[INFO] updating cached repository nick-lehmann/-Rust-Book
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/nick-lehmann/-Rust-Book
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/nick-lehmann/-Rust-Book" "work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/nick-lehmann/-Rust-Book"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/nick-lehmann/-Rust-Book'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/nick-lehmann/-Rust-Book" "work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/nick-lehmann/-Rust-Book"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/nick-lehmann/-Rust-Book'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e1bcab8cfad3181d6edc237f03944024a5e44e77
[INFO] sha for GitHub repo nick-lehmann/-Rust-Book: e1bcab8cfad3181d6edc237f03944024a5e44e77
[INFO] validating manifest of nick-lehmann/-Rust-Book on toolchain master#60960a260f7b5c695fd0717311d72ce62dd4eb43
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of nick-lehmann/-Rust-Book on toolchain try#266783e4e09e4e9d5307c1c8e695659c58bbcac7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing nick-lehmann/-Rust-Book
[INFO] finished frobbing nick-lehmann/-Rust-Book
[INFO] frobbed toml for nick-lehmann/-Rust-Book written to work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/nick-lehmann/-Rust-Book/Cargo.toml
[INFO] started frobbing nick-lehmann/-Rust-Book
[INFO] finished frobbing nick-lehmann/-Rust-Book
[INFO] frobbed toml for nick-lehmann/-Rust-Book written to work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/nick-lehmann/-Rust-Book/Cargo.toml
[INFO] crate nick-lehmann/-Rust-Book already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking nick-lehmann/-Rust-Book against try#266783e4e09e4e9d5307c1c8e695659c58bbcac7 for pr-63376
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63376/worker-6/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/nick-lehmann/-Rust-Book:/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" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 72b72b6426404aa5c7e038a79fb3d0590e2d0b7bbd8879a01e3af45b680c4a2d
[INFO] running `"docker" "start" "-a" "72b72b6426404aa5c7e038a79fb3d0590e2d0b7bbd8879a01e3af45b680c4a2d"`
[INFO] [stderr]     Checking ndarray v0.12.1
[INFO] [stderr]     Checking Rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/bin/formatting.rs:5:5
[INFO] [stderr]    |
[INFO] [stderr] 5  | /     /// Example function showing the different kinds strings can
[INFO] [stderr] 6  | |     /// be formatted and printed in Rust.
[INFO] [stderr] 7  | |     ///
[INFO] [stderr] 8  | |     /// Printing and formatting is mainly handled by a variety of marcors in std:fmt.
[INFO] [stderr] ...  |
[INFO] [stderr] 25 | |     /// count := parameter | integer
[INFO] [stderr] 26 | |     /// parameter := argument '$'
[INFO] [stderr]    | |_________________________________^
[INFO] [stderr] ...
[INFO] [stderr] 29 |       println!("{} days", 31);
[INFO] [stderr]    |       ------------------------ rustdoc does not generate documentation for macro expansions
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/bin/formatting.rs:5:5
[INFO] [stderr]    |
[INFO] [stderr] 5  | /     /// Example function showing the different kinds strings can
[INFO] [stderr] 6  | |     /// be formatted and printed in Rust.
[INFO] [stderr] 7  | |     ///
[INFO] [stderr] 8  | |     /// Printing and formatting is mainly handled by a variety of marcors in std:fmt.
[INFO] [stderr] ...  |
[INFO] [stderr] 25 | |     /// count := parameter | integer
[INFO] [stderr] 26 | |     /// parameter := argument '$'
[INFO] [stderr]    | |_________________________________^
[INFO] [stderr] ...
[INFO] [stderr] 29 |       println!("{} days", 31);
[INFO] [stderr]    |       ------------------------ rustdoc does not generate documentation for macro expansions
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `peter`
[INFO] [stderr]   --> src/main.rs:36:9
[INFO] [stderr]    |
[INFO] [stderr] 36 |     let peter = Person { name, age };
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_peter`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Nil`
[INFO] [stderr]  --> src/main.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | struct Nil;
[INFO] [stderr]   | ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Rectangle`
[INFO] [stderr]   --> src/main.rs:20:1
[INFO] [stderr]    |
[INFO] [stderr] 20 | struct Rectangle {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: crate `Rust` should have a snake case name
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr]   = help: convert the identifier to snake case: `rust`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `peter`
[INFO] [stderr]   --> src/main.rs:36:9
[INFO] [stderr]    |
[INFO] [stderr] 36 |     let peter = Person { name, age };
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_peter`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Nil`
[INFO] [stderr]  --> src/main.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | struct Nil;
[INFO] [stderr]   | ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Rectangle`
[INFO] [stderr]   --> src/main.rs:20:1
[INFO] [stderr]    |
[INFO] [stderr] 20 | struct Rectangle {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: crate `Rust` should have a snake case name
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr]   = help: convert the identifier to snake case: `rust`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.82s
[INFO] running `"docker" "inspect" "72b72b6426404aa5c7e038a79fb3d0590e2d0b7bbd8879a01e3af45b680c4a2d"`
[INFO] running `"docker" "rm" "-f" "72b72b6426404aa5c7e038a79fb3d0590e2d0b7bbd8879a01e3af45b680c4a2d"`
[INFO] [stdout] 72b72b6426404aa5c7e038a79fb3d0590e2d0b7bbd8879a01e3af45b680c4a2d