[INFO] fetching crate zksnark 0.0.2...
[INFO] extracting crate zksnark 0.0.2 into work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/reg/zksnark/0.0.2
[INFO] extracting crate zksnark 0.0.2 into work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/reg/zksnark/0.0.2
[INFO] validating manifest of zksnark-0.0.2 on toolchain master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of zksnark-0.0.2 on toolchain try#8f81d0bf6baf07b92f1246696722485c4ca0b049
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing zksnark-0.0.2
[INFO] finished frobbing zksnark-0.0.2
[INFO] frobbed toml for zksnark-0.0.2 written to work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/reg/zksnark/0.0.2/Cargo.toml
[INFO] started frobbing zksnark-0.0.2
[INFO] finished frobbing zksnark-0.0.2
[INFO] frobbed toml for zksnark-0.0.2 written to work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/reg/zksnark/0.0.2/Cargo.toml
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] checking zksnark-0.0.2 against try#8f81d0bf6baf07b92f1246696722485c4ca0b049 for pr-62008
[INFO] running `"docker" "create" "-v" "/mnt/big/ec2-user/crater/work/local/target-dirs/pr-62008/worker-4/try#8f81d0bf6baf07b92f1246696722485c4ca0b049:/opt/crater/target:rw,Z" "-v" "/mnt/big/ec2-user/crater/work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/reg/zksnark/0.0.2:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/ec2-user/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/ec2-user/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] fa69b54e6872a4ed35a63f7142422b9d38ba609e1e23e862359457d8ab3bf6e0
[INFO] running `"docker" "start" "-a" "fa69b54e6872a4ed35a63f7142422b9d38ba609e1e23e862359457d8ab3bf6e0"`
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling log v0.4.7
[INFO] [stderr]    Compiling regex v1.1.9
[INFO] [stderr]     Checking ucd-util v0.1.3
[INFO] [stderr]    Compiling crunchy v0.1.6
[INFO] [stderr]     Checking quick-error v1.2.2
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]     Checking utf8-ranges v1.0.3
[INFO] [stderr]     Checking termcolor v1.0.5
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]     Checking byteorder v0.5.3
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking humantime v1.2.0
[INFO] [stderr]     Checking regex-syntax v0.6.8
[INFO] [stderr]     Checking itertools v0.6.5
[INFO] [stderr]     Checking rand_core v0.2.2
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking atty v0.2.13
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking bigint v4.4.1
[INFO] [stderr]     Checking aho-corasick v0.7.4
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking bn v0.4.3
[INFO] [stderr]     Checking zksnark v0.0.2 (/opt/crater/workdir)
[INFO] [stderr] warning: function is never used: `chinese_remainder`
[INFO] [stderr]    --> src/field/mod.rs:274:1
[INFO] [stderr]     |
[INFO] [stderr] 274 | / fn chinese_remainder<T>(rems: &[T], moduli: &[T]) -> T
[INFO] [stderr] 275 | | where
[INFO] [stderr] 276 | |     T: Div<Output = T>
[INFO] [stderr] 277 | |         + Mul<Output = T>
[INFO] [stderr] ...   |
[INFO] [stderr] 295 | |         .fold(T::zero(), |acc, x| acc + x)
[INFO] [stderr] 296 | | }
[INFO] [stderr]     | |_^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Checking env_logger v0.5.13
[INFO] [stderr]     Checking quickcheck v0.7.2
[INFO] [stderr] warning: unnecessary parentheses around `return` value
[INFO] [stderr]    --> src/field/mod.rs:457:28
[INFO] [stderr]     |
[INFO] [stderr] 457 |                     return (degree == poly.degree());
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `BitAnd`, `BitOr`, `BitXor`
[INFO] [stderr]  --> src/groth16/circuit/builder/tests.rs:3:16
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::ops::{BitAnd, BitOr, BitXor};
[INFO] [stderr]   |                ^^^^^^  ^^^^^  ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [optimized + debuginfo] target(s) in 24.40s
[INFO] running `"docker" "inspect" "fa69b54e6872a4ed35a63f7142422b9d38ba609e1e23e862359457d8ab3bf6e0"`
[INFO] running `"docker" "rm" "-f" "fa69b54e6872a4ed35a63f7142422b9d38ba609e1e23e862359457d8ab3bf6e0"`
[INFO] [stdout] fa69b54e6872a4ed35a63f7142422b9d38ba609e1e23e862359457d8ab3bf6e0