[INFO] fetching crate mcircuit 0.1.8...
[INFO] checking mcircuit-0.1.8 against master#936f2600b6c903b04387f74ed5cbce88bb06d243 for pr-91141
[INFO] extracting crate mcircuit 0.1.8 into /workspace/builds/worker-72/source
[INFO] validating manifest of crates.io crate mcircuit 0.1.8 on toolchain 936f2600b6c903b04387f74ed5cbce88bb06d243
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-72/source/rust-toolchain
[INFO] started tweaking crates.io crate mcircuit 0.1.8
[INFO] finished tweaking crates.io crate mcircuit 0.1.8
[INFO] tweaked toml for crates.io crate mcircuit 0.1.8 written to /workspace/builds/worker-72/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "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-72/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-72/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 461c750a6961e77e0bd0844edd336da1832b13abe48ca9339c7400fef25b1bef
[INFO] running `Command { std: "docker" "start" "-a" "461c750a6961e77e0bd0844edd336da1832b13abe48ca9339c7400fef25b1bef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "461c750a6961e77e0bd0844edd336da1832b13abe48ca9339c7400fef25b1bef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "461c750a6961e77e0bd0844edd336da1832b13abe48ca9339c7400fef25b1bef", kill_on_drop: false }`
[INFO] [stdout] 461c750a6961e77e0bd0844edd336da1832b13abe48ca9339c7400fef25b1bef
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-72/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-72/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5b644fb4d714c58dde64d039748956283a7dc192c61bf7c9215a1923814e1b11
[INFO] running `Command { std: "docker" "start" "-a" "5b644fb4d714c58dde64d039748956283a7dc192c61bf7c9215a1923814e1b11", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[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]    Compiling quote v1.0.10
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling lexpr-macros v0.2.1
[INFO] [stderr]     Checking lexpr v0.2.6
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling variant_count v1.1.0
[INFO] [stderr]     Checking serde v1.0.130
[INFO] [stderr]     Checking serde_json v1.0.72
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking mcircuit v0.1.8 (/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: unused variable: `gate`
[INFO] [stdout]  --> src/exporters/json.rs:5:31
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn gate_to_json<T: WireValue>(gate: &Operation<T>) -> Value {
[INFO] [stdout]   |                               ^^^^ help: if this is intentional, prefix it with an underscore: `_gate`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `gates`
[INFO] [stdout]  --> src/exporters/json.rs:9:29
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn bool_circuit_to_json(gates: &[Operation<bool>], bool_witness: &[bool]) -> Result<String> {
[INFO] [stdout]   |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_gates`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `bool_witness`
[INFO] [stdout]  --> src/exporters/json.rs:9:56
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn bool_circuit_to_json(gates: &[Operation<bool>], bool_witness: &[bool]) -> Result<String> {
[INFO] [stdout]   |                                                        ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_bool_witness`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `gate`
[INFO] [stdout]  --> src/exporters/json.rs:5:31
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn gate_to_json<T: WireValue>(gate: &Operation<T>) -> Value {
[INFO] [stdout]   |                               ^^^^ help: if this is intentional, prefix it with an underscore: `_gate`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `gates`
[INFO] [stdout]  --> src/exporters/json.rs:9:29
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn bool_circuit_to_json(gates: &[Operation<bool>], bool_witness: &[bool]) -> Result<String> {
[INFO] [stdout]   |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_gates`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `bool_witness`
[INFO] [stdout]  --> src/exporters/json.rs:9:56
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn bool_circuit_to_json(gates: &[Operation<bool>], bool_witness: &[bool]) -> Result<String> {
[INFO] [stdout]   |                                                        ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_bool_witness`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `gate_to_json`
[INFO] [stdout]  --> src/exporters/json.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn gate_to_json<T: WireValue>(gate: &Operation<T>) -> Value {
[INFO] [stdout]   |    ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `gate_to_json`
[INFO] [stdout]  --> src/exporters/json.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn gate_to_json<T: WireValue>(gate: &Operation<T>) -> Value {
[INFO] [stdout]   |    ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` 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] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 26.72s
[INFO] running `Command { std: "docker" "inspect" "5b644fb4d714c58dde64d039748956283a7dc192c61bf7c9215a1923814e1b11", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b644fb4d714c58dde64d039748956283a7dc192c61bf7c9215a1923814e1b11", kill_on_drop: false }`
[INFO] [stdout] 5b644fb4d714c58dde64d039748956283a7dc192c61bf7c9215a1923814e1b11