[INFO] fetching crate histo_fp 0.2.1...
[INFO] building histo_fp-0.2.1 against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] extracting crate histo_fp 0.2.1 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate histo_fp 0.2.1 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 histo_fp 0.2.1
[INFO] finished tweaking crates.io crate histo_fp 0.2.1
[INFO] tweaked toml for crates.io crate histo_fp 0.2.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate histo_fp 0.2.1 already has a lockfile, it will not be regenerated
[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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded streaming-stats v0.1.29
[INFO] [stderr]   Downloaded noisy_float v0.1.12
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] edd1130397f6ce901b848ed28bcfbc549304a1056d920f1888ab287074480363
[INFO] running `Command { std: "docker" "start" "-a" "edd1130397f6ce901b848ed28bcfbc549304a1056d920f1888ab287074480363", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "edd1130397f6ce901b848ed28bcfbc549304a1056d920f1888ab287074480363", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "edd1130397f6ce901b848ed28bcfbc549304a1056d920f1888ab287074480363", kill_on_drop: false }`
[INFO] [stdout] edd1130397f6ce901b848ed28bcfbc549304a1056d920f1888ab287074480363
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] e086616e19a927421626b087a7a9507ee167eabef02cab69255677b783fc3000
[INFO] running `Command { std: "docker" "start" "-a" "e086616e19a927421626b087a7a9507ee167eabef02cab69255677b783fc3000", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling ppv-lite86 v0.2.8
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling streaming-stats v0.1.29
[INFO] [stderr]    Compiling noisy_float v0.1.12
[INFO] [stderr]    Compiling histo_fp v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `precision` is never read
[INFO] [stdout]   --> src/lib.rs:84:5
[INFO] [stdout]    |
[INFO] [stdout] 82 | pub struct Histogram {
[INFO] [stdout]    |            --------- field in this struct
[INFO] [stdout] 83 |     num_buckets: u64,
[INFO] [stdout] 84 |     precision: u32,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Histogram` has derived impls for the traits `Clone` and `Debug`, 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 1.67s
[INFO] running `Command { std: "docker" "inspect" "e086616e19a927421626b087a7a9507ee167eabef02cab69255677b783fc3000", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e086616e19a927421626b087a7a9507ee167eabef02cab69255677b783fc3000", kill_on_drop: false }`
[INFO] [stdout] e086616e19a927421626b087a7a9507ee167eabef02cab69255677b783fc3000
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f3da1f333c80db3806a3b3aa5c8fdee149415045a0aced5fd56735feb8ff0e5f
[INFO] running `Command { std: "docker" "start" "-a" "f3da1f333c80db3806a3b3aa5c8fdee149415045a0aced5fd56735feb8ff0e5f", kill_on_drop: false }`
[INFO] [stderr]    Compiling histo_fp v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `precision` is never read
[INFO] [stdout]   --> src/lib.rs:84:5
[INFO] [stdout]    |
[INFO] [stdout] 82 | pub struct Histogram {
[INFO] [stdout]    |            --------- field in this struct
[INFO] [stdout] 83 |     num_buckets: u64,
[INFO] [stdout] 84 |     precision: u32,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Histogram` has derived impls for the traits `Clone` and `Debug`, 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: field `precision` is never read
[INFO] [stdout]   --> src/lib.rs:84:5
[INFO] [stdout]    |
[INFO] [stdout] 82 | pub struct Histogram {
[INFO] [stdout]    |            --------- field in this struct
[INFO] [stdout] 83 |     num_buckets: u64,
[INFO] [stdout] 84 |     precision: u32,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Histogram` has derived impls for the traits `Clone` and `Debug`, 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 `test` profile [unoptimized + debuginfo] target(s) in 0.41s
[INFO] running `Command { std: "docker" "inspect" "f3da1f333c80db3806a3b3aa5c8fdee149415045a0aced5fd56735feb8ff0e5f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3da1f333c80db3806a3b3aa5c8fdee149415045a0aced5fd56735feb8ff0e5f", kill_on_drop: false }`
[INFO] [stdout] f3da1f333c80db3806a3b3aa5c8fdee149415045a0aced5fd56735feb8ff0e5f