[INFO] fetching crate bellperson-nonnative 0.4.0...
[INFO] checking bellperson-nonnative-0.4.0 against master#b0696a5160711c068cb1f01b7437db7990d15750 for pr-121848
[INFO] extracting crate bellperson-nonnative 0.4.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate bellperson-nonnative 0.4.0 on toolchain b0696a5160711c068cb1f01b7437db7990d15750
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate bellperson-nonnative 0.4.0
[INFO] finished tweaking crates.io crate bellperson-nonnative 0.4.0
[INFO] tweaked toml for crates.io crate bellperson-nonnative 0.4.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] [stderr]   Downloaded pairing v0.22.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+b0696a5160711c068cb1f01b7437db7990d15750" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] aafe9047d111c0a9029a56479fa841e395d177494b426eb7872b25fb38ab7628
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[INFO] running `Command { std: "docker" "rm" "-f" "aafe9047d111c0a9029a56479fa841e395d177494b426eb7872b25fb38ab7628", kill_on_drop: false }`
[INFO] [stdout] aafe9047d111c0a9029a56479fa841e395d177494b426eb7872b25fb38ab7628
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+b0696a5160711c068cb1f01b7437db7990d15750" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c3bd4ce33acff7c726196ad0a9fe0793412eef4868d3575c92c8d963a447c0db
[INFO] running `Command { std: "docker" "start" "-a" "c3bd4ce33acff7c726196ad0a9fe0793412eef4868d3575c92c8d963a447c0db", kill_on_drop: false }`
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[INFO] [stderr]    Compiling bellperson v0.24.1
[INFO] [stderr]     Checking bellperson-nonnative v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `PrimeField` is imported redundantly
[INFO] [stdout]   --> src/util/convert.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     use super::*;
[INFO] [stdout]    |         -------- the item `PrimeField` is already imported here
[INFO] [stdout] 45 |     use crate::util::scalar::Fr;
[INFO] [stdout] 46 |     use ff::PrimeField;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `From` is imported redundantly
[INFO] [stdout]  --> src/util/num.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::convert::From;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/b0696a5160711c068cb1f01b7437db7990d15750/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] warning: the item `From` is imported redundantly
[INFO] [stdout]   --> src/mp/bignat.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::convert::From;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/b0696a5160711c068cb1f01b7437db7990d15750/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] warning: the item `From` is imported redundantly
[INFO] [stdout]  --> src/util/num.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::convert::From;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/b0696a5160711c068cb1f01b7437db7990d15750/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: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `From` is imported redundantly
[INFO] [stdout]   --> src/mp/bignat.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::convert::From;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/b0696a5160711c068cb1f01b7437db7990d15750/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] warning: method `grab_mut` is never used
[INFO] [stdout]   --> src/lib.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | trait OptionExt<T> {
[INFO] [stdout]    |       --------- method in this trait
[INFO] [stdout] 15 |     fn grab(&self) -> Result<&T, SynthesisError>;
[INFO] [stdout] 16 |     fn grab_mut(&mut self) -> Result<&mut T, SynthesisError>;
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&BigInt` instead of cloning the inner type
[INFO] [stdout]     --> src/mp/bignat.rs:1293:32
[INFO] [stdout]      |
[INFO] [stdout] 1293 |             || Ok(value.grab()?.clone().clone()),
[INFO] [stdout]      |                                ^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `grab_mut` is never used
[INFO] [stdout]   --> src/lib.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | trait OptionExt<T> {
[INFO] [stdout]    |       --------- method in this trait
[INFO] [stdout] 15 |     fn grab(&self) -> Result<&T, SynthesisError>;
[INFO] [stdout] 16 |     fn grab_mut(&mut self) -> Result<&mut T, SynthesisError>;
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&num_bigint::BigInt` instead of cloning the inner type
[INFO] [stdout]     --> src/mp/bignat.rs:1293:32
[INFO] [stdout]      |
[INFO] [stdout] 1293 |             || Ok(value.grab()?.clone().clone()),
[INFO] [stdout]      |                                ^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 14.03s
[INFO] running `Command { std: "docker" "inspect" "c3bd4ce33acff7c726196ad0a9fe0793412eef4868d3575c92c8d963a447c0db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3bd4ce33acff7c726196ad0a9fe0793412eef4868d3575c92c8d963a447c0db", kill_on_drop: false }`
[INFO] [stdout] c3bd4ce33acff7c726196ad0a9fe0793412eef4868d3575c92c8d963a447c0db
