[INFO] fetching crate rustnomial 0.0.7...
[INFO] checking rustnomial-0.0.7 against try#3e22d1f9053c0fc87629b3c6d5d9567856368e5d for pr-78714
[INFO] extracting crate rustnomial 0.0.7 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate rustnomial 0.0.7 on toolchain 3e22d1f9053c0fc87629b3c6d5d9567856368e5d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e22d1f9053c0fc87629b3c6d5d9567856368e5d" "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-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e22d1f9053c0fc87629b3c6d5d9567856368e5d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e22d1f9053c0fc87629b3c6d5d9567856368e5d" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded roots v0.0.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+3e22d1f9053c0fc87629b3c6d5d9567856368e5d" "metadata" "--no-deps" "--format-version=1", 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] 7c20697d7ca2222ae314929c90b7c522e257a031f3697182253ee7565d3244d8
[INFO] running `Command { std: "docker" "start" "-a" "7c20697d7ca2222ae314929c90b7c522e257a031f3697182253ee7565d3244d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7c20697d7ca2222ae314929c90b7c522e257a031f3697182253ee7565d3244d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7c20697d7ca2222ae314929c90b7c522e257a031f3697182253ee7565d3244d8", kill_on_drop: false }`
[INFO] [stdout] 7c20697d7ca2222ae314929c90b7c522e257a031f3697182253ee7565d3244d8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+3e22d1f9053c0fc87629b3c6d5d9567856368e5d" "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] 973cb9b3f05720fba851314c051cb67a8990df2f3d8adc97f8561e51444c4f73
[INFO] running `Command { std: "docker" "start" "-a" "973cb9b3f05720fba851314c051cb67a8990df2f3d8adc97f8561e51444c4f73", kill_on_drop: false }`
[INFO] [stderr]     Checking roots v0.0.6
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.3.1
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]     Checking num-complex v0.3.1
[INFO] [stderr]     Checking num v0.3.1
[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" "973cb9b3f05720fba851314c051cb67a8990df2f3d8adc97f8561e51444c4f73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "973cb9b3f05720fba851314c051cb67a8990df2f3d8adc97f8561e51444c4f73", kill_on_drop: false }`
[INFO] [stdout] 973cb9b3f05720fba851314c051cb67a8990df2f3d8adc97f8561e51444c4f73