[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-58592/sources/master#f66e4697ae286985ddefc53c3a047614568458bb/gh/BenjaminGuenin/rust-programming-tutorial"`
[INFO] [stderr] Cloning into 'work/ex/pr-58592/sources/master#f66e4697ae286985ddefc53c3a047614568458bb/gh/BenjaminGuenin/rust-programming-tutorial'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/BenjaminGuenin/rust-programming-tutorial" "work/ex/pr-58592/sources/try#c3b22200e6f5b70eb1f99ae6944d989ae17a458a/gh/BenjaminGuenin/rust-programming-tutorial"`
[INFO] [stderr] Cloning into 'work/ex/pr-58592/sources/try#c3b22200e6f5b70eb1f99ae6944d989ae17a458a/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#f66e4697ae286985ddefc53c3a047614568458bb
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+f66e4697ae286985ddefc53c3a047614568458bb-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of BenjaminGuenin/rust-programming-tutorial on toolchain try#c3b22200e6f5b70eb1f99ae6944d989ae17a458a
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c3b22200e6f5b70eb1f99ae6944d989ae17a458a-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-58592/sources/master#f66e4697ae286985ddefc53c3a047614568458bb/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-58592/sources/try#c3b22200e6f5b70eb1f99ae6944d989ae17a458a/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" "+f66e4697ae286985ddefc53c3a047614568458bb-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c3b22200e6f5b70eb1f99ae6944d989ae17a458a-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking BenjaminGuenin/rust-programming-tutorial against master#f66e4697ae286985ddefc53c3a047614568458bb for pr-58592
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-58592/worker-6/master#f66e4697ae286985ddefc53c3a047614568458bb:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-58592/sources/master#f66e4697ae286985ddefc53c3a047614568458bb/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" "+f66e4697ae286985ddefc53c3a047614568458bb-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 3ee4f6237d779b869fc6c843435fddaad1690fd08dfb2dff1e0b0473cc7a0bd5
[INFO] running `"docker" "start" "-a" "3ee4f6237d779b869fc6c843435fddaad1690fd08dfb2dff1e0b0473cc7a0bd5"`
[INFO] [stderr]     Checking 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] 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 0.30s
[INFO] running `"docker" "inspect" "3ee4f6237d779b869fc6c843435fddaad1690fd08dfb2dff1e0b0473cc7a0bd5"`
[INFO] running `"docker" "rm" "-f" "3ee4f6237d779b869fc6c843435fddaad1690fd08dfb2dff1e0b0473cc7a0bd5"`
[INFO] [stdout] 3ee4f6237d779b869fc6c843435fddaad1690fd08dfb2dff1e0b0473cc7a0bd5