[INFO] fetching crate slaballoc 0.1.0... [INFO] checking slaballoc-0.1.0 against master#f609b7e0586f81fefb3523e3e17adf779ac416be for pr-129466-2 [INFO] extracting crate slaballoc 0.1.0 into /workspace/builds/worker-3-tc1/source [INFO] validating manifest of crates.io crate slaballoc 0.1.0 on toolchain f609b7e0586f81fefb3523e3e17adf779ac416be [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking crates.io crate slaballoc 0.1.0 [INFO] finished tweaking crates.io crate slaballoc 0.1.0 [INFO] tweaked toml for crates.io crate slaballoc 0.1.0 written to /workspace/builds/worker-3-tc1/source/Cargo.toml [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "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" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 1cf3639dcf95699e52ce4c36f9d19e4c54a04634f029a58b0329be641ccee6c1 [INFO] running `Command { std: "docker" "start" "-a" "1cf3639dcf95699e52ce4c36f9d19e4c54a04634f029a58b0329be641ccee6c1", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "1cf3639dcf95699e52ce4c36f9d19e4c54a04634f029a58b0329be641ccee6c1", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "1cf3639dcf95699e52ce4c36f9d19e4c54a04634f029a58b0329be641ccee6c1", kill_on_drop: false }` [INFO] [stdout] 1cf3639dcf95699e52ce4c36f9d19e4c54a04634f029a58b0329be641ccee6c1 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] e0ee6110b811bd6b70058c9b548eb9629bf5d84d32d226f45a964284bba1db49 [INFO] running `Command { std: "docker" "start" "-a" "e0ee6110b811bd6b70058c9b548eb9629bf5d84d32d226f45a964284bba1db49", kill_on_drop: false }` [INFO] [stderr] Checking slaballoc v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell` [INFO] [stdout] --> src/slab.rs:130:21 [INFO] [stdout] | [INFO] [stdout] 127 | let el_ptr = &data[slot] as *const _ as *mut MaybeUninit; [INFO] [stdout] | ---------------------------------------------- casting happend here [INFO] [stdout] ... [INFO] [stdout] 130 | Ok(unsafe { &mut *el_ptr }) [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: for more information, visit [INFO] [stdout] = note: even for types with interior mutability, the only legal way to obtain a mutable pointer from a shared reference is through `UnsafeCell::get` [INFO] [stdout] = note: `#[deny(invalid_reference_casting)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to 1 previous error [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `slaballoc` (lib) due to 2 previous errors [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stdout] warning: field `data` is never read [INFO] [stdout] --> src/slab.rs:230:13 [INFO] [stdout] | [INFO] [stdout] 229 | struct Element { [INFO] [stdout] | ------- field in this struct [INFO] [stdout] 230 | data: usize, [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `Element` 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] error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell` [INFO] [stdout] --> src/slab.rs:130:21 [INFO] [stdout] | [INFO] [stdout] 127 | let el_ptr = &data[slot] as *const _ as *mut MaybeUninit; [INFO] [stdout] | ---------------------------------------------- casting happend here [INFO] [stdout] ... [INFO] [stdout] 130 | Ok(unsafe { &mut *el_ptr }) [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: for more information, visit [INFO] [stdout] = note: even for types with interior mutability, the only legal way to obtain a mutable pointer from a shared reference is through `UnsafeCell::get` [INFO] [stdout] = note: `#[deny(invalid_reference_casting)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to 1 previous error; 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `slaballoc` (lib test) due to 2 previous errors; 1 warning emitted [INFO] running `Command { std: "docker" "inspect" "e0ee6110b811bd6b70058c9b548eb9629bf5d84d32d226f45a964284bba1db49", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "e0ee6110b811bd6b70058c9b548eb9629bf5d84d32d226f45a964284bba1db49", kill_on_drop: false }` [INFO] [stdout] e0ee6110b811bd6b70058c9b548eb9629bf5d84d32d226f45a964284bba1db49