[INFO] cloning repository https://github.com/pebble8888/modular-polynomial
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/pebble8888/modular-polynomial" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpebble8888%2Fmodular-polynomial", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpebble8888%2Fmodular-polynomial'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5a3c3a239d534a423869fb12f743e4aced35c02e
[INFO] testing pebble8888/modular-polynomial against beta-2021-09-12 for beta-1.56-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpebble8888%2Fmodular-polynomial" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/pebble8888/modular-polynomial on toolchain beta-2021-09-12
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-12" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/pebble8888/modular-polynomial
[INFO] finished tweaking git repo https://github.com/pebble8888/modular-polynomial
[INFO] tweaked toml for git repo https://github.com/pebble8888/modular-polynomial written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/pebble8888/modular-polynomial already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-12" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded impl_ops v0.1.1
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-12" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 684f2c6fd7a438b606bf0d9410cc8e5f1ec33cbd4da8325fc88df3f1e3c9760c
[INFO] running `Command { std: "docker" "start" "-a" "684f2c6fd7a438b606bf0d9410cc8e5f1ec33cbd4da8325fc88df3f1e3c9760c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "684f2c6fd7a438b606bf0d9410cc8e5f1ec33cbd4da8325fc88df3f1e3c9760c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "684f2c6fd7a438b606bf0d9410cc8e5f1ec33cbd4da8325fc88df3f1e3c9760c", kill_on_drop: false }`
[INFO] [stdout] 684f2c6fd7a438b606bf0d9410cc8e5f1ec33cbd4da8325fc88df3f1e3c9760c
[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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-12" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cb39c04168c497a33b214a08b8fed050ea0243ef11492a030dcc0cabda7ece9b
[INFO] running `Command { std: "docker" "start" "-a" "cb39c04168c497a33b214a08b8fed050ea0243ef11492a030dcc0cabda7ece9b", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.4
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]    Compiling primes v0.2.3
[INFO] [stderr]    Compiling impl_ops v0.1.1
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling num-rational v0.2.2
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling num-complex v0.2.3
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling num v0.2.0
[INFO] [stderr]    Compiling ellipticcurve v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0658]: use of unstable library feature 'int_roundings'
[INFO] [stdout]    --> src/polynomial.rs:538:34
[INFO] [stdout]     |
[INFO] [stdout] 538 |                 let y = u.ypow().div_floor(&2);
[INFO] [stdout]     |                                  ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #88581 <https://github.com/rust-lang/rust/issues/88581> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/polynomial.rs:538:44
[INFO] [stdout]     |
[INFO] [stdout] 538 |                 let y = u.ypow().div_floor(&2);
[INFO] [stdout]     |                                            ^^ expected `i32`, found `&{integer}`
[INFO] [stdout]     |
[INFO] [stdout] help: consider removing the borrow
[INFO] [stdout]     |
[INFO] [stdout] 538 -                 let y = u.ypow().div_floor(&2);
[INFO] [stdout] 538 +                 let y = u.ypow().div_floor(2);
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'int_roundings'
[INFO] [stdout]    --> src/polynomial.rs:564:34
[INFO] [stdout]     |
[INFO] [stdout] 564 |                 let y = u.ypow().div_floor(&2);
[INFO] [stdout]     |                                  ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #88581 <https://github.com/rust-lang/rust/issues/88581> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/polynomial.rs:564:44
[INFO] [stdout]     |
[INFO] [stdout] 564 |                 let y = u.ypow().div_floor(&2);
[INFO] [stdout]     |                                            ^^ expected `i32`, found `&{integer}`
[INFO] [stdout]     |
[INFO] [stdout] help: consider removing the borrow
[INFO] [stdout]     |
[INFO] [stdout] 564 -                 let y = u.ypow().div_floor(&2);
[INFO] [stdout] 564 +                 let y = u.ypow().div_floor(2);
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'int_roundings'
[INFO] [stdout]   --> src/division_polynomial.rs:37:25
[INFO] [stdout]    |
[INFO] [stdout] 37 |         let m = (n - 1).div_floor(&2);
[INFO] [stdout]    |                         ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #88581 <https://github.com/rust-lang/rust/issues/88581> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/division_polynomial.rs:37:35
[INFO] [stdout]    |
[INFO] [stdout] 37 |         let m = (n - 1).div_floor(&2);
[INFO] [stdout]    |                                   ^^ expected `i32`, found `&{integer}`
[INFO] [stdout]    |
[INFO] [stdout] help: consider removing the borrow
[INFO] [stdout]    |
[INFO] [stdout] 37 -         let m = (n - 1).div_floor(&2);
[INFO] [stdout] 37 +         let m = (n - 1).div_floor(2);
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'int_roundings'
[INFO] [stdout]   --> src/division_polynomial.rs:45:19
[INFO] [stdout]    |
[INFO] [stdout] 45 |         let m = n.div_floor(&2);
[INFO] [stdout]    |                   ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #88581 <https://github.com/rust-lang/rust/issues/88581> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/division_polynomial.rs:45:29
[INFO] [stdout]    |
[INFO] [stdout] 45 |         let m = n.div_floor(&2);
[INFO] [stdout]    |                             ^^ expected `i32`, found `&{integer}`
[INFO] [stdout]    |
[INFO] [stdout] help: consider removing the borrow
[INFO] [stdout]    |
[INFO] [stdout] 45 -         let m = n.div_floor(&2);
[INFO] [stdout] 45 +         let m = n.div_floor(2);
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 8 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ellipticcurve` due to 9 previous errors
[INFO] running `Command { std: "docker" "inspect" "cb39c04168c497a33b214a08b8fed050ea0243ef11492a030dcc0cabda7ece9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cb39c04168c497a33b214a08b8fed050ea0243ef11492a030dcc0cabda7ece9b", kill_on_drop: false }`
[INFO] [stdout] cb39c04168c497a33b214a08b8fed050ea0243ef11492a030dcc0cabda7ece9b