[INFO] cloning repository https://github.com/hatoo/read_to_char_vec_benchmark [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hatoo/read_to_char_vec_benchmark" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhatoo%2Fread_to_char_vec_benchmark", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhatoo%2Fread_to_char_vec_benchmark'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] e19edd599c357569e1306c30e462405456289f9b [INFO] testing hatoo/read_to_char_vec_benchmark against beta-2026-04-21 for beta-1.96-2 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhatoo%2Fread_to_char_vec_benchmark" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'... [INFO] [stderr] done. [INFO] started tweaking git repo https://github.com/hatoo/read_to_char_vec_benchmark [INFO] finished tweaking git repo https://github.com/hatoo/read_to_char_vec_benchmark [INFO] tweaked toml for git repo https://github.com/hatoo/read_to_char_vec_benchmark written to /workspace/builds/worker-6-tc2/source/Cargo.toml [INFO] validating manifest of git repo https://github.com/hatoo/read_to_char_vec_benchmark on toolchain beta-2026-04-21 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate git repo https://github.com/hatoo/read_to_char_vec_benchmark already has a lockfile, it will not be regenerated [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 01e168b7fe3bc9a1760664351720de04aafd756e395d6d7cfc260b03f8128430 [INFO] running `Command { std: "docker" "start" "-a" "01e168b7fe3bc9a1760664351720de04aafd756e395d6d7cfc260b03f8128430", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "01e168b7fe3bc9a1760664351720de04aafd756e395d6d7cfc260b03f8128430", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "01e168b7fe3bc9a1760664351720de04aafd756e395d6d7cfc260b03f8128430", kill_on_drop: false }` [INFO] [stdout] 01e168b7fe3bc9a1760664351720de04aafd756e395d6d7cfc260b03f8128430 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] f092ee960ecabc8f246b70a3c4055d930990a2caeae71f8023850be29f4ba30b [INFO] running `Command { std: "docker" "start" "-a" "f092ee960ecabc8f246b70a3c4055d930990a2caeae71f8023850be29f4ba30b", kill_on_drop: false }` [INFO] [stderr] Compiling arrayvec v0.4.10 [INFO] [stderr] Compiling cfg-if v0.1.6 [INFO] [stderr] Compiling nodrop v0.1.13 [INFO] [stderr] Compiling libc v0.2.46 [INFO] [stderr] Compiling memoffset v0.2.1 [INFO] [stderr] Compiling scopeguard v0.3.3 [INFO] [stderr] Compiling rayon-core v1.4.1 [INFO] [stderr] Compiling lazy_static v1.2.0 [INFO] [stderr] Compiling void v1.0.2 [INFO] [stderr] Compiling rayon v1.0.3 [INFO] [stderr] Compiling either v1.5.0 [INFO] [stderr] Compiling unreachable v1.0.0 [INFO] [stderr] Compiling crossbeam-utils v0.2.2 [INFO] [stderr] Compiling smallvec v0.6.7 [INFO] [stderr] Compiling ropey v1.0.0 [INFO] [stderr] Compiling num_cpus v1.9.0 [INFO] [stderr] Compiling crossbeam-epoch v0.3.1 [INFO] [stderr] Compiling crossbeam-deque v0.2.0 [INFO] [stderr] Compiling read_to_char_vec_benchmark v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel [INFO] [stdout] --> src/main.rs:1:1 [INFO] [stdout] | [INFO] [stdout] 1 | #![feature(test)] [INFO] [stdout] | ^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::fs` [INFO] [stdout] --> src/main.rs:6:5 [INFO] [stdout] | [INFO] [stdout] 6 | use std::fs; [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::io::BufRead` [INFO] [stdout] --> src/main.rs:7:5 [INFO] [stdout] | [INFO] [stdout] 7 | use std::io::BufRead; [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::io::BufReader` [INFO] [stdout] --> src/main.rs:8:5 [INFO] [stdout] | [INFO] [stdout] 8 | use std::io::BufReader; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: `...` range patterns are deprecated [INFO] [stdout] --> src/main.rs:97:25 [INFO] [stdout] | [INFO] [stdout] 97 | 0b_0000_0000...0b_0111_1111 => Some(Ok(buf[0] as char)), [INFO] [stdout] | ^^^ help: use `..=` for an inclusive range [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] = note: `#[warn(ellipsis_inclusive_range_patterns)]` (part of `#[warn(rust_2021_compatibility)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: `...` range patterns are deprecated [INFO] [stdout] --> src/main.rs:98:25 [INFO] [stdout] | [INFO] [stdout] 98 | 0b_1100_0000...0b_1101_1111 => self.to_utf8_char(&mut buf, 1), [INFO] [stdout] | ^^^ help: use `..=` for an inclusive range [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: `...` range patterns are deprecated [INFO] [stdout] --> src/main.rs:99:25 [INFO] [stdout] | [INFO] [stdout] 99 | 0b_1110_0000...0b_1110_1111 => self.to_utf8_char(&mut buf, 2), [INFO] [stdout] | ^^^ help: use `..=` for an inclusive range [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: `...` range patterns are deprecated [INFO] [stdout] --> src/main.rs:100:25 [INFO] [stdout] | [INFO] [stdout] 100 | 0b_1111_0000...0b_1111_0111 => self.to_utf8_char(&mut buf, 3), [INFO] [stdout] | ^^^ help: use `..=` for an inclusive range [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `rayon::prelude` [INFO] [stdout] --> src/main.rs:5:5 [INFO] [stdout] | [INFO] [stdout] 5 | use rayon::prelude::*; [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0554`. [INFO] [stdout] [INFO] [stderr] error: could not compile `read_to_char_vec_benchmark` (bin "read_to_char_vec_benchmark") due to 1 previous error; 8 warnings emitted [INFO] running `Command { std: "docker" "inspect" "f092ee960ecabc8f246b70a3c4055d930990a2caeae71f8023850be29f4ba30b", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "f092ee960ecabc8f246b70a3c4055d930990a2caeae71f8023850be29f4ba30b", kill_on_drop: false }` [INFO] [stdout] f092ee960ecabc8f246b70a3c4055d930990a2caeae71f8023850be29f4ba30b