[INFO] fetching crate mcircuit 0.1.7...
[INFO] checking mcircuit-0.1.7 against master#33fdb797f59421c7bbecaa4588ed5d7a31a9494a for pr-87190-3
[INFO] extracting crate mcircuit 0.1.7 into /workspace/builds/worker-97/source
[INFO] validating manifest of crates.io crate mcircuit 0.1.7 on toolchain 33fdb797f59421c7bbecaa4588ed5d7a31a9494a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-97/source/rust-toolchain
[INFO] started tweaking crates.io crate mcircuit 0.1.7
[INFO] finished tweaking crates.io crate mcircuit 0.1.7
[INFO] tweaked toml for crates.io crate mcircuit 0.1.7 written to /workspace/builds/worker-97/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-97/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-97/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8684ad64364245270f4935393c467f10062bd98b0cf5a7d131668f3d50511e72
[INFO] running `Command { std: "docker" "start" "-a" "8684ad64364245270f4935393c467f10062bd98b0cf5a7d131668f3d50511e72", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8684ad64364245270f4935393c467f10062bd98b0cf5a7d131668f3d50511e72", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8684ad64364245270f4935393c467f10062bd98b0cf5a7d131668f3d50511e72", kill_on_drop: false }`
[INFO] [stdout] 8684ad64364245270f4935393c467f10062bd98b0cf5a7d131668f3d50511e72
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-97/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-97/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3f9f1f01206af9c8e264da7067f1eb9a90743789554ae90d20d406700f8a41cf
[INFO] running `Command { std: "docker" "start" "-a" "3f9f1f01206af9c8e264da7067f1eb9a90743789554ae90d20d406700f8a41cf", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.75
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking itoa v0.4.8
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]    Compiling lexpr-macros v0.2.1
[INFO] [stderr]     Checking lexpr v0.2.6
[INFO] [stderr]    Compiling serde_derive v1.0.128
[INFO] [stderr]    Compiling variant_count v1.1.0
[INFO] [stderr]     Checking serde v1.0.128
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking serde_json v1.0.66
[INFO] [stderr]     Checking mcircuit v0.1.7 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Cons`
[INFO] [stdout]   --> src/parsers/smtlib.rs:30:17
[INFO] [stdout]    |
[INFO] [stdout] 30 |     use lexpr::{Cons, Value};
[INFO] [stdout]    |                 ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sample`
[INFO] [stdout]   --> src/parsers/smtlib.rs:75:8
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn sample() -> String {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 20.66s
[INFO] running `Command { std: "docker" "inspect" "3f9f1f01206af9c8e264da7067f1eb9a90743789554ae90d20d406700f8a41cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f9f1f01206af9c8e264da7067f1eb9a90743789554ae90d20d406700f8a41cf", kill_on_drop: false }`
[INFO] [stdout] 3f9f1f01206af9c8e264da7067f1eb9a90743789554ae90d20d406700f8a41cf