[INFO] updating cached repository Qwertee/Rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Qwertee/Rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Qwertee/Rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/Qwertee/Rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Qwertee/Rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Qwertee/Rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Qwertee/Rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Qwertee/Rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c2c0f36e776e9f67457d46f3449a716ad4a7b1fe
[INFO] sha for GitHub repo Qwertee/Rust: c2c0f36e776e9f67457d46f3449a716ad4a7b1fe
[INFO] validating manifest of Qwertee/Rust 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 Qwertee/Rust 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 Qwertee/Rust
[INFO] finished frobbing Qwertee/Rust
[INFO] frobbed toml for Qwertee/Rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/Qwertee/Rust/Cargo.toml
[INFO] started frobbing Qwertee/Rust
[INFO] finished frobbing Qwertee/Rust
[INFO] frobbed toml for Qwertee/Rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Qwertee/Rust/Cargo.toml
[INFO] crate Qwertee/Rust 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing Qwertee/Rust 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/Qwertee/Rust:/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] 815b3ccb4082e7802b6ab6dba32288cd6fd6b9042be9b7526a1fe9eddc221164
[INFO] running `"docker" "start" "-a" "815b3ccb4082e7802b6ab6dba32288cd6fd6b9042be9b7526a1fe9eddc221164"`
[INFO] [stderr]    Compiling learn_rust v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] error: expected one of `.`, `;`, `?`, or an operator, found `let`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     let b = [0; 20]    // b: [i32; 20]
[INFO] [stderr]   |                    - help: a semicolon may be missing here
[INFO] [stderr] 6 | 
[INFO] [stderr] 7 |     let c: (i32, &str) = (1, "Hello");  // tuple
[INFO] [stderr]   |     ^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `learn_rust`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "815b3ccb4082e7802b6ab6dba32288cd6fd6b9042be9b7526a1fe9eddc221164"`
[INFO] running `"docker" "rm" "-f" "815b3ccb4082e7802b6ab6dba32288cd6fd6b9042be9b7526a1fe9eddc221164"`
[INFO] [stdout] 815b3ccb4082e7802b6ab6dba32288cd6fd6b9042be9b7526a1fe9eddc221164