[INFO] fetching crate rustnomial 0.0.7...
[INFO] checking rustnomial-0.0.7 against master#d62d3f7fa9a91d933213cc10e20e740608983f64 for pr-77015
[INFO] extracting crate rustnomial 0.0.7 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate rustnomial 0.0.7 on toolchain d62d3f7fa9a91d933213cc10e20e740608983f64
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rustnomial 0.0.7
[INFO] finished tweaking crates.io crate rustnomial 0.0.7
[INFO] tweaked toml for crates.io crate rustnomial 0.0.7 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 821e607ce84740681c786a9995b2767abe787100745235485133e810eeae07dd
[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" "821e607ce84740681c786a9995b2767abe787100745235485133e810eeae07dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "821e607ce84740681c786a9995b2767abe787100745235485133e810eeae07dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "821e607ce84740681c786a9995b2767abe787100745235485133e810eeae07dd", kill_on_drop: false }`
[INFO] [stdout] 821e607ce84740681c786a9995b2767abe787100745235485133e810eeae07dd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f4b35df0440239ce4a948246cb3ca3dc0e1602ebf5f6b3edec0e84dc5b0dbd7c
[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" "f4b35df0440239ce4a948246cb3ca3dc0e1602ebf5f6b3edec0e84dc5b0dbd7c", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling num-bigint v0.3.0
[INFO] [stderr]    Compiling num-iter v0.1.41
[INFO] [stderr]    Compiling num-rational v0.3.0
[INFO] [stderr]     Checking num-complex v0.3.0
[INFO] [stderr]     Checking num v0.3.0
[INFO] [stderr]     Checking rustnomial v0.0.7 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/rustnomial/sparsepolynomial.rs:942:13
[INFO] [stdout]     |
[INFO] [stdout] 942 |         let b: SparsePolynomial<u16> = a.into();
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `degree` found for struct `Polynomial<{integer}>` in the current scope
[INFO] [stdout]   --> src/benchmarks/bench.rs:75:32
[INFO] [stdout]    |
[INFO] [stdout] 75 |         b.iter(|| black_box(ap.degree()));
[INFO] [stdout]    |                                ^^^^^^ method not found in `Polynomial<{integer}>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is in scope
[INFO] [stdout]    = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
[INFO] [stdout]            `use rustnomial::GenericPolynomial;`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `degree` found for struct `Polynomial<{integer}>` in the current scope
[INFO] [stdout]   --> src/benchmarks/bench.rs:81:32
[INFO] [stdout]    |
[INFO] [stdout] 81 |         b.iter(|| black_box(ap.degree()));
[INFO] [stdout]    |                                ^^^^^^ method not found in `Polynomial<{integer}>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is in scope
[INFO] [stdout]    = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
[INFO] [stdout]            `use rustnomial::GenericPolynomial;`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `degree` found for struct `SparsePolynomial<{integer}>` in the current scope
[INFO] [stdout]   --> src/benchmarks/bench.rs:89:32
[INFO] [stdout]    |
[INFO] [stdout] 89 |         b.iter(|| black_box(ap.degree()));
[INFO] [stdout]    |                                ^^^^^^ method not found in `SparsePolynomial<{integer}>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is in scope
[INFO] [stdout]    = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
[INFO] [stdout]            `use rustnomial::GenericPolynomial;`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustnomial`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "f4b35df0440239ce4a948246cb3ca3dc0e1602ebf5f6b3edec0e84dc5b0dbd7c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4b35df0440239ce4a948246cb3ca3dc0e1602ebf5f6b3edec0e84dc5b0dbd7c", kill_on_drop: false }`
[INFO] [stdout] f4b35df0440239ce4a948246cb3ca3dc0e1602ebf5f6b3edec0e84dc5b0dbd7c