[INFO] cloning repository https://github.com/itssaptarshi/rust_book
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/itssaptarshi/rust_book" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fitssaptarshi%2Frust_book", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fitssaptarshi%2Frust_book'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f87db7b5877336b0b1cef66d52c1f5ad72d296f8
[INFO] checking itssaptarshi/rust_book against try#c9557a20e5ef2e0e02c29a5fafd850d1b7cf1e4f for 2025-12-16-next-solver-global
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fitssaptarshi%2Frust_book" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/itssaptarshi/rust_book
[INFO] finished tweaking git repo https://github.com/itssaptarshi/rust_book
[INFO] tweaked toml for git repo https://github.com/itssaptarshi/rust_book written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/itssaptarshi/rust_book on toolchain c9557a20e5ef2e0e02c29a5fafd850d1b7cf1e4f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c9557a20e5ef2e0e02c29a5fafd850d1b7cf1e4f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/itssaptarshi/rust_book already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c9557a20e5ef2e0e02c29a5fafd850d1b7cf1e4f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+c9557a20e5ef2e0e02c29a5fafd850d1b7cf1e4f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4424639cff4ab313264dad779ecd91239c2872b523f6a7c7398103b330c9616e
[INFO] running `Command { std: "docker" "start" "-a" "4424639cff4ab313264dad779ecd91239c2872b523f6a7c7398103b330c9616e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4424639cff4ab313264dad779ecd91239c2872b523f6a7c7398103b330c9616e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4424639cff4ab313264dad779ecd91239c2872b523f6a7c7398103b330c9616e", kill_on_drop: false }`
[INFO] [stdout] 4424639cff4ab313264dad779ecd91239c2872b523f6a7c7398103b330c9616e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+c9557a20e5ef2e0e02c29a5fafd850d1b7cf1e4f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b4242edfb3aeac1eb12eefb095aa999fd0ac9f48d261f13ea9feea3c444386f6
[INFO] running `Command { std: "docker" "start" "-a" "b4242edfb3aeac1eb12eefb095aa999fd0ac9f48d261f13ea9feea3c444386f6", kill_on_drop: false }`
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking colored v2.0.4
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking rust_book v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0583]: file not found for module `ownership`
[INFO] [stdout]  --> src/main.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | mod ownership;
[INFO] [stdout]   | ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: to create the module `ownership`, create file "src/ownership.rs" or "src/ownership/mod.rs"
[INFO] [stdout]   = note: if there is a `mod ownership` elsewhere in the crate already, import it with `use crate::...` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0583]: file not found for module `ownership`
[INFO] [stdout]  --> src/main.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | mod ownership;
[INFO] [stdout]   | ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: to create the module `ownership`, create file "src/ownership.rs" or "src/ownership/mod.rs"
[INFO] [stdout]   = note: if there is a `mod ownership` elsewhere in the crate already, import it with `use crate::...` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/common_programming_concepts.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let a = 5;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/common_programming_concepts.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let b = 2.5;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/common_programming_concepts.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let c = 0xff;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]   --> src/common_programming_concepts.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let sum = 5 + 10;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sub`
[INFO] [stdout]   --> src/common_programming_concepts.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let sub = 10 - 5;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sub`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mul`
[INFO] [stdout]   --> src/common_programming_concepts.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let mul = 10 * 5;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_mul`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `div`
[INFO] [stdout]   --> src/common_programming_concepts.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let div = 10 / 5;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_div`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `char`
[INFO] [stdout]   --> src/common_programming_concepts.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let char = 'a';
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_char`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `stringb`
[INFO] [stdout]   --> src/common_programming_concepts.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let stringb = "hello";
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_stringb`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `age`
[INFO] [stdout]   --> src/common_programming_concepts.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let age = tup.1;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_age`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0583`.
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/common_programming_concepts.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let a = 5;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/common_programming_concepts.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let b = 2.5;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/common_programming_concepts.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let c = 0xff;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]   --> src/common_programming_concepts.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let sum = 5 + 10;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sub`
[INFO] [stdout]   --> src/common_programming_concepts.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let sub = 10 - 5;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sub`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mul`
[INFO] [stdout]   --> src/common_programming_concepts.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let mul = 10 * 5;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_mul`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `div`
[INFO] [stdout]   --> src/common_programming_concepts.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let div = 10 / 5;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_div`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `char`
[INFO] [stdout]   --> src/common_programming_concepts.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let char = 'a';
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_char`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `stringb`
[INFO] [stdout]   --> src/common_programming_concepts.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let stringb = "hello";
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_stringb`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `age`
[INFO] [stdout]   --> src/common_programming_concepts.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let age = tup.1;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_age`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0583`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_book` (bin "rust_book") due to 1 previous error; 10 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `rust_book` (bin "rust_book" test) due to 1 previous error; 10 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "b4242edfb3aeac1eb12eefb095aa999fd0ac9f48d261f13ea9feea3c444386f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4242edfb3aeac1eb12eefb095aa999fd0ac9f48d261f13ea9feea3c444386f6", kill_on_drop: false }`
[INFO] [stdout] b4242edfb3aeac1eb12eefb095aa999fd0ac9f48d261f13ea9feea3c444386f6