[INFO] fetching crate lemon-mint 0.1.4...
[INFO] checking lemon-mint-0.1.4 against master#0f6e1ae67854c3c44726e8376144c16b465fe7c6 for pr-129392
[INFO] extracting crate lemon-mint 0.1.4 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate lemon-mint 0.1.4 on toolchain 0f6e1ae67854c3c44726e8376144c16b465fe7c6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0f6e1ae67854c3c44726e8376144c16b465fe7c6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lemon-mint 0.1.4
[INFO] finished tweaking crates.io crate lemon-mint 0.1.4
[INFO] tweaked toml for crates.io crate lemon-mint 0.1.4 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0f6e1ae67854c3c44726e8376144c16b465fe7c6" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0f6e1ae67854c3c44726e8376144c16b465fe7c6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+0f6e1ae67854c3c44726e8376144c16b465fe7c6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6ebd7273421b8dd570d340baf0bc7006b898e7f117d65d1b9be3ca6f7106f6cc
[INFO] running `Command { std: "docker" "start" "-a" "6ebd7273421b8dd570d340baf0bc7006b898e7f117d65d1b9be3ca6f7106f6cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6ebd7273421b8dd570d340baf0bc7006b898e7f117d65d1b9be3ca6f7106f6cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ebd7273421b8dd570d340baf0bc7006b898e7f117d65d1b9be3ca6f7106f6cc", kill_on_drop: false }`
[INFO] [stdout] 6ebd7273421b8dd570d340baf0bc7006b898e7f117d65d1b9be3ca6f7106f6cc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+0f6e1ae67854c3c44726e8376144c16b465fe7c6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5145552782db67804af8a04611a53e9cfb88ff5bc44e7e683cd9ab37b3afbe00
[INFO] running `Command { std: "docker" "start" "-a" "5145552782db67804af8a04611a53e9cfb88ff5bc44e7e683cd9ab37b3afbe00", kill_on_drop: false }`
[INFO] [stderr]     Checking lemon-mint v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `with_fallback`, `n_nonterminals`, and `tables_size` are never read
[INFO] [stdout]     --> src/lib.rs:2831:2
[INFO] [stdout]      |
[INFO] [stdout] 2808 | pub struct LemonMint
[INFO] [stdout]      |            --------- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 2831 |     with_fallback: bool,
[INFO] [stdout]      |     ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 2842 |     n_nonterminals: usize,
[INFO] [stdout]      |     ^^^^^^^^^^^^^^
[INFO] [stdout] 2843 |     tables_size: usize,                // Total table size of all tables in bytes
[INFO] [stdout]      |     ^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `LemonMint` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]      = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `with_fallback`, `n_nonterminals`, and `tables_size` are never read
[INFO] [stdout]     --> src/lib.rs:2831:2
[INFO] [stdout]      |
[INFO] [stdout] 2808 | pub struct LemonMint
[INFO] [stdout]      |            --------- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 2831 |     with_fallback: bool,
[INFO] [stdout]      |     ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 2842 |     n_nonterminals: usize,
[INFO] [stdout]      |     ^^^^^^^^^^^^^^
[INFO] [stdout] 2843 |     tables_size: usize,                // Total table size of all tables in bytes
[INFO] [stdout]      |     ^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `LemonMint` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]      = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]     --> src/lib.rs:1359:7
[INFO] [stdout]      |
[INFO] [stdout] 1359 |                         mem::replace(&mut symbols.array[rhs.index].firstset, set);
[INFO] [stdout]      |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1359 |                         let _ = mem::replace(&mut symbols.array[rhs.index].firstset, set);
[INFO] [stdout]      |                         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]     --> src/lib.rs:1359:7
[INFO] [stdout]      |
[INFO] [stdout] 1359 |                         mem::replace(&mut symbols.array[rhs.index].firstset, set);
[INFO] [stdout]      |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1359 |                         let _ = mem::replace(&mut symbols.array[rhs.index].firstset, set);
[INFO] [stdout]      |                         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.42s
[INFO] running `Command { std: "docker" "inspect" "5145552782db67804af8a04611a53e9cfb88ff5bc44e7e683cd9ab37b3afbe00", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5145552782db67804af8a04611a53e9cfb88ff5bc44e7e683cd9ab37b3afbe00", kill_on_drop: false }`
[INFO] [stdout] 5145552782db67804af8a04611a53e9cfb88ff5bc44e7e683cd9ab37b3afbe00