[INFO] updating cached repository BenjaminGuenin/rust-programming-tutorial
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/BenjaminGuenin/rust-programming-tutorial
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/BenjaminGuenin/rust-programming-tutorial" "work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/BenjaminGuenin/rust-programming-tutorial"`
[INFO] [stderr] Cloning into 'work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/BenjaminGuenin/rust-programming-tutorial'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/BenjaminGuenin/rust-programming-tutorial" "work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/gh/BenjaminGuenin/rust-programming-tutorial"`
[INFO] [stderr] Cloning into 'work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/gh/BenjaminGuenin/rust-programming-tutorial'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1c2bd68e28b9b496e1604e619e56fab798015000
[INFO] sha for GitHub repo BenjaminGuenin/rust-programming-tutorial: 1c2bd68e28b9b496e1604e619e56fab798015000
[INFO] validating manifest of BenjaminGuenin/rust-programming-tutorial on toolchain master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of BenjaminGuenin/rust-programming-tutorial on toolchain try#7fea0229842e79db1159ea58ad9a653b288efee9
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+7fea0229842e79db1159ea58ad9a653b288efee9-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing BenjaminGuenin/rust-programming-tutorial
[INFO] finished frobbing BenjaminGuenin/rust-programming-tutorial
[INFO] frobbed toml for BenjaminGuenin/rust-programming-tutorial written to work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/BenjaminGuenin/rust-programming-tutorial/Cargo.toml
[INFO] started frobbing BenjaminGuenin/rust-programming-tutorial
[INFO] finished frobbing BenjaminGuenin/rust-programming-tutorial
[INFO] frobbed toml for BenjaminGuenin/rust-programming-tutorial written to work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/gh/BenjaminGuenin/rust-programming-tutorial/Cargo.toml
[INFO] crate BenjaminGuenin/rust-programming-tutorial has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+7fea0229842e79db1159ea58ad9a653b288efee9-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing BenjaminGuenin/rust-programming-tutorial against master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54 for pr-57967
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57967/worker-5/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/BenjaminGuenin/rust-programming-tutorial:/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=forbid" "-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" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "build" "--frozen"`
[INFO] [stdout] b497f0ec79d7c806d9f49812363fa666f569b4c0368259ee8c5e2be11bd10529
[INFO] running `"docker" "start" "-a" "b497f0ec79d7c806d9f49812363fa666f569b4c0368259ee8c5e2be11bd10529"`
[INFO] [stderr]    Compiling rust-programming-tutorial v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `immutable_string`
[INFO] [stderr]  --> src/main.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let immutable_string = "hello"; // cannot be modified - stored on the stack
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_immutable_string`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/main.rs:11:13
[INFO] [stderr]    |
[INFO] [stderr] 11 |         let s = String::from("hello"); // s is valid from this point forward
[INFO] [stderr]    |             ^ help: consider prefixing with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.46s
[INFO] running `"docker" "inspect" "b497f0ec79d7c806d9f49812363fa666f569b4c0368259ee8c5e2be11bd10529"`
[INFO] running `"docker" "rm" "-f" "b497f0ec79d7c806d9f49812363fa666f569b4c0368259ee8c5e2be11bd10529"`
[INFO] [stdout] b497f0ec79d7c806d9f49812363fa666f569b4c0368259ee8c5e2be11bd10529
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57967/worker-5/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/BenjaminGuenin/rust-programming-tutorial:/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=forbid" "-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" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "test" "--frozen" "--no-run"`
[INFO] [stdout] ee9068d0265c0eb305f33793fd031579913e5ff6c3fe37703ef879523df40eac
[INFO] running `"docker" "start" "-a" "ee9068d0265c0eb305f33793fd031579913e5ff6c3fe37703ef879523df40eac"`
[INFO] [stderr]    Compiling rust-programming-tutorial v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `immutable_string`
[INFO] [stderr]  --> src/main.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let immutable_string = "hello"; // cannot be modified - stored on the stack
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_immutable_string`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/main.rs:11:13
[INFO] [stderr]    |
[INFO] [stderr] 11 |         let s = String::from("hello"); // s is valid from this point forward
[INFO] [stderr]    |             ^ help: consider prefixing with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.46s
[INFO] running `"docker" "inspect" "ee9068d0265c0eb305f33793fd031579913e5ff6c3fe37703ef879523df40eac"`
[INFO] running `"docker" "rm" "-f" "ee9068d0265c0eb305f33793fd031579913e5ff6c3fe37703ef879523df40eac"`
[INFO] [stdout] ee9068d0265c0eb305f33793fd031579913e5ff6c3fe37703ef879523df40eac
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57967/worker-5/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/BenjaminGuenin/rust-programming-tutorial:/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=forbid" "-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" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "test" "--frozen"`
[INFO] [stdout] 6a11e8633014674848b6e5f2678476b4d5dd4d57494f44a54cbc5a8feb618459
[INFO] running `"docker" "start" "-a" "6a11e8633014674848b6e5f2678476b4d5dd4d57494f44a54cbc5a8feb618459"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_programming_tutorial-ab903ab72d943f5a
[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" "6a11e8633014674848b6e5f2678476b4d5dd4d57494f44a54cbc5a8feb618459"`
[INFO] running `"docker" "rm" "-f" "6a11e8633014674848b6e5f2678476b4d5dd4d57494f44a54cbc5a8feb618459"`
[INFO] [stdout] 6a11e8633014674848b6e5f2678476b4d5dd4d57494f44a54cbc5a8feb618459