[INFO] cloning repository https://github.com/rdelfin/discovery_board
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rdelfin/discovery_board" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frdelfin%2Fdiscovery_board", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frdelfin%2Fdiscovery_board'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4c0501df6d6057d3c230e1950e7fc46008d16c88
[INFO] checking rdelfin/discovery_board against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frdelfin%2Fdiscovery_board" "/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/rdelfin/discovery_board on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-2-tc1/source/.cargo/config.toml
[INFO] started tweaking git repo https://github.com/rdelfin/discovery_board
[INFO] finished tweaking git repo https://github.com/rdelfin/discovery_board
[INFO] tweaked toml for git repo https://github.com/rdelfin/discovery_board written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/rdelfin/discovery_board 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded switch-hal v0.4.0
[INFO] [stderr]   Downloaded stm32f3xx-hal v0.6.1
[INFO] [stderr]   Downloaded cortex-m-rt v0.6.15
[INFO] [stderr]   Downloaded volatile v0.4.4
[INFO] [stderr]   Downloaded rtcc v0.2.1
[INFO] [stderr]   Downloaded panic-itm v0.4.2
[INFO] [stderr]   Downloaded lsm303dlhc v0.2.0
[INFO] [stderr]   Downloaded cortex-m-rt-macros v0.6.15
[INFO] [stderr]   Downloaded as-slice v0.1.5
[INFO] [stderr]   Downloaded r0 v0.2.2
[INFO] [stderr]   Downloaded stm32f3-discovery v0.6.1
[INFO] [stderr]   Downloaded accelerometer v0.12.0
[INFO] [stderr]   Downloaded cast v0.2.7
[INFO] [stderr]   Downloaded generic-array v0.11.2
[INFO] [stderr]   Downloaded embedded-dma v0.1.2
[INFO] [stderr]   Downloaded stm32-usbd v0.5.1
[INFO] [stderr]   Downloaded cortex-m v0.7.3
[INFO] [stderr]   Downloaded syn v1.0.78
[INFO] [stderr]   Downloaded generic-array v0.13.3
[INFO] [stderr]   Downloaded aligned v0.3.5
[INFO] [stderr]   Downloaded cortex-m v0.6.7
[INFO] [stderr]   Downloaded embedded-hal v0.2.6
[INFO] [stderr]   Downloaded stm32f3 v0.12.1
[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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0d3ded7f353ac2c357526c025896c40e8b3653de29ee5c7f14a11c5559be59e4
[INFO] running `Command { std: "docker" "start" "-a" "0d3ded7f353ac2c357526c025896c40e8b3653de29ee5c7f14a11c5559be59e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0d3ded7f353ac2c357526c025896c40e8b3653de29ee5c7f14a11c5559be59e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d3ded7f353ac2c357526c025896c40e8b3653de29ee5c7f14a11c5559be59e4", kill_on_drop: false }`
[INFO] [stdout] 0d3ded7f353ac2c357526c025896c40e8b3653de29ee5c7f14a11c5559be59e4
[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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 502c6edb72b70fb598e1fd51daa29fef92b04cc87ddd22d7a13af7478a5a1370
[INFO] running `Command { std: "docker" "start" "-a" "502c6edb72b70fb598e1fd51daa29fef92b04cc87ddd22d7a13af7478a5a1370", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.14.0
[INFO] [stderr]     Checking nb v1.0.0
[INFO] [stderr]    Compiling cortex-m v0.7.3
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]     Checking vcell v0.1.3
[INFO] [stderr]    Compiling semver v1.0.4
[INFO] [stderr]    Compiling cortex-m-rt v0.6.15
[INFO] [stderr]     Checking bitfield v0.13.2
[INFO] [stderr]    Compiling syn v1.0.78
[INFO] [stderr]    Compiling cortex-m v0.6.7
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]     Checking r0 v0.2.2
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking volatile-register v0.2.1
[INFO] [stderr]    Compiling stm32f3 v0.12.1
[INFO] [stderr]     Checking nb v0.1.3
[INFO] [stderr]    Compiling stm32-usbd v0.5.1
[INFO] [stderr]     Checking embedded-hal v0.2.6
[INFO] [stderr]     Checking usb-device v0.2.8
[INFO] [stderr]     Checking embedded-dma v0.1.2
[INFO] [stderr]    Compiling stm32f3-discovery v0.6.1
[INFO] [stderr]    Compiling paste v1.0.5
[INFO] [stderr]     Checking switch-hal v0.4.0
[INFO] [stderr]     Checking volatile v0.4.4
[INFO] [stderr]     Checking panic-itm v0.4.2
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]    Compiling cast v0.2.7
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking generic-array v0.13.3
[INFO] [stderr]     Checking generic-array v0.12.4
[INFO] [stderr]     Checking generic-array v0.11.2
[INFO] [stderr]     Checking lsm303dlhc v0.2.0
[INFO] [stderr]     Checking as-slice v0.1.5
[INFO] [stderr]     Checking micromath v1.1.1
[INFO] [stderr]     Checking rtcc v0.2.1
[INFO] [stderr]     Checking accelerometer v0.12.0
[INFO] [stderr]     Checking aligned v0.3.5
[INFO] [stderr]    Compiling cortex-m-rt-macros v0.6.15
[INFO] [stderr]     Checking stm32f3xx-hal v0.6.1
[INFO] [stderr]     Checking discovery_board v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `panic_itm as _`
[INFO] [stdout]  --> src/lib.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use panic_itm as _; // panic handler
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `stm32f3xx_hal::prelude::*`
[INFO] [stdout]   --> src/lib.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use stm32f3xx_hal::prelude::*;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `panic_itm as _`
[INFO] [stdout]  --> src/lib.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use panic_itm as _; // panic handler
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `stm32f3xx_hal::prelude::*`
[INFO] [stdout]   --> src/lib.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use stm32f3xx_hal::prelude::*;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ITM`, `iprintln`
[INFO] [stdout]  --> src/bin/safe_registers.rs:4:23
[INFO] [stdout]   |
[INFO] [stdout] 4 | use disc_aux::{entry, iprintln, ITM};
[INFO] [stdout]   |                       ^^^^^^^^  ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/bin/hello_world.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     panic!("Goodbye, world :(");
[INFO] [stdout]    |     --------------------------- any code following this expression is unreachable
[INFO] [stdout] 13 |
[INFO] [stdout] 14 |     loop {}
[INFO] [stdout]    |     ^^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/bin/hello_world.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     panic!("Goodbye, world :(");
[INFO] [stdout]    |     --------------------------- any code following this expression is unreachable
[INFO] [stdout] 13 |
[INFO] [stdout] 14 |     loop {}
[INFO] [stdout]    |     ^^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` 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: unused imports: `iprint`, `iprintln`
[INFO] [stdout]  --> src/bin/registers.rs:5:23
[INFO] [stdout]   |
[INFO] [stdout] 5 | use disc_aux::{entry, iprint, iprintln};
[INFO] [stdout]   |                       ^^^^^^  ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ITM`, `iprintln`
[INFO] [stdout]  --> src/bin/safe_registers.rs:4:23
[INFO] [stdout]   |
[INFO] [stdout] 4 | use disc_aux::{entry, iprintln, ITM};
[INFO] [stdout]   |                       ^^^^^^^^  ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `iprint`, `iprintln`
[INFO] [stdout]  --> src/bin/registers.rs:5:23
[INFO] [stdout]   |
[INFO] [stdout] 5 | use disc_aux::{entry, iprint, iprintln};
[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] [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 12.64s
[INFO] running `Command { std: "docker" "inspect" "502c6edb72b70fb598e1fd51daa29fef92b04cc87ddd22d7a13af7478a5a1370", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "502c6edb72b70fb598e1fd51daa29fef92b04cc87ddd22d7a13af7478a5a1370", kill_on_drop: false }`
[INFO] [stdout] 502c6edb72b70fb598e1fd51daa29fef92b04cc87ddd22d7a13af7478a5a1370