[INFO] cloning repository https://github.com/gusbicalho/crafting-interpreters-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gusbicalho/crafting-interpreters-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgusbicalho%2Fcrafting-interpreters-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgusbicalho%2Fcrafting-interpreters-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c44d8f55e0e263ea923b6a3b611efeeec3226a75
[INFO] testing gusbicalho/crafting-interpreters-rs against 1.95.0 for beta-1.96-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgusbicalho%2Fcrafting-interpreters-rs" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/gusbicalho/crafting-interpreters-rs
[INFO] finished tweaking git repo https://github.com/gusbicalho/crafting-interpreters-rs
[INFO] tweaked toml for git repo https://github.com/gusbicalho/crafting-interpreters-rs written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/gusbicalho/crafting-interpreters-rs on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/gusbicalho/crafting-interpreters-rs 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" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded num v0.4.0
[INFO] [stderr]   Downloaded num-iter v0.1.43
[INFO] [stderr]   Downloaded num-complex v0.4.2
[INFO] [stderr]   Downloaded rangemap v1.0.3
[INFO] [stderr]   Downloaded num-bigint v0.4.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5503625a07bf6763604c0eeea892d802f509508be502119ca2f1392d10b287d3
[INFO] running `Command { std: "docker" "start" "-a" "5503625a07bf6763604c0eeea892d802f509508be502119ca2f1392d10b287d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5503625a07bf6763604c0eeea892d802f509508be502119ca2f1392d10b287d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5503625a07bf6763604c0eeea892d802f509508be502119ca2f1392d10b287d3", kill_on_drop: false }`
[INFO] [stdout] 5503625a07bf6763604c0eeea892d802f509508be502119ca2f1392d10b287d3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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" "+1.95.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] de818bc0e7d2027159e0ff53f6cb1d2ec221b4c416e32732b4d1fae6e5f8c59c
[INFO] running `Command { std: "docker" "start" "-a" "de818bc0e7d2027159e0ff53f6cb1d2ec221b4c416e32732b4d1fae6e5f8c59c", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stderr]    Compiling num-rational v0.4.1
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling rangemap v1.0.3
[INFO] [stderr]    Compiling num-complex v0.4.2
[INFO] [stderr]    Compiling num v0.4.0
[INFO] [stderr]    Compiling crafting-interpreters-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(never_type)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `env` and `io`
[INFO] [stdout]  --> src/cli.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{env, io};
[INFO] [stdout]   |           ^^^  ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/cli.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let mut vm = VM::new();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `crafting-interpreters-rs` (lib) due to 1 previous error; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "de818bc0e7d2027159e0ff53f6cb1d2ec221b4c416e32732b4d1fae6e5f8c59c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de818bc0e7d2027159e0ff53f6cb1d2ec221b4c416e32732b4d1fae6e5f8c59c", kill_on_drop: false }`
[INFO] [stdout] de818bc0e7d2027159e0ff53f6cb1d2ec221b4c416e32732b4d1fae6e5f8c59c