[INFO] updating cached repository vijaysharmay/rust-session-part-1
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/vijaysharmay/rust-session-part-1
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/vijaysharmay/rust-session-part-1" "work/ex/beta-1.38-1/sources/1.37.0/gh/vijaysharmay/rust-session-part-1"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/vijaysharmay/rust-session-part-1'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/vijaysharmay/rust-session-part-1" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vijaysharmay/rust-session-part-1"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vijaysharmay/rust-session-part-1'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c2d2d75c76d8f4dac56cc464f257337e34de687a
[INFO] sha for GitHub repo vijaysharmay/rust-session-part-1: c2d2d75c76d8f4dac56cc464f257337e34de687a
[INFO] validating manifest of vijaysharmay/rust-session-part-1 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 vijaysharmay/rust-session-part-1 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 vijaysharmay/rust-session-part-1
[INFO] finished frobbing vijaysharmay/rust-session-part-1
[INFO] frobbed toml for vijaysharmay/rust-session-part-1 written to work/ex/beta-1.38-1/sources/1.37.0/gh/vijaysharmay/rust-session-part-1/Cargo.toml
[INFO] started frobbing vijaysharmay/rust-session-part-1
[INFO] finished frobbing vijaysharmay/rust-session-part-1
[INFO] frobbed toml for vijaysharmay/rust-session-part-1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vijaysharmay/rust-session-part-1/Cargo.toml
[INFO] crate vijaysharmay/rust-session-part-1 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 vijaysharmay/rust-session-part-1 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vijaysharmay/rust-session-part-1:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 95a71eb50b2536a8145c1ac41f4c3d89441f508f27fecd5766464b8d3e0e1271
[INFO] running `"docker" "start" "-a" "95a71eb50b2536a8145c1ac41f4c3d89441f508f27fecd5766464b8d3e0e1271"`
[INFO] [stderr]    Compiling rust-techtonic-session v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `a1` is never read
[INFO] [stderr]   --> src/lesson_1.rs:16:13
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let mut a1: i32 = 1;
[INFO] [stderr]    |             ^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.02s
[INFO] running `"docker" "inspect" "95a71eb50b2536a8145c1ac41f4c3d89441f508f27fecd5766464b8d3e0e1271"`
[INFO] running `"docker" "rm" "-f" "95a71eb50b2536a8145c1ac41f4c3d89441f508f27fecd5766464b8d3e0e1271"`
[INFO] [stdout] 95a71eb50b2536a8145c1ac41f4c3d89441f508f27fecd5766464b8d3e0e1271
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vijaysharmay/rust-session-part-1:/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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 0638134da3c159318207edf7128809e958d8d064ec6e55258c919885d39e201d
[INFO] running `"docker" "start" "-a" "0638134da3c159318207edf7128809e958d8d064ec6e55258c919885d39e201d"`
[INFO] [stderr]    Compiling rust-techtonic-session v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `a1` is never read
[INFO] [stderr]   --> src/lesson_1.rs:16:13
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let mut a1: i32 = 1;
[INFO] [stderr]    |             ^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.90s
[INFO] running `"docker" "inspect" "0638134da3c159318207edf7128809e958d8d064ec6e55258c919885d39e201d"`
[INFO] running `"docker" "rm" "-f" "0638134da3c159318207edf7128809e958d8d064ec6e55258c919885d39e201d"`
[INFO] [stdout] 0638134da3c159318207edf7128809e958d8d064ec6e55258c919885d39e201d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vijaysharmay/rust-session-part-1:/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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 725dc501f8cf0857b5093ec5c6b824439e248adfc79e0d4efed867e0f75cfd96
[INFO] running `"docker" "start" "-a" "725dc501f8cf0857b5093ec5c6b824439e248adfc79e0d4efed867e0f75cfd96"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_techtonic_session-6164ed0d6902307c
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "725dc501f8cf0857b5093ec5c6b824439e248adfc79e0d4efed867e0f75cfd96"`
[INFO] running `"docker" "rm" "-f" "725dc501f8cf0857b5093ec5c6b824439e248adfc79e0d4efed867e0f75cfd96"`
[INFO] [stdout] 725dc501f8cf0857b5093ec5c6b824439e248adfc79e0d4efed867e0f75cfd96