[INFO] cloning repository https://github.com/emersonmde/double_barrel
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/emersonmde/double_barrel" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Femersonmde%2Fdouble_barrel", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Femersonmde%2Fdouble_barrel'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 21e17d01996e568fd16fff959e8e318aa2586eb1
[INFO] checking emersonmde/double_barrel against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Femersonmde%2Fdouble_barrel" "/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/emersonmde/double_barrel 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/emersonmde/double_barrel
[INFO] finished tweaking git repo https://github.com/emersonmde/double_barrel
[INFO] tweaked toml for git repo https://github.com/emersonmde/double_barrel written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/emersonmde/double_barrel 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] 41fce7ec9f080ba4a67772b04a0690bc34ae6e0e969071b83cf84bcccc361c4b
[INFO] running `Command { std: "docker" "start" "-a" "41fce7ec9f080ba4a67772b04a0690bc34ae6e0e969071b83cf84bcccc361c4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "41fce7ec9f080ba4a67772b04a0690bc34ae6e0e969071b83cf84bcccc361c4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "41fce7ec9f080ba4a67772b04a0690bc34ae6e0e969071b83cf84bcccc361c4b", kill_on_drop: false }`
[INFO] [stdout] 41fce7ec9f080ba4a67772b04a0690bc34ae6e0e969071b83cf84bcccc361c4b
[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] e1253f679053049c5b9d36c0728eced87956405cc69db16de9f6e65383cf9154
[INFO] running `Command { std: "docker" "start" "-a" "e1253f679053049c5b9d36c0728eced87956405cc69db16de9f6e65383cf9154", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.84
[INFO] [stderr]     Checking smallvec v1.7.0
[INFO] [stderr]     Checking pin-project-lite v0.2.7
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stderr]     Checking lock_api v0.4.5
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking signal-hook-registry v1.4.0
[INFO] [stderr]     Checking mio v0.7.14
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking parking_lot_core v0.8.5
[INFO] [stderr]    Compiling quote v1.0.14
[INFO] [stderr]     Checking parking_lot v0.11.2
[INFO] [stderr]    Compiling tokio-macros v1.7.0
[INFO] [stderr]     Checking tokio v1.15.0
[INFO] [stderr]     Checking double_barrel v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ByteOrder`, `LittleEndian`
[INFO] [stdout]  --> src/lib.rs:2:17
[INFO] [stdout]   |
[INFO] [stdout] 2 | use byteorder::{ByteOrder, LittleEndian};
[INFO] [stdout]   |                 ^^^^^^^^^  ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ByteOrder`, `LittleEndian`
[INFO] [stdout]  --> src/lib.rs:2:17
[INFO] [stdout]   |
[INFO] [stdout] 2 | use byteorder::{ByteOrder, LittleEndian};
[INFO] [stdout]   |                 ^^^^^^^^^  ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `file_name` is never read
[INFO] [stdout]   --> src/lib.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub struct DoubleBarrel {
[INFO] [stdout]    |            ------------ field in this struct
[INFO] [stdout] 19 |     file_name: String,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `print_stack` is never used
[INFO] [stdout]    --> src/mmu.rs:106:12
[INFO] [stdout]     |
[INFO] [stdout] 28  | impl MemoryManagementUnit {
[INFO] [stdout]     | ------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 106 |     pub fn print_stack(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `print_registers` is never used
[INFO] [stdout]   --> src/cpu.rs:38:12
[INFO] [stdout]    |
[INFO] [stdout] 28 | impl CPU {
[INFO] [stdout]    | -------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 38 |     pub fn print_registers(&self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `instruction_register` is never read
[INFO] [stdout]  --> src/lcd.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct LiquidCrystalDisplay {
[INFO] [stdout]   |            -------------------- field in this struct
[INFO] [stdout] 6 |     instruction_register: u8,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `file_name` is never read
[INFO] [stdout]   --> src/lib.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub struct DoubleBarrel {
[INFO] [stdout]    |            ------------ field in this struct
[INFO] [stdout] 19 |     file_name: String,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `print_stack` is never used
[INFO] [stdout]    --> src/mmu.rs:106:12
[INFO] [stdout]     |
[INFO] [stdout] 28  | impl MemoryManagementUnit {
[INFO] [stdout]     | ------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 106 |     pub fn print_stack(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `print_registers` is never used
[INFO] [stdout]   --> src/cpu.rs:38:12
[INFO] [stdout]    |
[INFO] [stdout] 28 | impl CPU {
[INFO] [stdout]    | -------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 38 |     pub fn print_registers(&self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `instruction_register` is never read
[INFO] [stdout]  --> src/lcd.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct LiquidCrystalDisplay {
[INFO] [stdout]   |            -------------------- field in this struct
[INFO] [stdout] 6 |     instruction_register: u8,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.25s
[INFO] running `Command { std: "docker" "inspect" "e1253f679053049c5b9d36c0728eced87956405cc69db16de9f6e65383cf9154", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1253f679053049c5b9d36c0728eced87956405cc69db16de9f6e65383cf9154", kill_on_drop: false }`
[INFO] [stdout] e1253f679053049c5b9d36c0728eced87956405cc69db16de9f6e65383cf9154