[INFO] updating cached repository nmhanson/maze_game
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/nmhanson/maze_game
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/nmhanson/maze_game" "work/ex/beta-1.38-1/sources/1.37.0/gh/nmhanson/maze_game"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/nmhanson/maze_game'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/nmhanson/maze_game" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/nmhanson/maze_game"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/nmhanson/maze_game'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 879cfc78c93360ac0e8e0c40e1458f45a04bc672
[INFO] sha for GitHub repo nmhanson/maze_game: 879cfc78c93360ac0e8e0c40e1458f45a04bc672
[INFO] validating manifest of nmhanson/maze_game 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 nmhanson/maze_game 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 nmhanson/maze_game
[INFO] finished frobbing nmhanson/maze_game
[INFO] frobbed toml for nmhanson/maze_game written to work/ex/beta-1.38-1/sources/1.37.0/gh/nmhanson/maze_game/Cargo.toml
[INFO] started frobbing nmhanson/maze_game
[INFO] finished frobbing nmhanson/maze_game
[INFO] frobbed toml for nmhanson/maze_game written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/nmhanson/maze_game/Cargo.toml
[INFO] crate nmhanson/maze_game 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 nmhanson/maze_game 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-5/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/nmhanson/maze_game:/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] 11bb2e477d8b30bc0cafb79d330d094b3e3e04d071122859c38ad5c67f3eefca
[INFO] running `"docker" "start" "-a" "11bb2e477d8b30bc0cafb79d330d094b3e3e04d071122859c38ad5c67f3eefca"`
[INFO] [stderr]    Compiling maze_game v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead?
[INFO] [stderr]  --> src/world.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | extern crate rand;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: for more information, see https://github.com/rust-lang/rust/issues/27812
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead?
[INFO] [stderr]  --> src/world.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use self::rand::Rng;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: for more information, see https://github.com/rust-lang/rust/issues/27812
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead?
[INFO] [stderr]   --> src/world.rs:24:17
[INFO] [stderr]    |
[INFO] [stderr] 24 |         let x = rand::thread_rng().gen_range( 1, WORLD_MAX_X - 1 );
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/27812
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead?
[INFO] [stderr]   --> src/world.rs:25:17
[INFO] [stderr]    |
[INFO] [stderr] 25 |         let y = rand::thread_rng().gen_range( 1, WORLD_MAX_Y - 1 );
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/27812
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead?
[INFO] [stderr]   --> src/world.rs:46:21
[INFO] [stderr]    |
[INFO] [stderr] 46 |         let width = rand::thread_rng().gen_range( MIN_ROOM_WIDTH, MAX_ROOM_WIDTH );
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/27812
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead?
[INFO] [stderr]   --> src/world.rs:47:22
[INFO] [stderr]    |
[INFO] [stderr] 47 |         let height = rand::thread_rng().gen_range( MIN_ROOM_HEIGHT, MAX_ROOM_HEIGHT );
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/27812
[INFO] [stderr] 
[INFO] [stderr] error[E0261]: use of undeclared lifetime name `'a`
[INFO] [stderr]   --> src/world.rs:77:12
[INFO] [stderr]    |
[INFO] [stderr] 77 | impl World<'a> {
[INFO] [stderr]    |            ^^ undeclared lifetime
[INFO] [stderr] 
[INFO] [stderr] error[E0261]: use of undeclared lifetime name `'a`
[INFO] [stderr]   --> src/world.rs:80:35
[INFO] [stderr]    |
[INFO] [stderr] 80 |     pub fn build_world() -> World<'a> {
[INFO] [stderr]    |                                   ^^ undeclared lifetime
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 8 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0261, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0261`.
[INFO] [stderr] error: Could not compile `maze_game`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "11bb2e477d8b30bc0cafb79d330d094b3e3e04d071122859c38ad5c67f3eefca"`
[INFO] running `"docker" "rm" "-f" "11bb2e477d8b30bc0cafb79d330d094b3e3e04d071122859c38ad5c67f3eefca"`
[INFO] [stdout] 11bb2e477d8b30bc0cafb79d330d094b3e3e04d071122859c38ad5c67f3eefca