[INFO] fetching crate art-tree 0.2.0... [INFO] building art-tree-0.2.0 against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523 [INFO] extracting crate art-tree 0.2.0 into /workspace/builds/worker-7-tc1/source [INFO] validating manifest of crates.io crate art-tree 0.2.0 on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking crates.io crate art-tree 0.2.0 [INFO] finished tweaking crates.io crate art-tree 0.2.0 [INFO] tweaked toml for crates.io crate art-tree 0.2.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 79 packages to latest compatible versions [INFO] [stderr] Adding criterion v0.3.6 (available: v0.5.1) [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] cb87fb75e475dda6ad290b68c3fabab596606ed2bac4aa7f78afccc0ed55c68f [INFO] running `Command { std: "docker" "start" "-a" "cb87fb75e475dda6ad290b68c3fabab596606ed2bac4aa7f78afccc0ed55c68f", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "cb87fb75e475dda6ad290b68c3fabab596606ed2bac4aa7f78afccc0ed55c68f", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "cb87fb75e475dda6ad290b68c3fabab596606ed2bac4aa7f78afccc0ed55c68f", kill_on_drop: false }` [INFO] [stdout] cb87fb75e475dda6ad290b68c3fabab596606ed2bac4aa7f78afccc0ed55c68f [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 5cec7179a61d83371c561c58f35c0014d03eb77c118d78083e35f3f6e10d5e0c [INFO] running `Command { std: "docker" "start" "-a" "5cec7179a61d83371c561c58f35c0014d03eb77c118d78083e35f3f6e10d5e0c", kill_on_drop: false }` [INFO] [stderr] Compiling art-tree v0.2.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unreachable statement [INFO] [stdout] --> src/node.rs:244:9 [INFO] [stdout] | [INFO] [stdout] 241 | return Some(val); [INFO] [stdout] | ---------------- any code following this expression is unreachable [INFO] [stdout] ... [INFO] [stdout] 244 | / for i in 0..self.keys.len() { [INFO] [stdout] 245 | | // find key which uses last cell inside values array [INFO] [stdout] 246 | | if self.keys[i] == self.len as u8 { [INFO] [stdout] ... | [INFO] [stdout] 253 | | } [INFO] [stdout] | |_________^ unreachable statement [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unreachable_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/lib.rs:290:13 [INFO] [stdout] | [INFO] [stdout] 290 | &mut *(interim as *const BoxedNode> as *mut BoxedNode>) [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: for more information, visit [INFO] [stdout] = note: `#[deny(invalid_reference_casting)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: the type `[Option; 256]` does not permit being left uninitialized [INFO] [stdout] --> src/node.rs:378:22 [INFO] [stdout] | [INFO] [stdout] 378 | unsafe { MaybeUninit::<[Option; 256]>::uninit().assume_init() }; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | this code causes undefined behavior when executed [INFO] [stdout] | help: use `MaybeUninit` instead, and only call `assume_init` after initialization is done [INFO] [stdout] | [INFO] [stdout] note: enums with multiple inhabited variants have to be initialized to a variant [INFO] [stdout] --> /rustc/11663cd3bfefef7d34e8f0892c250bf698049392/library/core/src/option.rs:572:1 [INFO] [stdout] = note: `#[warn(invalid_value)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `art-tree` (lib) due to 1 previous error; 2 warnings emitted [INFO] running `Command { std: "docker" "inspect" "5cec7179a61d83371c561c58f35c0014d03eb77c118d78083e35f3f6e10d5e0c", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "5cec7179a61d83371c561c58f35c0014d03eb77c118d78083e35f3f6e10d5e0c", kill_on_drop: false }` [INFO] [stdout] 5cec7179a61d83371c561c58f35c0014d03eb77c118d78083e35f3f6e10d5e0c