[INFO] fetching crate lfan 0.2.6...
[INFO] checking lfan-0.2.6 against try#7014e13d5becc920d4bea3cd87942c8a13d359bf+rustflags=-Dtail_expr_drop_order for pr-129864
[INFO] extracting crate lfan 0.2.6 into /workspace/builds/worker-3-tc2/source
[INFO] validating manifest of crates.io crate lfan 0.2.6 on toolchain 7014e13d5becc920d4bea3cd87942c8a13d359bf
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lfan 0.2.6
[INFO] finished tweaking crates.io crate lfan 0.2.6
[INFO] tweaked toml for crates.io crate lfan 0.2.6 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 30 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 50bba60147bbdac717b9289143e3c84b2bca21b4b480fc3fae509122d06340c1
[INFO] running `Command { std: "docker" "start" "-a" "50bba60147bbdac717b9289143e3c84b2bca21b4b480fc3fae509122d06340c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "50bba60147bbdac717b9289143e3c84b2bca21b4b480fc3fae509122d06340c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50bba60147bbdac717b9289143e3c84b2bca21b4b480fc3fae509122d06340c1", kill_on_drop: false }`
[INFO] [stdout] 50bba60147bbdac717b9289143e3c84b2bca21b4b480fc3fae509122d06340c1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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 -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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 79fe7a30394cec15a59778a22f51441ef421abbe754cd18660c9b1e491c88d2a
[INFO] running `Command { std: "docker" "start" "-a" "79fe7a30394cec15a59778a22f51441ef421abbe754cd18660c9b1e491c88d2a", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.77
[INFO] [stderr]    Compiling tracing-attributes v0.1.27
[INFO] [stderr]     Checking tracing v0.1.40
[INFO] [stderr]     Checking lfan v0.2.6 (/opt/rustwide/workdir)
[INFO] [stdout] warning: methods `insert`, `get`, and `clear` are never used
[INFO] [stdout]   --> src/cache/cache_trait.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 4  | pub trait Cache {
[INFO] [stdout]    |           ----- methods in this trait
[INFO] [stdout] ...
[INFO] [stdout] 12 |     fn insert(&mut self, key: Self::Key, value: Self::Value) -> (bool, Option<Self::Value>);
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 13 |
[INFO] [stdout] 14 |     fn get<Q: ?Sized>(&mut self, key: &Q) -> Option<&Self::Value>
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     fn clear(&mut self);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `insert`, `get`, and `clear` are never used
[INFO] [stdout]   --> src/cache/cache_trait.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 4  | pub trait Cache {
[INFO] [stdout]    |           ----- methods in this trait
[INFO] [stdout] ...
[INFO] [stdout] 12 |     fn insert(&mut self, key: Self::Key, value: Self::Value) -> (bool, Option<Self::Value>);
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 13 |
[INFO] [stdout] 14 |     fn get<Q: ?Sized>(&mut self, key: &Q) -> Option<&Self::Value>
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     fn clear(&mut self);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.56s
[INFO] running `Command { std: "docker" "inspect" "79fe7a30394cec15a59778a22f51441ef421abbe754cd18660c9b1e491c88d2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "79fe7a30394cec15a59778a22f51441ef421abbe754cd18660c9b1e491c88d2a", kill_on_drop: false }`
[INFO] [stdout] 79fe7a30394cec15a59778a22f51441ef421abbe754cd18660c9b1e491c88d2a