[INFO] cloning repository d-silvas/intro-to-rust
[INFO] running `"git" "clone" "--bare" "git://github.com/d-silvas/intro-to-rust.git" "work/cache/sources/gh/d-silvas/intro-to-rust"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/d-silvas/intro-to-rust'...
[INFO] running `"git" "clone" "work/cache/sources/gh/d-silvas/intro-to-rust" "work/ex/beta-1.37-6/sources/1.36.0/gh/d-silvas/intro-to-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/d-silvas/intro-to-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/d-silvas/intro-to-rust" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/d-silvas/intro-to-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/d-silvas/intro-to-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c3bfa0461d1eb0474a22312c85e57430c1839c5e
[INFO] sha for GitHub repo d-silvas/intro-to-rust: c3bfa0461d1eb0474a22312c85e57430c1839c5e
[INFO] validating manifest of d-silvas/intro-to-rust 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 d-silvas/intro-to-rust 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 d-silvas/intro-to-rust
[INFO] finished frobbing d-silvas/intro-to-rust
[INFO] frobbed toml for d-silvas/intro-to-rust written to work/ex/beta-1.37-6/sources/1.36.0/gh/d-silvas/intro-to-rust/Cargo.toml
[INFO] started frobbing d-silvas/intro-to-rust
[INFO] finished frobbing d-silvas/intro-to-rust
[INFO] frobbed toml for d-silvas/intro-to-rust written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/d-silvas/intro-to-rust/Cargo.toml
[INFO] crate d-silvas/intro-to-rust 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 d-silvas/intro-to-rust 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-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/d-silvas/intro-to-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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 5c649955232e13cd3739d9d82e2f9723596f081d2107cd49a1374b4b7e3b273b
[INFO] running `"docker" "start" "-a" "5c649955232e13cd3739d9d82e2f9723596f081d2107cd49a1374b4b7e3b273b"`
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]    Compiling intro-to-rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]  --> src/main.rs:7:7
[INFO] [stderr]   |
[INFO] [stderr] 7 |   let x = 1;
[INFO] [stderr]   |       ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]   --> src/main.rs:27:7
[INFO] [stderr]    |
[INFO] [stderr] 27 |   let z = &y;
[INFO] [stderr]    |       ^ help: consider prefixing with an underscore: `_z`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.24s
[INFO] running `"docker" "inspect" "5c649955232e13cd3739d9d82e2f9723596f081d2107cd49a1374b4b7e3b273b"`
[INFO] running `"docker" "rm" "-f" "5c649955232e13cd3739d9d82e2f9723596f081d2107cd49a1374b4b7e3b273b"`
[INFO] [stdout] 5c649955232e13cd3739d9d82e2f9723596f081d2107cd49a1374b4b7e3b273b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/d-silvas/intro-to-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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 32dbe72b3e6bac286b9aed49a0df169d4293d7b7e445d5393b8557c5546c38fb
[INFO] running `"docker" "start" "-a" "32dbe72b3e6bac286b9aed49a0df169d4293d7b7e445d5393b8557c5546c38fb"`
[INFO] [stderr]    Compiling intro-to-rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]  --> src/main.rs:7:7
[INFO] [stderr]   |
[INFO] [stderr] 7 |   let x = 1;
[INFO] [stderr]   |       ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]   --> src/main.rs:27:7
[INFO] [stderr]    |
[INFO] [stderr] 27 |   let z = &y;
[INFO] [stderr]    |       ^ help: consider prefixing with an underscore: `_z`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.82s
[INFO] running `"docker" "inspect" "32dbe72b3e6bac286b9aed49a0df169d4293d7b7e445d5393b8557c5546c38fb"`
[INFO] running `"docker" "rm" "-f" "32dbe72b3e6bac286b9aed49a0df169d4293d7b7e445d5393b8557c5546c38fb"`
[INFO] [stdout] 32dbe72b3e6bac286b9aed49a0df169d4293d7b7e445d5393b8557c5546c38fb
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/d-silvas/intro-to-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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] 6f222ea39a57cc007c131d03a10b0105f87a64a4aeba9ff7721b19b8e7d07487
[INFO] running `"docker" "start" "-a" "6f222ea39a57cc007c131d03a10b0105f87a64a4aeba9ff7721b19b8e7d07487"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/intro_to_rust-9550e2f4a9a11f10
[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" "6f222ea39a57cc007c131d03a10b0105f87a64a4aeba9ff7721b19b8e7d07487"`
[INFO] running `"docker" "rm" "-f" "6f222ea39a57cc007c131d03a10b0105f87a64a4aeba9ff7721b19b8e7d07487"`
[INFO] [stdout] 6f222ea39a57cc007c131d03a10b0105f87a64a4aeba9ff7721b19b8e7d07487