[INFO] cloning repository https://github.com/learning/nand2tetris-assembler
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/learning/nand2tetris-assembler" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flearning%2Fnand2tetris-assembler", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flearning%2Fnand2tetris-assembler'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5f388be0e031de6946c31ae7b73d679fd5ea86fd
[INFO] checking learning/nand2tetris-assembler against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flearning%2Fnand2tetris-assembler" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/learning/nand2tetris-assembler 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 git repo https://github.com/learning/nand2tetris-assembler
[INFO] finished tweaking git repo https://github.com/learning/nand2tetris-assembler
[INFO] tweaked toml for git repo https://github.com/learning/nand2tetris-assembler written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/learning/nand2tetris-assembler 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] 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] 1e7020a932e360672dc4f86113f4a7fb6ad7bd214c585119e4f1979d25a8d6bf
[INFO] running `Command { std: "docker" "start" "-a" "1e7020a932e360672dc4f86113f4a7fb6ad7bd214c585119e4f1979d25a8d6bf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1e7020a932e360672dc4f86113f4a7fb6ad7bd214c585119e4f1979d25a8d6bf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e7020a932e360672dc4f86113f4a7fb6ad7bd214c585119e4f1979d25a8d6bf", kill_on_drop: false }`
[INFO] [stdout] 1e7020a932e360672dc4f86113f4a7fb6ad7bd214c585119e4f1979d25a8d6bf
[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] 4f9ac5e7cfbf41f98b5e7636019dcde8127a9fe27327c080b4fc5613820a4022
[INFO] running `Command { std: "docker" "start" "-a" "4f9ac5e7cfbf41f98b5e7636019dcde8127a9fe27327c080b4fc5613820a4022", kill_on_drop: false }`
[INFO] [stderr]     Checking nand2tetris-assembler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Read` is imported redundantly
[INFO] [stdout]  --> src/main.rs:8:26
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io::prelude::*;
[INFO] [stdout]   |     ------------------- the item `Read` is already imported here
[INFO] [stdout] 8 | use std::io::{BufReader, Read};
[INFO] [stdout]   |                          ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Read` is imported redundantly
[INFO] [stdout]  --> src/main.rs:8:26
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io::prelude::*;
[INFO] [stdout]   |     ------------------- the item `Read` is already imported here
[INFO] [stdout] 8 | use std::io::{BufReader, Read};
[INFO] [stdout]   |                          ^^^^
[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 0.16s
[INFO] running `Command { std: "docker" "inspect" "4f9ac5e7cfbf41f98b5e7636019dcde8127a9fe27327c080b4fc5613820a4022", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f9ac5e7cfbf41f98b5e7636019dcde8127a9fe27327c080b4fc5613820a4022", kill_on_drop: false }`
[INFO] [stdout] 4f9ac5e7cfbf41f98b5e7636019dcde8127a9fe27327c080b4fc5613820a4022
[INFO] checking learning/nand2tetris-assembler against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flearning%2Fnand2tetris-assembler" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/learning/nand2tetris-assembler 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 git repo https://github.com/learning/nand2tetris-assembler
[INFO] finished tweaking git repo https://github.com/learning/nand2tetris-assembler
[INFO] tweaked toml for git repo https://github.com/learning/nand2tetris-assembler written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/learning/nand2tetris-assembler 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-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] ef07e573d249f4fc26deba24069878ab6a950404c521900ea676145392991f32
[INFO] running `Command { std: "docker" "start" "-a" "ef07e573d249f4fc26deba24069878ab6a950404c521900ea676145392991f32", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ef07e573d249f4fc26deba24069878ab6a950404c521900ea676145392991f32", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef07e573d249f4fc26deba24069878ab6a950404c521900ea676145392991f32", kill_on_drop: false }`
[INFO] [stdout] ef07e573d249f4fc26deba24069878ab6a950404c521900ea676145392991f32
[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] af4f7a19c1d237117483de687016473a413ec94199e8121f9d0654f9a0f24d7b
[INFO] running `Command { std: "docker" "start" "-a" "af4f7a19c1d237117483de687016473a413ec94199e8121f9d0654f9a0f24d7b", kill_on_drop: false }`
[INFO] [stderr]     Checking nand2tetris-assembler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Read` is imported redundantly
[INFO] [stdout]  --> src/main.rs:8:26
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io::prelude::*;
[INFO] [stdout]   |     ------------------- the item `Read` is already imported here
[INFO] [stdout] 8 | use std::io::{BufReader, Read};
[INFO] [stdout]   |                          ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Read` is imported redundantly
[INFO] [stdout]  --> src/main.rs:8:26
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io::prelude::*;
[INFO] [stdout]   |     ------------------- the item `Read` is already imported here
[INFO] [stdout] 8 | use std::io::{BufReader, Read};
[INFO] [stdout]   |                          ^^^^
[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 0.17s
[INFO] running `Command { std: "docker" "inspect" "af4f7a19c1d237117483de687016473a413ec94199e8121f9d0654f9a0f24d7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af4f7a19c1d237117483de687016473a413ec94199e8121f9d0654f9a0f24d7b", kill_on_drop: false }`
[INFO] [stdout] af4f7a19c1d237117483de687016473a413ec94199e8121f9d0654f9a0f24d7b