFO] [stdout] 7 | use libmodbus::{Modbus, ModbusMapping, ModbusClient, ModbusServer, ModbusTCP, ModbusTCPPI, ModbusRTU};
[INFO] [stdout]   |                 ^^^^^^
[INFO] [stdout] 8 | use libmodbus::Exception;
[INFO] [stdout] 9 | use libmodbus::prelude::*;
[INFO] [stdout]   |     --------------------- the item `Modbus` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `ModbusMapping` is imported redundantly
[INFO] [stdout]  --> examples/unit-test-server.rs:7:25
[INFO] [stdout]   |
[INFO] [stdout] 7 | use libmodbus::{Modbus, ModbusMapping, ModbusClient, ModbusServer, ModbusTCP, ModbusTCPPI, ModbusRTU};
[INFO] [stdout]   |                         ^^^^^^^^^^^^^
[INFO] [stdout] 8 | use libmodbus::Exception;
[INFO] [stdout] 9 | use libmodbus::prelude::*;
[INFO] [stdout]   |     --------------------- the item `ModbusMapping` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings 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 44.21s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: nom v5.1.2
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 5`
[INFO] running `Command { std: "docker" "inspect" "8268a5cfd9af044bae62a001e97ed309c3a6ff1cf267e0660c65a83bb6066a3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8268a5cfd9af044bae62a001e97ed309c3a6ff1cf267e0660c65a83bb6066a3d", kill_on_drop: false }`
[INFO] [stdout] 8268a5cfd9af044bae62a001e97ed309c3a6ff1cf267e0660c65a83bb6066a3d
[INFO] checking libmodbus-1.0.1 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate libmodbus 1.0.1 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate libmodbus 1.0.1 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 libmodbus 1.0.1
[INFO] finished tweaking crates.io crate libmodbus 1.0.1
[INFO] tweaked toml for crates.io crate libmodbus 1.0.1 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate crates.io crate libmodbus 1.0.1 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] 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] a77cd7dfb62d09b690a5dbd1970256072473203c0cbadb23c83755bdc1e80e34
[INFO] running `Command { std: "docker" "start" "-a" "a77cd7dfb62d09b690a5dbd1970256072473203c0cbadb23c83755bdc1e80e34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a77cd7dfb62d09b690a5dbd1970256072473203c0cbadb23c83755bdc1e80e34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a77cd7dfb62d09b690a5dbd1970256072473203c0cbadb23c83755bdc1e80e34", kill_on_drop: false }`
[INFO] [stdout] a77cd7dfb62d09b690a5dbd1970256072473203c0cbadb23c83755bdc1e80e34
[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] 6cb8708144c9e31abcb8a65abfcc47c77b8afd4dd5d856d684a0240dceba0b1e
[INFO] running `Command { std: "docker" "start" "-a" "6cb8708144c9e31abcb8a65abfcc47c77b8afd4dd5d856d684a0240dceba0b1e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.80
[INFO] [stderr]    Compiling version_check v0.9.2
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling glob v0.3.0
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling quick-error v1.2.3
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling thread_local v1.0.1
[INFO] [stderr]    Compiling regex-syntax v0.6.21
[INFO] [stderr]    Compiling unicode-width v0.1.8
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]    Compiling standback v0.2.11
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling clang-sys v1.0.1
[INFO] [stderr]    Compiling aho-corasick v0.7.15
[INFO] [stderr]    Compiling libloading v0.6.5
[INFO] [stderr]    Compiling humantime v1.3.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]    Compiling termcolor v1.1.0
[INFO] [stderr]    Compiling ansi_term v0.11.0
[INFO] [stderr]    Compiling bindgen v0.55.1
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling which v3.1.1
[INFO] [stderr]    Compiling rustc-hash v1.1.0
[INFO] [stderr]    Compiling peeking_take_while v0.1.2
[INFO] [stderr]    Compiling lazycell v1.3.0
[INFO] [stderr]    Compiling shlex v0.1.1
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]    Compiling cc v1.0.61
[INFO] [stderr]    Compiling const_fn v0.4.3
[INFO] [stderr]    Compiling regex v1.4.2
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]    Compiling cexpr v0.4.0
[INFO] [stderr]    Compiling time v0.2.22
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]    Compiling env_logger v0.7.1
[INFO] [stderr]    Compiling time-macros-impl v0.1.1
[INFO] [stderr]     Checking time-macros v0.1.1
[INFO] [stderr]    Compiling libmodbus-sys v1.0.0
[INFO] [stderr]     Checking libmodbus v1.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Modbus` is imported redundantly
[INFO] [stdout]  --> examples/unit-test-client.rs:4:17
[INFO] [stdout]   |
[INFO] [stdout] 3 | use libmodbus::prelude::*;
[INFO] [stdout]   |     --------------------- the item `Modbus` is already imported here
[INFO] [stdout] 4 | use libmodbus::{Modbus, ModbusClient, ModbusTCP, ModbusTCPPI, ModbusRTU,
[INFO] [stdout]   |                 ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Modbus` is imported redundantly
[INFO] [stdout]  --> examples/unit-test-server.rs:7:17
[INFO] [stdout]   |
[INFO] [stdout] 7 | use libmodbus::{Modbus, ModbusMapping, ModbusClient, ModbusServer, ModbusTCP, ModbusTCPPI, ModbusRTU};
[INFO] [stdout]   |                 ^^^^^^
[INFO] [stdout] 8 | use libmodbus::Exception;
[INFO] [stdout] 9 | use libmodbus::prelude::*;
[INFO] [stdout]   |     --------------------- the item `Modbus` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `ModbusMapping` is imported redundantly
[INFO] [stdout]  --> examples/unit-test-server.rs:7:25
[INFO] [stdout]   |
[INFO] [stdout] 7 | use libmodbus::{Modbus, ModbusMapping, ModbusClient, ModbusServer, ModbusTCP, ModbusTCPPI, ModbusRTU};
[INFO] [stdout]   |                         ^^^^^^^^^^^^^
[INFO] [stdout] 8 | use libmodbus::Exception;
[INFO] [stdout] 9 | use libmodbus::prelude::*;
[INFO] [stdout]   |     --------------------- the item `ModbusMapping` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings 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 45.68s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: nom v5.1.2
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 5`
[INFO] running `Command { std: "docker" "inspect" "6cb8708144c9e31abcb8a65abfcc47c77b8afd4dd5d856d684a0240dceba0b1e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6cb8708144c9e31abcb8a65abfcc47c77b8afd4dd5d856d684a0240dceba0b1e", kill_on_drop: false }`
[INFO] [stdout] 6cb8708144c9e31abcb8a65abfcc47c77b8afd4dd5d856d684a0240dceba0b1e