[INFO] updating cached repository LPGhatguy/teensy-rust-experiment
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/LPGhatguy/teensy-rust-experiment
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/LPGhatguy/teensy-rust-experiment" "work/ex/beta-1.38-1/sources/1.37.0/gh/LPGhatguy/teensy-rust-experiment"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/LPGhatguy/teensy-rust-experiment'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/LPGhatguy/teensy-rust-experiment" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/LPGhatguy/teensy-rust-experiment"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/LPGhatguy/teensy-rust-experiment'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] cf0b72ac8780718840096dfac5c7f99c0b0835ad
[INFO] sha for GitHub repo LPGhatguy/teensy-rust-experiment: cf0b72ac8780718840096dfac5c7f99c0b0835ad
[INFO] validating manifest of LPGhatguy/teensy-rust-experiment on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of LPGhatguy/teensy-rust-experiment on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing LPGhatguy/teensy-rust-experiment
[INFO] finished frobbing LPGhatguy/teensy-rust-experiment
[INFO] frobbed toml for LPGhatguy/teensy-rust-experiment written to work/ex/beta-1.38-1/sources/1.37.0/gh/LPGhatguy/teensy-rust-experiment/Cargo.toml
[INFO] started frobbing LPGhatguy/teensy-rust-experiment
[INFO] finished frobbing LPGhatguy/teensy-rust-experiment
[INFO] frobbed toml for LPGhatguy/teensy-rust-experiment written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/LPGhatguy/teensy-rust-experiment/Cargo.toml
[INFO] crate LPGhatguy/teensy-rust-experiment already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing LPGhatguy/teensy-rust-experiment against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/LPGhatguy/teensy-rust-experiment:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] f35b73d78a9cdd7519af2ce5a6af758ed6be61503faa3faac365e0e0bf90d3be
[INFO] running `"docker" "start" "-a" "f35b73d78a9cdd7519af2ce5a6af758ed6be61503faa3faac365e0e0bf90d3be"`
[INFO] [stderr]    Compiling bit_field v0.8.0
[INFO] [stderr]    Compiling volatile v0.2.3
[INFO] [stderr]    Compiling teensy-rs v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(lang_items, asm)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `core`
[INFO] [stderr]  --> src/port.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use core;
[INFO] [stderr]   |     ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `bit_field::BitField`
[INFO] [stderr]  --> src/port.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use bit_field::BitField;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `core`
[INFO] [stderr]  --> src/sim.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use core;
[INFO] [stderr]   |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `core`
[INFO] [stderr]  --> src/watchdog.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use core;
[INFO] [stderr]   |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0522]: definition of an unknown language item: `panic_fmt`
[INFO] [stderr]   --> src/main.rs:32:1
[INFO] [stderr]    |
[INFO] [stderr] 32 | #[lang = "panic_fmt"]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^ definition of unknown language item `panic_fmt`
[INFO] [stderr] 
[INFO] [stderr] error: `#[panic_handler]` function required, but not found
[INFO] [stderr] 
[INFO] [stderr] error: language item required, but not found: `eh_personality`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0522, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0522`.
[INFO] [stderr] error: Could not compile `teensy-rs`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f35b73d78a9cdd7519af2ce5a6af758ed6be61503faa3faac365e0e0bf90d3be"`
[INFO] running `"docker" "rm" "-f" "f35b73d78a9cdd7519af2ce5a6af758ed6be61503faa3faac365e0e0bf90d3be"`
[INFO] [stdout] f35b73d78a9cdd7519af2ce5a6af758ed6be61503faa3faac365e0e0bf90d3be