[INFO] fetching crate rn2xx3 0.2.1...
[INFO] checking rn2xx3-0.2.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate rn2xx3 0.2.1 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate rn2xx3 0.2.1 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 rn2xx3 0.2.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate rn2xx3 0.2.1
[INFO] tweaked toml for crates.io crate rn2xx3 0.2.1 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate crates.io crate rn2xx3 0.2.1 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 serial v0.4.0
[INFO] [stderr]   Downloaded serial-unix v0.4.0
[INFO] [stderr]   Downloaded serial-windows v0.4.0
[INFO] [stderr]   Downloaded nb v1.0.0
[INFO] [stderr]   Downloaded linux-embedded-hal v0.3.0
[INFO] [stderr]   Downloaded embedded-hal v0.2.6
[INFO] [stderr]   Downloaded base16 v0.2.1
[INFO] [stderr]   Downloaded spidev v0.4.1
[INFO] [stderr]   Downloaded sysfs_gpio v0.5.4
[INFO] [stderr]   Downloaded ioctl-rs v0.1.6
[INFO] [stderr]   Downloaded termios v0.2.2
[INFO] [stderr]   Downloaded serial-core v0.4.0
[INFO] [stderr]   Downloaded embedded-hal-mock v0.7.2
[INFO] [stderr]   Downloaded i2cdev v0.4.4
[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] 41d8f71a1dab172a00ab7a0615d1d7166d264825cc14a67b8fbe09ece9c88438
[INFO] running `Command { std: "docker" "start" "-a" "41d8f71a1dab172a00ab7a0615d1d7166d264825cc14a67b8fbe09ece9c88438", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "41d8f71a1dab172a00ab7a0615d1d7166d264825cc14a67b8fbe09ece9c88438", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "41d8f71a1dab172a00ab7a0615d1d7166d264825cc14a67b8fbe09ece9c88438", kill_on_drop: false }`
[INFO] [stdout] 41d8f71a1dab172a00ab7a0615d1d7166d264825cc14a67b8fbe09ece9c88438
[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] c9bcb1e46cc46d1633e79738ae9f7177d704fdc516dd9f60f6d364ef3078415e
[INFO] running `Command { std: "docker" "start" "-a" "c9bcb1e46cc46d1633e79738ae9f7177d704fdc516dd9f60f6d364ef3078415e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.101
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling semver v1.0.4
[INFO] [stderr]    Compiling nix v0.14.1
[INFO] [stderr]     Checking nb v1.0.0
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking nb v0.1.3
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking embedded-hal v0.2.6
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]     Checking base16 v0.2.1
[INFO] [stderr]     Checking numtoa v0.2.4
[INFO] [stderr]     Checking termcolor v1.1.2
[INFO] [stderr]     Checking embedded-hal-mock v0.7.2
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]     Checking rn2xx3 v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling cast v0.2.7
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking termios v0.2.2
[INFO] [stderr]     Checking ioctl-rs v0.1.6
[INFO] [stderr]     Checking serial-core v0.4.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking serial-unix v0.4.0
[INFO] [stderr]     Checking serial v0.4.0
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking sysfs_gpio v0.5.4
[INFO] [stderr]     Checking i2cdev v0.4.4
[INFO] [stderr]     Checking spidev v0.4.1
[INFO] [stderr]     Checking linux-embedded-hal v0.3.0
[INFO] [stdout] warning: the item `serial` is imported redundantly
[INFO] [stdout]  --> examples/common.rs:5:14
[INFO] [stdout]   |
[INFO] [stdout] 5 | use serial::{self, core::SerialPort};
[INFO] [stdout]   |              ^^^^ the item `serial` 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 `env_logger` is imported redundantly
[INFO] [stdout]  --> examples/sleep.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use env_logger;
[INFO] [stdout]   |     ^^^^^^^^^^ the item `env_logger` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serial` is imported redundantly
[INFO] [stdout]  --> examples/common.rs:5:14
[INFO] [stdout]   |
[INFO] [stdout] 5 | use serial::{self, core::SerialPort};
[INFO] [stdout]   |              ^^^^ the item `serial` 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 `serial` is imported redundantly
[INFO] [stdout]  --> examples/common.rs:5:14
[INFO] [stdout]   |
[INFO] [stdout] 5 | use serial::{self, core::SerialPort};
[INFO] [stdout]   |              ^^^^ the item `serial` 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 10.33s
[INFO] running `Command { std: "docker" "inspect" "c9bcb1e46cc46d1633e79738ae9f7177d704fdc516dd9f60f6d364ef3078415e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c9bcb1e46cc46d1633e79738ae9f7177d704fdc516dd9f60f6d364ef3078415e", kill_on_drop: false }`
[INFO] [stdout] c9bcb1e46cc46d1633e79738ae9f7177d704fdc516dd9f60f6d364ef3078415e
[INFO] checking rn2xx3-0.2.1 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate rn2xx3 0.2.1 into /workspace/builds/worker-7-tc2/source
[INFO] validating manifest of crates.io crate rn2xx3 0.2.1 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 rn2xx3 0.2.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate rn2xx3 0.2.1
[INFO] tweaked toml for crates.io crate rn2xx3 0.2.1 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate crates.io crate rn2xx3 0.2.1 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-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] 5cb638ecf9d0ebad02075cde3ad34112e211e7f044109550e9c613bb51292d2a
[INFO] running `Command { std: "docker" "start" "-a" "5cb638ecf9d0ebad02075cde3ad34112e211e7f044109550e9c613bb51292d2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5cb638ecf9d0ebad02075cde3ad34112e211e7f044109550e9c613bb51292d2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5cb638ecf9d0ebad02075cde3ad34112e211e7f044109550e9c613bb51292d2a", kill_on_drop: false }`
[INFO] [stdout] 5cb638ecf9d0ebad02075cde3ad34112e211e7f044109550e9c613bb51292d2a
[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] 01c13ca28a4bb265de7070c2ceaca2f82c0ec5ea8a09db2d886d4c53a72fc0a7
[INFO] running `Command { std: "docker" "start" "-a" "01c13ca28a4bb265de7070c2ceaca2f82c0ec5ea8a09db2d886d4c53a72fc0a7", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.101
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling semver v1.0.4
[INFO] [stderr]    Compiling nix v0.14.1
[INFO] [stderr]     Checking nb v1.0.0
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking nb v0.1.3
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking embedded-hal v0.2.6
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]     Checking numtoa v0.2.4
[INFO] [stderr]     Checking base16 v0.2.1
[INFO] [stderr]     Checking termcolor v1.1.2
[INFO] [stderr]     Checking embedded-hal-mock v0.7.2
[INFO] [stderr]     Checking rn2xx3 v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]    Compiling cast v0.2.7
[INFO] [stderr]     Checking serial-core v0.4.0
[INFO] [stderr]     Checking termios v0.2.2
[INFO] [stderr]     Checking ioctl-rs v0.1.6
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking serial-unix v0.4.0
[INFO] [stderr]     Checking serial v0.4.0
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking spidev v0.4.1
[INFO] [stderr]     Checking i2cdev v0.4.4
[INFO] [stderr]     Checking sysfs_gpio v0.5.4
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking linux-embedded-hal v0.3.0
[INFO] [stdout] warning: the item `serial` is imported redundantly
[INFO] [stdout]  --> examples/common.rs:5:14
[INFO] [stdout]   |
[INFO] [stdout] 5 | use serial::{self, core::SerialPort};
[INFO] [stdout]   |              ^^^^ the item `serial` 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 `serial` is imported redundantly
[INFO] [stdout]  --> examples/common.rs:5:14
[INFO] [stdout]   |
[INFO] [stdout] 5 | use serial::{self, core::SerialPort};
[INFO] [stdout]   |              ^^^^ the item `serial` 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] [stdout] warning: the item `serial` is imported redundantly
[INFO] [stdout]  --> examples/common.rs:5:14
[INFO] [stdout]   |
[INFO] [stdout] 5 | use serial::{self, core::SerialPort};
[INFO] [stdout]   |              ^^^^ the item `serial` 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 `env_logger` is imported redundantly
[INFO] [stdout]  --> examples/sleep.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use env_logger;
[INFO] [stdout]   |     ^^^^^^^^^^ the item `env_logger` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.97s
[INFO] running `Command { std: "docker" "inspect" "01c13ca28a4bb265de7070c2ceaca2f82c0ec5ea8a09db2d886d4c53a72fc0a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01c13ca28a4bb265de7070c2ceaca2f82c0ec5ea8a09db2d886d4c53a72fc0a7", kill_on_drop: false }`
[INFO] [stdout] 01c13ca28a4bb265de7070c2ceaca2f82c0ec5ea8a09db2d886d4c53a72fc0a7