[INFO] updating cached repository sirlag/ISBN
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/sirlag/ISBN
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/sirlag/ISBN" "work/ex/beta-1.37-6/sources/1.36.0/gh/sirlag/ISBN"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/sirlag/ISBN'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/sirlag/ISBN" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/sirlag/ISBN"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/sirlag/ISBN'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f6da158bd5ceca36fac4cc5fb747d13fe87b104a
[INFO] sha for GitHub repo sirlag/ISBN: f6da158bd5ceca36fac4cc5fb747d13fe87b104a
[INFO] validating manifest of sirlag/ISBN on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of sirlag/ISBN on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing sirlag/ISBN
[INFO] finished frobbing sirlag/ISBN
[INFO] frobbed toml for sirlag/ISBN written to work/ex/beta-1.37-6/sources/1.36.0/gh/sirlag/ISBN/Cargo.toml
[INFO] started frobbing sirlag/ISBN
[INFO] finished frobbing sirlag/ISBN
[INFO] frobbed toml for sirlag/ISBN written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/sirlag/ISBN/Cargo.toml
[INFO] crate sirlag/ISBN already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing sirlag/ISBN against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/sirlag/ISBN:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 66a564b29c411a9bd8f40a7df2f1b5ae4a51bb956e0b4e25cfa8daca77f8df5f
[INFO] running `"docker" "start" "-a" "66a564b29c411a9bd8f40a7df2f1b5ae4a51bb956e0b4e25cfa8daca77f8df5f"`
[INFO] [stderr]    Compiling ISBN v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `std::rand`
[INFO] [stderr]  --> src/main.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::rand;
[INFO] [stderr]   |     ^^^^^^^^^ no `rand` in the root
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `args` in module `os`
[INFO] [stderr]  --> src/main.rs:8:20
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let args = os::args();
[INFO] [stderr]   |                    ^^^^ not found in `os`
[INFO] [stderr] help: possible candidate is found in another module, you can import it into scope
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::env::args;
[INFO] [stderr]   |
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]   --> src/main.rs:76:18
[INFO] [stderr]    |
[INFO] [stderr] 76 |     for mut x in (0..length-1){
[INFO] [stderr]    |                  ^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0425, E0432.
[INFO] [stderr] For more information about an error, try `rustc --explain E0425`.
[INFO] [stderr] error: Could not compile `ISBN`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "66a564b29c411a9bd8f40a7df2f1b5ae4a51bb956e0b4e25cfa8daca77f8df5f"`
[INFO] running `"docker" "rm" "-f" "66a564b29c411a9bd8f40a7df2f1b5ae4a51bb956e0b4e25cfa8daca77f8df5f"`
[INFO] [stdout] 66a564b29c411a9bd8f40a7df2f1b5ae4a51bb956e0b4e25cfa8daca77f8df5f