[INFO] fetching crate zksnark 0.0.2...
[INFO] checking zksnark-0.0.2 against master#a836d9b6413d9d593be6c09463ff8c4c70e56599 for pr-84037
[INFO] extracting crate zksnark 0.0.2 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate zksnark 0.0.2 on toolchain a836d9b6413d9d593be6c09463ff8c4c70e56599
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a836d9b6413d9d593be6c09463ff8c4c70e56599" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate zksnark 0.0.2
[INFO] finished tweaking crates.io crate zksnark 0.0.2
[INFO] tweaked toml for crates.io crate zksnark 0.0.2 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a836d9b6413d9d593be6c09463ff8c4c70e56599" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a836d9b6413d9d593be6c09463ff8c4c70e56599" "fetch" "--locked" "--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-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a836d9b6413d9d593be6c09463ff8c4c70e56599" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 34712fe028e384ed286d9d28ceb4db9aea31fbc2a9a4a3040f3bf0cfb433a940
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "34712fe028e384ed286d9d28ceb4db9aea31fbc2a9a4a3040f3bf0cfb433a940", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "34712fe028e384ed286d9d28ceb4db9aea31fbc2a9a4a3040f3bf0cfb433a940", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "34712fe028e384ed286d9d28ceb4db9aea31fbc2a9a4a3040f3bf0cfb433a940", kill_on_drop: false }`
[INFO] [stdout] 34712fe028e384ed286d9d28ceb4db9aea31fbc2a9a4a3040f3bf0cfb433a940
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a836d9b6413d9d593be6c09463ff8c4c70e56599" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c3d0bb05483960aa829b931e0eff76560c7780d18f5a192a63a79bc69e0f3115
[INFO] running `Command { std: "docker" "start" "-a" "c3d0bb05483960aa829b931e0eff76560c7780d18f5a192a63a79bc69e0f3115", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling crunchy v0.1.6
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking regex-syntax v0.6.23
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking byteorder v0.5.3
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking termcolor v1.1.2
[INFO] [stderr]    Compiling libc v0.2.94
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]     Checking itertools v0.6.5
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking rand_core v0.2.2
[INFO] [stderr]     Checking bigint v4.4.3
[INFO] [stderr]     Checking aho-corasick v0.7.15
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking bn v0.4.3
[INFO] [stderr]     Checking zksnark v0.0.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking regex v1.4.6
[INFO] [stdout] warning: function is never used: `chinese_remainder`
[INFO] [stdout]    --> src/field/mod.rs:274:4
[INFO] [stdout]     |
[INFO] [stdout] 274 | fn chinese_remainder<T>(rems: &[T], moduli: &[T]) -> T
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/groth16/circuit/mod.rs:497:20
[INFO] [stdout]     |
[INFO] [stdout] 497 |             panic!("Under constained or malformed inputs".to_string());
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 497 |             panic!("{}", "Under constained or malformed inputs".to_string());
[INFO] [stdout]     |                    ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]     |
[INFO] [stdout] 497 |             std::panic::panic_any("Under constained or malformed inputs".to_string());
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking env_logger v0.5.13
[INFO] [stderr]     Checking quickcheck v0.7.2
[INFO] [stdout] warning: unnecessary parentheses around `return` value
[INFO] [stdout]    --> src/field/mod.rs:457:28
[INFO] [stdout]     |
[INFO] [stdout] 457 |                     return (degree == poly.degree());
[INFO] [stdout]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BitAnd`, `BitOr`, `BitXor`
[INFO] [stdout]  --> src/groth16/circuit/builder/tests.rs:3:16
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::ops::{BitAnd, BitOr, BitXor};
[INFO] [stdout]   |                ^^^^^^  ^^^^^  ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/groth16/circuit/mod.rs:497:20
[INFO] [stdout]     |
[INFO] [stdout] 497 |             panic!("Under constained or malformed inputs".to_string());
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 497 |             panic!("{}", "Under constained or malformed inputs".to_string());
[INFO] [stdout]     |                    ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]     |
[INFO] [stdout] 497 |             std::panic::panic_any("Under constained or malformed inputs".to_string());
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [optimized + debuginfo] target(s) in 17.42s
[INFO] running `Command { std: "docker" "inspect" "c3d0bb05483960aa829b931e0eff76560c7780d18f5a192a63a79bc69e0f3115", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3d0bb05483960aa829b931e0eff76560c7780d18f5a192a63a79bc69e0f3115", kill_on_drop: false }`
[INFO] [stdout] c3d0bb05483960aa829b931e0eff76560c7780d18f5a192a63a79bc69e0f3115