[INFO] fetching crate muto 0.1.0...
[INFO] testing muto-0.1.0 against master#cdb45c87e2cd43495379f7e867e3cc15dcee9f93 for pr-145838-1
[INFO] extracting crate muto 0.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate muto 0.1.0
[INFO] finished tweaking crates.io crate muto 0.1.0
[INFO] tweaked toml for crates.io crate muto 0.1.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate muto 0.1.0 on toolchain cdb45c87e2cd43495379f7e867e3cc15dcee9f93
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate muto 0.1.0 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" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cc47a507f41e7b8af15297d2fc90ad7945028fafaf4fef86de2210644e35326d
[INFO] running `Command { std: "docker" "start" "-a" "cc47a507f41e7b8af15297d2fc90ad7945028fafaf4fef86de2210644e35326d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cc47a507f41e7b8af15297d2fc90ad7945028fafaf4fef86de2210644e35326d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cc47a507f41e7b8af15297d2fc90ad7945028fafaf4fef86de2210644e35326d", kill_on_drop: false }`
[INFO] [stdout] cc47a507f41e7b8af15297d2fc90ad7945028fafaf4fef86de2210644e35326d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 36e1f55ea95a08c4e6bb7c93eab855f5d09862aefb9fb54fc121384028432daa
[INFO] running `Command { std: "docker" "start" "-a" "36e1f55ea95a08c4e6bb7c93eab855f5d09862aefb9fb54fc121384028432daa", kill_on_drop: false }`
[INFO] [stderr]    Compiling muto v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::mem::take`
[INFO] [stdout]   --> src/lib.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::mem::take;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `prev_task` and `next_task` are never read
[INFO] [stdout]    --> src/lib.rs:236:2
[INFO] [stdout]     |
[INFO] [stdout] 235 | struct InsertionData {
[INFO] [stdout]     |        ------------- fields in this struct
[INFO] [stdout] 236 |     prev_task: Task,
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout] 237 |     next_task: Task,
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `InsertionData` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `solutions`
[INFO] [stdout]   --> src/main.rs:38:6
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let solutions = muto.solve();
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_solutions`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.36s
[INFO] running `Command { std: "docker" "inspect" "36e1f55ea95a08c4e6bb7c93eab855f5d09862aefb9fb54fc121384028432daa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "36e1f55ea95a08c4e6bb7c93eab855f5d09862aefb9fb54fc121384028432daa", kill_on_drop: false }`
[INFO] [stdout] 36e1f55ea95a08c4e6bb7c93eab855f5d09862aefb9fb54fc121384028432daa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2203d39bfd731d7917383a0cbe378ac1bc14e78e96c84ceb6fa63a543ff4adfb
[INFO] running `Command { std: "docker" "start" "-a" "2203d39bfd731d7917383a0cbe378ac1bc14e78e96c84ceb6fa63a543ff4adfb", kill_on_drop: false }`
[INFO] [stderr]    Compiling muto v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::mem::take`
[INFO] [stdout]   --> src/lib.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::mem::take;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `prev_task` and `next_task` are never read
[INFO] [stdout]    --> src/lib.rs:236:2
[INFO] [stdout]     |
[INFO] [stdout] 235 | struct InsertionData {
[INFO] [stdout]     |        ------------- fields in this struct
[INFO] [stdout] 236 |     prev_task: Task,
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout] 237 |     next_task: Task,
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `InsertionData` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `solutions`
[INFO] [stdout]   --> src/main.rs:38:6
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let solutions = muto.solve();
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_solutions`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem::take`
[INFO] [stdout]   --> src/lib.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::mem::take;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `prev_task` and `next_task` are never read
[INFO] [stdout]    --> src/lib.rs:236:2
[INFO] [stdout]     |
[INFO] [stdout] 235 | struct InsertionData {
[INFO] [stdout]     |        ------------- fields in this struct
[INFO] [stdout] 236 |     prev_task: Task,
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout] 237 |     next_task: Task,
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `InsertionData` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.21s
[INFO] running `Command { std: "docker" "inspect" "2203d39bfd731d7917383a0cbe378ac1bc14e78e96c84ceb6fa63a543ff4adfb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2203d39bfd731d7917383a0cbe378ac1bc14e78e96c84ceb6fa63a543ff4adfb", kill_on_drop: false }`
[INFO] [stdout] 2203d39bfd731d7917383a0cbe378ac1bc14e78e96c84ceb6fa63a543ff4adfb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 93d86aa581f387c99b2b6918ce7185882e64f0911f2d16f29379f6c80ae6d482
[INFO] running `Command { std: "docker" "start" "-a" "93d86aa581f387c99b2b6918ce7185882e64f0911f2d16f29379f6c80ae6d482", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::mem::take`
[INFO] [stderr]   --> src/lib.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::mem::take;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: fields `prev_task` and `next_task` are never read
[INFO] [stderr]    --> src/lib.rs:236:2
[INFO] [stderr]     |
[INFO] [stderr] 235 | struct InsertionData {
[INFO] [stderr]     |        ------------- fields in this struct
[INFO] [stderr] 236 |     prev_task: Task,
[INFO] [stderr]     |     ^^^^^^^^^
[INFO] [stderr] 237 |     next_task: Task,
[INFO] [stderr]     |     ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `InsertionData` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stderr]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `muto` (lib) generated 2 warnings (run `cargo fix --lib -p muto` to apply 1 suggestion)
[INFO] [stderr] warning: unused variable: `solutions`
[INFO] [stderr]   --> src/main.rs:38:6
[INFO] [stderr]    |
[INFO] [stderr] 38 |     let solutions = muto.solve();
[INFO] [stderr]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_solutions`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `muto` (bin "muto" test) generated 1 warning
[INFO] [stderr] warning: `muto` (lib test) generated 2 warnings (2 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/muto-1d20c7fb675828f6)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test tests::it_works ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/muto-7d6705a8f0894e95)
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests muto
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "93d86aa581f387c99b2b6918ce7185882e64f0911f2d16f29379f6c80ae6d482", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "93d86aa581f387c99b2b6918ce7185882e64f0911f2d16f29379f6c80ae6d482", kill_on_drop: false }`
[INFO] [stdout] 93d86aa581f387c99b2b6918ce7185882e64f0911f2d16f29379f6c80ae6d482