[INFO] fetching crate nova-snark 0.32.0...
[INFO] checking nova-snark-0.32.0 against master#30f74ff0dc4d66debc8b50724c446f817e5f75f4 for pr-121848-1
[INFO] extracting crate nova-snark 0.32.0 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate nova-snark 0.32.0 on toolchain 30f74ff0dc4d66debc8b50724c446f817e5f75f4
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+30f74ff0dc4d66debc8b50724c446f817e5f75f4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate nova-snark 0.32.0
[INFO] finished tweaking crates.io crate nova-snark 0.32.0
[INFO] tweaked toml for crates.io crate nova-snark 0.32.0 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate crates.io crate nova-snark 0.32.0 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" "+30f74ff0dc4d66debc8b50724c446f817e5f75f4" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+30f74ff0dc4d66debc8b50724c446f817e5f75f4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f7d486eea6aa4ae0e63dc6ca4524049822023a3130507f278988532ffd2d53ae
[INFO] running `Command { std: "docker" "start" "-a" "f7d486eea6aa4ae0e63dc6ca4524049822023a3130507f278988532ffd2d53ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f7d486eea6aa4ae0e63dc6ca4524049822023a3130507f278988532ffd2d53ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f7d486eea6aa4ae0e63dc6ca4524049822023a3130507f278988532ffd2d53ae", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+30f74ff0dc4d66debc8b50724c446f817e5f75f4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b1c4f38f31b46b07fd1843491629a8171c474ff35eb265eb4ce19077769008b7
[INFO] running `Command { std: "docker" "start" "-a" "b1c4f38f31b46b07fd1843491629a8171c474ff35eb265eb4ce19077769008b7", kill_on_drop: false }`
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[INFO] [stderr]    Compiling neptune v13.0.0
[INFO] [stderr]     Checking nova-snark v0.32.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: the item `From` is imported redundantly
[INFO] [stdout]   --> src/gadgets/nonnative/bignat.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::convert::From;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/30f74ff0dc4d66debc8b50724c446f817e5f75f4/library/std/src/prelude/mod.rs:129:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `From` is already defined here
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/lib.rs:4:3
[INFO] [stdout]    |
[INFO] [stdout] 4  |   unused,
[INFO] [stdout]    |   ^^^^^^
[INFO] [stdout]    = note: `#[deny(unused_imports)]` implied by `#[deny(unused)]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `From` is imported redundantly
[INFO] [stdout]  --> src/gadgets/nonnative/util.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::convert::From;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/30f74ff0dc4d66debc8b50724c446f817e5f75f4/library/std/src/prelude/mod.rs:129:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `From` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `pasta_curves` is imported redundantly
[INFO] [stdout]   --> src/provider/pasta.rs:14:3
[INFO] [stdout]    |
[INFO] [stdout] 14 |   self,
[INFO] [stdout]    |   ^^^^ the item `pasta_curves` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `pasta_curves` is imported redundantly
[INFO] [stdout]  --> src/provider/msm.rs:4:20
[INFO] [stdout]   |
[INFO] [stdout] 4 | use pasta_curves::{self, arithmetic::CurveAffine, group::Group as AnotherGroup};
[INFO] [stdout]   |                    ^^^^ the item `pasta_curves` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `IntoParallelRefIterator` is imported redundantly
[INFO] [stdout]   --> src/spartan/mod.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 | use rayon::{iter::IntoParallelRefIterator, prelude::*};
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  ---------- the item `IntoParallelRefIterator` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `Engine` is imported redundantly
[INFO] [stdout]    --> src/nifs.rs:124:38
[INFO] [stdout]     |
[INFO] [stdout] 115 |   use super::*;
[INFO] [stdout]     |       -------- the item `Engine` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 124 |     traits::{snark::default_ck_hint, Engine},
[INFO] [stdout]     |                                      ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:4:3
[INFO] [stdout]     |
[INFO] [stdout] 4   |   unused,
[INFO] [stdout]     |   ^^^^^^
[INFO] [stdout]     = note: `#[deny(unused_imports)]` implied by `#[deny(unused)]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `BoxedStrategy` is imported redundantly
[INFO] [stdout]    --> src/r1cs/sparse.rs:173:16
[INFO] [stdout]     |
[INFO] [stdout] 172 |     prelude::*,
[INFO] [stdout]     |     ---------- the item `BoxedStrategy` is already imported here
[INFO] [stdout] 173 |     strategy::{BoxedStrategy, Just, Strategy},
[INFO] [stdout]     |                ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `Just` is imported redundantly
[INFO] [stdout]    --> src/r1cs/sparse.rs:173:31
[INFO] [stdout]     |
[INFO] [stdout] 172 |     prelude::*,
[INFO] [stdout]     |     ---------- the item `Just` is already imported here
[INFO] [stdout] 173 |     strategy::{BoxedStrategy, Just, Strategy},
[INFO] [stdout]     |                               ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `Strategy` is imported redundantly
[INFO] [stdout]    --> src/r1cs/sparse.rs:173:37
[INFO] [stdout]     |
[INFO] [stdout] 172 |     prelude::*,
[INFO] [stdout]     |     ---------- the item `Strategy` is already imported here
[INFO] [stdout] 173 |     strategy::{BoxedStrategy, Just, Strategy},
[INFO] [stdout]     |                                     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `Field` is imported redundantly
[INFO] [stdout]    --> src/r1cs/mod.rs:569:7
[INFO] [stdout]     |
[INFO] [stdout] 569 |   use ff::Field;
[INFO] [stdout]     |       ^^^^^^^^^
[INFO] [stdout] 570 |
[INFO] [stdout] 571 |   use super::*;
[INFO] [stdout]     |       -------- the item `Field` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `SparseMatrix` is imported redundantly
[INFO] [stdout]    --> src/r1cs/mod.rs:574:5
[INFO] [stdout]     |
[INFO] [stdout] 571 |   use super::*;
[INFO] [stdout]     |       -------- the item `SparseMatrix` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 574 |     r1cs::sparse::SparseMatrix,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `Engine` is imported redundantly
[INFO] [stdout]    --> src/r1cs/mod.rs:575:5
[INFO] [stdout]     |
[INFO] [stdout] 571 |   use super::*;
[INFO] [stdout]     |       -------- the item `Engine` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 575 |     traits::Engine,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `Field` is imported redundantly
[INFO] [stdout]    --> src/gadgets/ecc.rs:797:12
[INFO] [stdout]     |
[INFO] [stdout] 784 |   use super::*;
[INFO] [stdout]     |       -------- the item `Field` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 797 |   use ff::{Field, PrimeFieldBits};
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `From` is imported redundantly
[INFO] [stdout]   --> src/gadgets/nonnative/bignat.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::convert::From;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/30f74ff0dc4d66debc8b50724c446f817e5f75f4/library/std/src/prelude/mod.rs:129:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `From` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `From` is imported redundantly
[INFO] [stdout]  --> src/gadgets/nonnative/util.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::convert::From;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/30f74ff0dc4d66debc8b50724c446f817e5f75f4/library/std/src/prelude/mod.rs:129:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `From` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `Keccak256Transcript` is imported redundantly
[INFO] [stdout]    --> src/provider/mlkzg.rs:697:5
[INFO] [stdout]     |
[INFO] [stdout] 695 |   use super::*;
[INFO] [stdout]     |       -------- the item `Keccak256Transcript` is already imported here
[INFO] [stdout] 696 |   use crate::{
[INFO] [stdout] 697 |     provider::keccak::Keccak256Transcript, spartan::polys::multilinear::MultilinearPolynomial,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `pasta_curves` is imported redundantly
[INFO] [stdout]   --> src/provider/pasta.rs:14:3
[INFO] [stdout]    |
[INFO] [stdout] 14 |   self,
[INFO] [stdout]    |   ^^^^ the item `pasta_curves` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `pasta_curves` is imported redundantly
[INFO] [stdout]  --> src/provider/msm.rs:4:20
[INFO] [stdout]   |
[INFO] [stdout] 4 | use pasta_curves::{self, arithmetic::CurveAffine, group::Group as AnotherGroup};
[INFO] [stdout]   |                    ^^^^ the item `pasta_curves` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `AllocatedNum` is imported redundantly
[INFO] [stdout]    --> src/spartan/direct.rs:169:27
[INFO] [stdout]     |
[INFO] [stdout] 167 |   use super::*;
[INFO] [stdout]     |       -------- the item `AllocatedNum` is already imported here
[INFO] [stdout] 168 |   use crate::provider::{Bn256Engine, PallasEngine, Secp256k1Engine};
[INFO] [stdout] 169 |   use ::bellpepper_core::{num::AllocatedNum, ConstraintSystem, SynthesisError};
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `ConstraintSystem` is imported redundantly
[INFO] [stdout]    --> src/spartan/direct.rs:169:46
[INFO] [stdout]     |
[INFO] [stdout] 167 |   use super::*;
[INFO] [stdout]     |       -------- the item `ConstraintSystem` is already imported here
[INFO] [stdout] 168 |   use crate::provider::{Bn256Engine, PallasEngine, Secp256k1Engine};
[INFO] [stdout] 169 |   use ::bellpepper_core::{num::AllocatedNum, ConstraintSystem, SynthesisError};
[INFO] [stdout]     |                                              ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `SynthesisError` is imported redundantly
[INFO] [stdout]    --> src/spartan/direct.rs:169:64
[INFO] [stdout]     |
[INFO] [stdout] 167 |   use super::*;
[INFO] [stdout]     |       -------- the item `SynthesisError` is already imported here
[INFO] [stdout] 168 |   use crate::provider::{Bn256Engine, PallasEngine, Secp256k1Engine};
[INFO] [stdout] 169 |   use ::bellpepper_core::{num::AllocatedNum, ConstraintSystem, SynthesisError};
[INFO] [stdout]     |                                                                ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `PhantomData` is imported redundantly
[INFO] [stdout]    --> src/spartan/direct.rs:170:7
[INFO] [stdout]     |
[INFO] [stdout] 167 |   use super::*;
[INFO] [stdout]     |       -------- the item `PhantomData` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 170 |   use core::marker::PhantomData;
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `IntoParallelRefIterator` is imported redundantly
[INFO] [stdout]   --> src/spartan/mod.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 | use rayon::{iter::IntoParallelRefIterator, prelude::*};
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  ---------- the item `IntoParallelRefIterator` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `ConstraintSystem` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:864:46
[INFO] [stdout]     |
[INFO] [stdout] 856 |   use super::*;
[INFO] [stdout]     |       -------- the item `ConstraintSystem` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 864 |   use ::bellpepper_core::{num::AllocatedNum, ConstraintSystem, SynthesisError};
[INFO] [stdout]     |                                              ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the item `PhantomData` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:865:26
[INFO] [stdout]     |
[INFO] [stdout] 856 |   use super::*;
[INFO] [stdout]     |       -------- the item `PhantomData` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 865 |   use core::{fmt::Write, marker::PhantomData};
[INFO] [stdout]     |                          ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: field `0` is never read
[INFO] [stdout]   --> src/bellpepper/test_shape_cs.rs:19:14
[INFO] [stdout]    |
[INFO] [stdout] 19 |   Constraint(usize),
[INFO] [stdout]    |   ---------- ^^^^^
[INFO] [stdout]    |   |
[INFO] [stdout]    |   field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(dead_code)]` implied by `#[deny(unused)]`
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 19 |   Constraint(()),
[INFO] [stdout]    |              ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: field `0` is never read
[INFO] [stdout]   --> src/bellpepper/test_shape_cs.rs:20:7
[INFO] [stdout]    |
[INFO] [stdout] 20 |   Var(Variable),
[INFO] [stdout]    |   --- ^^^^^^^^
[INFO] [stdout]    |   |
[INFO] [stdout]    |   field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 20 |   Var(()),
[INFO] [stdout]    |       ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: method `grab_mut` is never used
[INFO] [stdout]  --> src/gadgets/nonnative/mod.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 7 | trait OptionExt<T> {
[INFO] [stdout]   |       --------- method in this trait
[INFO] [stdout] 8 |   fn grab(&self) -> Result<&T, SynthesisError>;
[INFO] [stdout] 9 |   fn grab_mut(&mut self) -> Result<&mut T, SynthesisError>;
[INFO] [stdout]   |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: method `pow2` is never used
[INFO] [stdout]  --> src/spartan/math.rs:2:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Math {
[INFO] [stdout]   |           ---- method in this trait
[INFO] [stdout] 2 |   fn pow2(self) -> usize;
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 9 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `nova-snark` (lib) due to 10 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: field `0` is never read
[INFO] [stdout]   --> src/bellpepper/test_shape_cs.rs:19:14
[INFO] [stdout]    |
[INFO] [stdout] 19 |   Constraint(usize),
[INFO] [stdout]    |   ---------- ^^^^^
[INFO] [stdout]    |   |
[INFO] [stdout]    |   field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(dead_code)]` implied by `#[deny(unused)]`
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 19 |   Constraint(()),
[INFO] [stdout]    |              ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: field `0` is never read
[INFO] [stdout]   --> src/bellpepper/test_shape_cs.rs:20:7
[INFO] [stdout]    |
[INFO] [stdout] 20 |   Var(Variable),
[INFO] [stdout]    |   --- ^^^^^^^^
[INFO] [stdout]    |   |
[INFO] [stdout]    |   field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 20 |   Var(()),
[INFO] [stdout]    |       ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: method `grab_mut` is never used
[INFO] [stdout]  --> src/gadgets/nonnative/mod.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 7 | trait OptionExt<T> {
[INFO] [stdout]   |       --------- method in this trait
[INFO] [stdout] 8 |   fn grab(&self) -> Result<&T, SynthesisError>;
[INFO] [stdout] 9 |   fn grab_mut(&mut self) -> Result<&mut T, SynthesisError>;
[INFO] [stdout]   |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: method `pow2` is never used
[INFO] [stdout]  --> src/spartan/math.rs:2:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Math {
[INFO] [stdout]   |           ---- method in this trait
[INFO] [stdout] 2 |   fn pow2(self) -> usize;
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 24 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `nova-snark` (lib test) due to 25 previous errors
[INFO] running `Command { std: "docker" "inspect" "b1c4f38f31b46b07fd1843491629a8171c474ff35eb265eb4ce19077769008b7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b1c4f38f31b46b07fd1843491629a8171c474ff35eb265eb4ce19077769008b7", kill_on_drop: false }`
[INFO] [stdout] b1c4f38f31b46b07fd1843491629a8171c474ff35eb265eb4ce19077769008b7
