[INFO] fetching crate alco 0.1.0...
[INFO] checking alco-0.1.0 against try#a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d for pr-145342-1
[INFO] extracting crate alco 0.1.0 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate alco 0.1.0
[INFO] finished tweaking crates.io crate alco 0.1.0
[INFO] tweaked toml for crates.io crate alco 0.1.0 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate alco 0.1.0 on toolchain a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "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" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b6611033a9626ad407241c16841713a586f691a0f4da90b89076df215e0f28d7
[INFO] running `Command { std: "docker" "start" "-a" "b6611033a9626ad407241c16841713a586f691a0f4da90b89076df215e0f28d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b6611033a9626ad407241c16841713a586f691a0f4da90b89076df215e0f28d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b6611033a9626ad407241c16841713a586f691a0f4da90b89076df215e0f28d7", kill_on_drop: false }`
[INFO] [stdout] b6611033a9626ad407241c16841713a586f691a0f4da90b89076df215e0f28d7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "-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" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1e81361c2babcbf1c4c9aee69253d7e81c103cd1844474bb7a6fd21b82b1f81d
[INFO] running `Command { std: "docker" "start" "-a" "1e81361c2babcbf1c4c9aee69253d7e81c103cd1844474bb7a6fd21b82b1f81d", kill_on_drop: false }`
[INFO] [stderr]     Checking alco v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `arch`
[INFO] [stdout]   --> src/lib.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 60 |     arch: &str,
[INFO] [stdout]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_arch`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `old_calibration`
[INFO] [stdout]    --> src/lib.rs:241:27
[INFO] [stdout]     |
[INFO] [stdout] 241 |         let (calibration, old_calibration) =
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_old_calibration`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `old_stats`
[INFO] [stdout]    --> src/lib.rs:248:25
[INFO] [stdout]     |
[INFO] [stdout] 248 |             let (stats, old_stats) = run_bench(&arch, &executable, i, &[a], name, allow_aslr  );
[INFO] [stdout]     |                         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_old_stats`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `l1_hits`, `l3_hits`, and `ram_hits` are never read
[INFO] [stdout]    --> src/lib.rs:200:5
[INFO] [stdout]     |
[INFO] [stdout] 199 | struct CachegrindSummary {
[INFO] [stdout]     |        ----------------- fields in this struct
[INFO] [stdout] 200 |     l1_hits: u64,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 201 |     l3_hits: u64,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 202 |     ram_hits: u64,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `CachegrindSummary` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arch`
[INFO] [stdout]   --> src/lib.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 60 |     arch: &str,
[INFO] [stdout]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_arch`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `old_calibration`
[INFO] [stdout]    --> src/lib.rs:241:27
[INFO] [stdout]     |
[INFO] [stdout] 241 |         let (calibration, old_calibration) =
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_old_calibration`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `old_stats`
[INFO] [stdout]    --> src/lib.rs:248:25
[INFO] [stdout]     |
[INFO] [stdout] 248 |             let (stats, old_stats) = run_bench(&arch, &executable, i, &[a], name, allow_aslr  );
[INFO] [stdout]     |                         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_old_stats`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `l1_hits`, `l3_hits`, and `ram_hits` are never read
[INFO] [stdout]    --> src/lib.rs:200:5
[INFO] [stdout]     |
[INFO] [stdout] 199 | struct CachegrindSummary {
[INFO] [stdout]     |        ----------------- fields in this struct
[INFO] [stdout] 200 |     l1_hits: u64,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 201 |     l3_hits: u64,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 202 |     ram_hits: u64,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `CachegrindSummary` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.35s
[INFO] running `Command { std: "docker" "inspect" "1e81361c2babcbf1c4c9aee69253d7e81c103cd1844474bb7a6fd21b82b1f81d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e81361c2babcbf1c4c9aee69253d7e81c103cd1844474bb7a6fd21b82b1f81d", kill_on_drop: false }`
[INFO] [stdout] 1e81361c2babcbf1c4c9aee69253d7e81c103cd1844474bb7a6fd21b82b1f81d