[INFO] cloning repository https://github.com/horou-dsk/algorithm [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/horou-dsk/algorithm" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhorou-dsk%2Falgorithm", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhorou-dsk%2Falgorithm'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 5995946fc51e6117159076c17c94673469f0aaee [INFO] testing horou-dsk/algorithm against 1.55.0 for beta-1.56-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhorou-dsk%2Falgorithm" "/workspace/builds/worker-8/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/horou-dsk/algorithm on toolchain 1.55.0 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/horou-dsk/algorithm [INFO] finished tweaking git repo https://github.com/horou-dsk/algorithm [INFO] tweaked toml for git repo https://github.com/horou-dsk/algorithm written to /workspace/builds/worker-8/source/Cargo.toml [INFO] crate git repo https://github.com/horou-dsk/algorithm already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "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" "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" "+1.55.0" "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] a2192b751306890805d000468410433859e9c16c0e7715e9a19b707c1333f9f1 [INFO] running `Command { std: "docker" "start" "-a" "a2192b751306890805d000468410433859e9c16c0e7715e9a19b707c1333f9f1", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "a2192b751306890805d000468410433859e9c16c0e7715e9a19b707c1333f9f1", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "a2192b751306890805d000468410433859e9c16c0e7715e9a19b707c1333f9f1", kill_on_drop: false }` [INFO] [stdout] a2192b751306890805d000468410433859e9c16c0e7715e9a19b707c1333f9f1 [INFO] running `Command { std: "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" "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" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 9f0f0064b6dab8b37eabccd4558ce5043b7d4a14b3085360372b05cb31d605b7 [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" "9f0f0064b6dab8b37eabccd4558ce5043b7d4a14b3085360372b05cb31d605b7", kill_on_drop: false }` [INFO] [stderr] Compiling algorithm v0.1.0 (/opt/rustwide/workdir) [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 1.56s [INFO] running `Command { std: "docker" "inspect" "9f0f0064b6dab8b37eabccd4558ce5043b7d4a14b3085360372b05cb31d605b7", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "9f0f0064b6dab8b37eabccd4558ce5043b7d4a14b3085360372b05cb31d605b7", kill_on_drop: false }` [INFO] [stdout] 9f0f0064b6dab8b37eabccd4558ce5043b7d4a14b3085360372b05cb31d605b7 [INFO] running `Command { std: "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" "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" "+1.55.0" "test" "--frozen" "--no-run" "--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] 65fac213588d4a9e2853afcbeda4de83619157677b62953eab1abbf011bbb76d [INFO] running `Command { std: "docker" "start" "-a" "65fac213588d4a9e2853afcbeda4de83619157677b62953eab1abbf011bbb76d", kill_on_drop: false }` [INFO] [stderr] Compiling algorithm v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused import: `std::time::Instant` [INFO] [stdout] --> examples/in_and_post_order_create_binary_tree/main.rs:3:5 [INFO] [stdout] | [INFO] [stdout] 3 | use std::time::Instant; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::time::Instant` [INFO] [stdout] --> examples/binary_tree_right_node/main.rs:3:5 [INFO] [stdout] | [INFO] [stdout] 3 | use std::time::Instant; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::time::Instant` [INFO] [stdout] --> examples/binary_search_tree_insert/main.rs:3:5 [INFO] [stdout] | [INFO] [stdout] 3 | use std::time::Instant; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::time::Instant` [INFO] [stdout] --> examples/binary_search_tree_min_diff/main.rs:3:5 [INFO] [stdout] | [INFO] [stdout] 3 | use std::time::Instant; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `Duration` [INFO] [stdout] --> examples/common_chars/main.rs:1:26 [INFO] [stdout] | [INFO] [stdout] 1 | use std::time::{Instant, Duration}; [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::thread` [INFO] [stdout] --> examples/common_chars/main.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::thread; [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `build_tree` [INFO] [stdout] --> examples/in_and_post_order_create_binary_tree/main.rs:83:4 [INFO] [stdout] | [INFO] [stdout] 83 | fn build_tree(inorder: Vec, postorder: Vec) -> Option>> { [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0499]: cannot borrow `*h` as mutable more than once at a time [INFO] [stdout] --> examples/remove_nth_from_end/main.rs:63:18 [INFO] [stdout] | [INFO] [stdout] 62 | prev = unsafe { &mut *h }; [INFO] [stdout] | ------- first mutable borrow occurs here [INFO] [stdout] 63 | h = &mut h.as_mut().unwrap().next; [INFO] [stdout] | ^ second mutable borrow occurs here [INFO] [stdout] ... [INFO] [stdout] 66 | if let Some(p) = prev.as_mut() { [INFO] [stdout] | ---- first borrow later used here [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unnecessary `unsafe` block [INFO] [stdout] --> examples/remove_nth_from_end/main.rs:62:16 [INFO] [stdout] | [INFO] [stdout] 62 | prev = unsafe { &mut *h }; [INFO] [stdout] | ^^^^^^ unnecessary `unsafe` block [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_unsafe)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to previous error; 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0499`. [INFO] [stdout] [INFO] [stderr] error: could not compile `algorithm` due to 2 previous errors; 1 warning emitted [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stdout] warning: constant is never used: `ASCII_A` [INFO] [stdout] --> examples/common_chars/main.rs:15:1 [INFO] [stdout] | [INFO] [stdout] 15 | const ASCII_A: u8 = 'a' as u8; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `common_a_chars` [INFO] [stdout] --> examples/common_chars/main.rs:17:4 [INFO] [stdout] | [INFO] [stdout] 17 | fn common_a_chars(a: Vec) -> Vec { [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: build failed [INFO] running `Command { std: "docker" "inspect" "65fac213588d4a9e2853afcbeda4de83619157677b62953eab1abbf011bbb76d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "65fac213588d4a9e2853afcbeda4de83619157677b62953eab1abbf011bbb76d", kill_on_drop: false }` [INFO] [stdout] 65fac213588d4a9e2853afcbeda4de83619157677b62953eab1abbf011bbb76d