[INFO] updating cached repository https://github.com/cultural-technology/sunzi
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] bf74d71455ee2e4ca69216da2e67d918b4a405c4
[INFO] testing cultural-technology/sunzi against beta-2020-06-03 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcultural-technology%2Fsunzi" "/workspace/builds/worker-8/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cultural-technology/sunzi on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/cultural-technology/sunzi
[INFO] finished tweaking git repo https://github.com/cultural-technology/sunzi
[INFO] tweaked toml for git repo https://github.com/cultural-technology/sunzi written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/cultural-technology/sunzi already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stdout] e148cf0a9b30db39e2c6ab3dd9e31ece76bf076550caf3f0f6426cca816c9836
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "e148cf0a9b30db39e2c6ab3dd9e31ece76bf076550caf3f0f6426cca816c9836"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling rcmath v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0407]: method `add_usize` is not a member of trait `Step`
[INFO] [stderr]    --> src/big_num.rs:413:5
[INFO] [stderr]     |
[INFO] [stderr] 413 | /     fn add_usize(&self, n: usize) -> Option<BigNum> {
[INFO] [stderr] 414 | |         Some(self.add_usize(n))
[INFO] [stderr] 415 | |     }
[INFO] [stderr]     | |_____^ not a member of trait `Step`
[INFO] [stderr] 
[INFO] [stderr] error[E0407]: method `replace_one` is not a member of trait `Step`
[INFO] [stderr]    --> src/big_num.rs:417:5
[INFO] [stderr]     |
[INFO] [stderr] 417 | /     fn replace_one(&mut self) -> BigNum {
[INFO] [stderr] 418 | |         self.clone()
[INFO] [stderr] 419 | |     }
[INFO] [stderr]     | |_____^ not a member of trait `Step`
[INFO] [stderr] 
[INFO] [stderr] error[E0407]: method `replace_zero` is not a member of trait `Step`
[INFO] [stderr]    --> src/big_num.rs:421:5
[INFO] [stderr]     |
[INFO] [stderr] 421 | /     fn replace_zero(&mut self) -> BigNum {
[INFO] [stderr] 422 | |         self.clone()
[INFO] [stderr] 423 | |     }
[INFO] [stderr]     | |_____^ not a member of trait `Step`
[INFO] [stderr] 
[INFO] [stderr] error[E0407]: method `add_one` is not a member of trait `Step`
[INFO] [stderr]    --> src/big_num.rs:425:5
[INFO] [stderr]     |
[INFO] [stderr] 425 | /     fn add_one(&self) -> BigNum {
[INFO] [stderr] 426 | |         self.clone() + BigNum::new_one()
[INFO] [stderr] 427 | |     }
[INFO] [stderr]     | |_____^ not a member of trait `Step`
[INFO] [stderr] 
[INFO] [stderr] error[E0407]: method `sub_one` is not a member of trait `Step`
[INFO] [stderr]    --> src/big_num.rs:429:5
[INFO] [stderr]     |
[INFO] [stderr] 429 | /     fn sub_one(&self) -> BigNum {
[INFO] [stderr] 430 | |         self.clone() - BigNum::new_one()
[INFO] [stderr] 431 | |     }
[INFO] [stderr]     | |_____^ not a member of trait `Step`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(step_trait)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]   --> src/big_num.rs:58:9
[INFO] [stderr]    |
[INFO] [stderr] 58 |         (BigNum::new_empty()..self.clone())
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Add`
[INFO] [stderr]  --> src/math.rs:3:16
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::ops::{Add, Div, Mul, Rem};
[INFO] [stderr]   |                ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0200]: the trait `std::iter::Step` requires an `unsafe impl` declaration
[INFO] [stderr]    --> src/big_num.rs:408:1
[INFO] [stderr]     |
[INFO] [stderr] 408 | / impl Step for BigNum {
[INFO] [stderr] 409 | |     fn steps_between(start: &BigNum, end: &BigNum) -> Option<usize> {
[INFO] [stderr] 410 | |         let new_num = end - start;
[INFO] [stderr] 411 | |         new_num.to_usize()
[INFO] [stderr] ...   |
[INFO] [stderr] 431 | |     }
[INFO] [stderr] 432 | | }
[INFO] [stderr]     | |_^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 7 previous errors; 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0200, E0407, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0200`.
[INFO] [stderr] error: could not compile `rcmath`.
[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 `"docker" "inspect" "e148cf0a9b30db39e2c6ab3dd9e31ece76bf076550caf3f0f6426cca816c9836"`
[INFO] running `"docker" "rm" "-f" "e148cf0a9b30db39e2c6ab3dd9e31ece76bf076550caf3f0f6426cca816c9836"`
[INFO] [stdout] e148cf0a9b30db39e2c6ab3dd9e31ece76bf076550caf3f0f6426cca816c9836