[INFO] cloning repository https://github.com/pdrolopes/crafting_interpreters
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/pdrolopes/crafting_interpreters" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpdrolopes%2Fcrafting_interpreters", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpdrolopes%2Fcrafting_interpreters'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 79deb1cc0de91a58f0fa4707200d550d065d7fd9
[INFO] building pdrolopes/crafting_interpreters against master#c7f6aa2869acdbf014d094c6e427e554e160b6db for pr-146237-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpdrolopes%2Fcrafting_interpreters" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/pdrolopes/crafting_interpreters
[INFO] finished tweaking git repo https://github.com/pdrolopes/crafting_interpreters
[INFO] tweaked toml for git repo https://github.com/pdrolopes/crafting_interpreters written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/pdrolopes/crafting_interpreters on toolchain c7f6aa2869acdbf014d094c6e427e554e160b6db
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/pdrolopes/crafting_interpreters 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" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded dyn-clone v1.0.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a9d1e0446888031a1b6146715db3db69d4ccb0afd204a0efee44cb99e72d0255
[INFO] running `Command { std: "docker" "start" "-a" "a9d1e0446888031a1b6146715db3db69d4ccb0afd204a0efee44cb99e72d0255", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a9d1e0446888031a1b6146715db3db69d4ccb0afd204a0efee44cb99e72d0255", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9d1e0446888031a1b6146715db3db69d4ccb0afd204a0efee44cb99e72d0255", kill_on_drop: false }`
[INFO] [stdout] a9d1e0446888031a1b6146715db3db69d4ccb0afd204a0efee44cb99e72d0255
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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=forbid" "-e" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 39fabfdff5520733712fc9ed99f4bce5138d8b7f10c548391efe372fa351a1ea
[INFO] running `Command { std: "docker" "start" "-a" "39fabfdff5520733712fc9ed99f4bce5138d8b7f10c548391efe372fa351a1ea", kill_on_drop: false }`
[INFO] [stderr]    Compiling dyn-clone v1.0.3
[INFO] [stderr]    Compiling crafting_interpreters v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `peekable_next_if` has been stable since 1.51.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(peekable_next_if)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `hash_drain_filter`
[INFO] [stdout]  --> src/main.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(hash_drain_filter)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `token`
[INFO] [stdout]   --> src/ast_printer.rs:88:35
[INFO] [stdout]    |
[INFO] [stdout] 88 |     fn visit_this_expr(&mut self, token: &Token, _id: u64) -> String {
[INFO] [stdout]    |                                   ^^^^^ help: if this is intentional, prefix it with an underscore: `_token`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `token`
[INFO] [stdout]    --> src/ast_printer.rs:175:35
[INFO] [stdout]     |
[INFO] [stdout] 175 |     fn visit_this_expr(&mut self, token: &Token, _id: u64) -> String {
[INFO] [stdout]     |                                   ^^^^^ help: if this is intentional, prefix it with an underscore: `_token`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `crafting_interpreters` (bin "crafting_interpreters") due to 1 previous error; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "39fabfdff5520733712fc9ed99f4bce5138d8b7f10c548391efe372fa351a1ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39fabfdff5520733712fc9ed99f4bce5138d8b7f10c548391efe372fa351a1ea", kill_on_drop: false }`
[INFO] [stdout] 39fabfdff5520733712fc9ed99f4bce5138d8b7f10c548391efe372fa351a1ea