[INFO] cloning repository https://github.com/seritools/rust-exercises
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/seritools/rust-exercises" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fseritools%2Frust-exercises", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fseritools%2Frust-exercises'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cd6ef05e36dcc533f2fc4876a87b57893f061e7d
[INFO] checking seritools/rust-exercises against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fseritools%2Frust-exercises" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/seritools/rust-exercises on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/seritools/rust-exercises
[INFO] finished tweaking git repo https://github.com/seritools/rust-exercises
[INFO] tweaked toml for git repo https://github.com/seritools/rust-exercises written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/seritools/rust-exercises already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 83cf372b8cd95c8908f24ad48b98b2fff90c337a703fce35a4f98f0695ac1067
[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" "83cf372b8cd95c8908f24ad48b98b2fff90c337a703fce35a4f98f0695ac1067", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "83cf372b8cd95c8908f24ad48b98b2fff90c337a703fce35a4f98f0695ac1067", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "83cf372b8cd95c8908f24ad48b98b2fff90c337a703fce35a4f98f0695ac1067", kill_on_drop: false }`
[INFO] [stdout] 83cf372b8cd95c8908f24ad48b98b2fff90c337a703fce35a4f98f0695ac1067
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 617b272c189d076d5a0fa610073250fb44d21ecc81f4241d5e5fdd3dbd4c677a
[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" "617b272c189d076d5a0fa610073250fb44d21ecc81f4241d5e5fdd3dbd4c677a", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]     Checking rust-exercises v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]  --> src/bin/generic-numbers.rs:8:28
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn modulo<T: std::ops::Add + std::ops::Rem + std::cmp::PartialOrd>(a: T, b: T) -> T {
[INFO] [stdout]   |           - this type parameter
[INFO] [stdout] 7 |     // We're going to exploit the property that, where a is negative, a % b == a mod b - b
[INFO] [stdout] 8 |     let rem_error = if a < 0 { b } else { 0 };
[INFO] [stdout]   |                            ^ expected type parameter `T`, found integer
[INFO] [stdout]   |
[INFO] [stdout]   = note: expected type parameter `T`
[INFO] [stdout]                        found type `{integer}`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]  --> src/bin/generic-numbers.rs:8:28
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn modulo<T: std::ops::Add + std::ops::Rem + std::cmp::PartialOrd>(a: T, b: T) -> T {
[INFO] [stdout]   |           - this type parameter
[INFO] [stdout] 7 |     // We're going to exploit the property that, where a is negative, a % b == a mod b - b
[INFO] [stdout] 8 |     let rem_error = if a < 0 { b } else { 0 };
[INFO] [stdout]   |                            ^ expected type parameter `T`, found integer
[INFO] [stdout]   |
[INFO] [stdout]   = note: expected type parameter `T`
[INFO] [stdout]                        found type `{integer}`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: `if` and `else` have incompatible types
[INFO] [stdout]  --> src/bin/generic-numbers.rs:8:43
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn modulo<T: std::ops::Add + std::ops::Rem + std::cmp::PartialOrd>(a: T, b: T) -> T {
[INFO] [stdout]   |           - this type parameter
[INFO] [stdout] 7 |     // We're going to exploit the property that, where a is negative, a % b == a mod b - b
[INFO] [stdout] 8 |     let rem_error = if a < 0 { b } else { 0 };
[INFO] [stdout]   |                                -          ^ expected type parameter `T`, found integer
[INFO] [stdout]   |                                |
[INFO] [stdout]   |                                expected because of this
[INFO] [stdout]   |
[INFO] [stdout]   = note: expected type `T`
[INFO] [stdout]              found type `{integer}`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: `if` and `else` have incompatible types
[INFO] [stdout]  --> src/bin/generic-numbers.rs:8:43
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn modulo<T: std::ops::Add + std::ops::Rem + std::cmp::PartialOrd>(a: T, b: T) -> T {
[INFO] [stdout]   |           - this type parameter
[INFO] [stdout] 7 |     // We're going to exploit the property that, where a is negative, a % b == a mod b - b
[INFO] [stdout] 8 |     let rem_error = if a < 0 { b } else { 0 };
[INFO] [stdout]   |                                -          ^ expected type parameter `T`, found integer
[INFO] [stdout]   |                                |
[INFO] [stdout]   |                                expected because of this
[INFO] [stdout]   |
[INFO] [stdout]   = note: expected type `T`
[INFO] [stdout]              found type `{integer}`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0369]: cannot add `_` to `<T as Rem>::Output`
[INFO] [stdout]  --> src/bin/generic-numbers.rs:9:11
[INFO] [stdout]   |
[INFO] [stdout] 9 |     a % b + rem_error
[INFO] [stdout]   |     ----- ^ --------- _
[INFO] [stdout]   |     |
[INFO] [stdout]   |     <T as Rem>::Output
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0369.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stdout] error[E0369]: cannot add `_` to `<T as Rem>::Output`
[INFO] [stdout]  --> src/bin/generic-numbers.rs:9:11
[INFO] [stdout]   |
[INFO] [stdout] 9 |     a % b + rem_error
[INFO] [stdout]   |     ----- ^ --------- _
[INFO] [stdout]   |     |
[INFO] [stdout]   |     <T as Rem>::Output
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0369.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-exercises`
[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] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "617b272c189d076d5a0fa610073250fb44d21ecc81f4241d5e5fdd3dbd4c677a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "617b272c189d076d5a0fa610073250fb44d21ecc81f4241d5e5fdd3dbd4c677a", kill_on_drop: false }`
[INFO] [stdout] 617b272c189d076d5a0fa610073250fb44d21ecc81f4241d5e5fdd3dbd4c677a