[INFO] updating cached repository akr4/monkey-rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/akr4/monkey-rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/akr4/monkey-rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/akr4/monkey-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/akr4/monkey-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/akr4/monkey-rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/akr4/monkey-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/akr4/monkey-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] fab276752b07c9c76a648d8ee5f319a5c43be652
[INFO] sha for GitHub repo akr4/monkey-rust: fab276752b07c9c76a648d8ee5f319a5c43be652
[INFO] validating manifest of akr4/monkey-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 akr4/monkey-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 akr4/monkey-rust
[INFO] finished frobbing akr4/monkey-rust
[INFO] frobbed toml for akr4/monkey-rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/akr4/monkey-rust/Cargo.toml
[INFO] started frobbing akr4/monkey-rust
[INFO] finished frobbing akr4/monkey-rust
[INFO] frobbed toml for akr4/monkey-rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/akr4/monkey-rust/Cargo.toml
[INFO] crate akr4/monkey-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] testing akr4/monkey-rust 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/akr4/monkey-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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] b2727142f54940b4aa56fe96a68ca44e0b5eb82fbdd43c01c8e2c979a124feda
[INFO] running `"docker" "start" "-a" "b2727142f54940b4aa56fe96a68ca44e0b5eb82fbdd43c01c8e2c979a124feda"`
[INFO] [stderr]    Compiling monkey-rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/repl.rs:19:21
[INFO] [stderr]    |
[INFO] [stderr] 19 |                     writeln!(write, "{:?}", token);
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.42s
[INFO] running `"docker" "inspect" "b2727142f54940b4aa56fe96a68ca44e0b5eb82fbdd43c01c8e2c979a124feda"`
[INFO] running `"docker" "rm" "-f" "b2727142f54940b4aa56fe96a68ca44e0b5eb82fbdd43c01c8e2c979a124feda"`
[INFO] [stdout] b2727142f54940b4aa56fe96a68ca44e0b5eb82fbdd43c01c8e2c979a124feda
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/akr4/monkey-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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] bfaea29039b0dd76cf66cc6d86564c3257ff653a1fb0ed35fa18ff39b0db76c4
[INFO] running `"docker" "start" "-a" "bfaea29039b0dd76cf66cc6d86564c3257ff653a1fb0ed35fa18ff39b0db76c4"`
[INFO] [stderr]    Compiling monkey-rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/repl.rs:19:21
[INFO] [stderr]    |
[INFO] [stderr] 19 |                     writeln!(write, "{:?}", token);
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.53s
[INFO] running `"docker" "inspect" "bfaea29039b0dd76cf66cc6d86564c3257ff653a1fb0ed35fa18ff39b0db76c4"`
[INFO] running `"docker" "rm" "-f" "bfaea29039b0dd76cf66cc6d86564c3257ff653a1fb0ed35fa18ff39b0db76c4"`
[INFO] [stdout] bfaea29039b0dd76cf66cc6d86564c3257ff653a1fb0ed35fa18ff39b0db76c4
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/akr4/monkey-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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 620903c9265102787ca6a6ae58602148baa2b7b97b006897b79113615f1e5c25
[INFO] running `"docker" "start" "-a" "620903c9265102787ca6a6ae58602148baa2b7b97b006897b79113615f1e5c25"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/monkey_rust-7274dbe29900d39d
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test lexer_test::test_next_token ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "620903c9265102787ca6a6ae58602148baa2b7b97b006897b79113615f1e5c25"`
[INFO] running `"docker" "rm" "-f" "620903c9265102787ca6a6ae58602148baa2b7b97b006897b79113615f1e5c25"`
[INFO] [stdout] 620903c9265102787ca6a6ae58602148baa2b7b97b006897b79113615f1e5c25