[INFO] fetching crate polyglot_interpreter 1.4.0...
[INFO] checking polyglot_interpreter-1.4.0 against master#8a703520e80d87d4423c01f9d4fbc9e5f6533a02 for pr-154205-1
[INFO] extracting crate polyglot_interpreter 1.4.0 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate polyglot_interpreter 1.4.0
[INFO] finished tweaking crates.io crate polyglot_interpreter 1.4.0
[INFO] tweaked toml for crates.io crate polyglot_interpreter 1.4.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate polyglot_interpreter 1.4.0 on toolchain 8a703520e80d87d4423c01f9d4fbc9e5f6533a02
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8a703520e80d87d4423c01f9d4fbc9e5f6533a02" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate polyglot_interpreter 1.4.0 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" "+8a703520e80d87d4423c01f9d4fbc9e5f6533a02" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "+8a703520e80d87d4423c01f9d4fbc9e5f6533a02" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fa38c75d08dfb4275d6368863d6044a7f5ec69773ae0c2cd2ffb87f9346a5dc2
[INFO] running `Command { std: "docker" "start" "-a" "fa38c75d08dfb4275d6368863d6044a7f5ec69773ae0c2cd2ffb87f9346a5dc2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fa38c75d08dfb4275d6368863d6044a7f5ec69773ae0c2cd2ffb87f9346a5dc2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa38c75d08dfb4275d6368863d6044a7f5ec69773ae0c2cd2ffb87f9346a5dc2", kill_on_drop: false }`
[INFO] [stdout] fa38c75d08dfb4275d6368863d6044a7f5ec69773ae0c2cd2ffb87f9346a5dc2
[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=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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+8a703520e80d87d4423c01f9d4fbc9e5f6533a02" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a38fbb64cc6fe29d1d5f04814b49fd77812be02107406d3b83774b8e584645b9
[INFO] running `Command { std: "docker" "start" "-a" "a38fbb64cc6fe29d1d5f04814b49fd77812be02107406d3b83774b8e584645b9", kill_on_drop: false }`
[INFO] [stderr]     Checking polyglot_interpreter v1.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable `char_count` is assigned to, but never used
[INFO] [stdout]    --> src/lib.rs:142:17
[INFO] [stdout]     |
[INFO] [stdout] 142 |             let mut char_count = 0;
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_char_count` instead
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `char_count` is never read
[INFO] [stdout]    --> src/lib.rs:148:17
[INFO] [stdout]     |
[INFO] [stdout] 148 |                 char_count += 1;
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `char_count` is assigned to, but never used
[INFO] [stdout]    --> src/lib.rs:142:17
[INFO] [stdout]     |
[INFO] [stdout] 142 |             let mut char_count = 0;
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_char_count` instead
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `char_count` is never read
[INFO] [stdout]    --> src/lib.rs:148:17
[INFO] [stdout]     |
[INFO] [stdout] 148 |                 char_count += 1;
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.34s
[INFO] running `Command { std: "docker" "inspect" "a38fbb64cc6fe29d1d5f04814b49fd77812be02107406d3b83774b8e584645b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a38fbb64cc6fe29d1d5f04814b49fd77812be02107406d3b83774b8e584645b9", kill_on_drop: false }`
[INFO] [stdout] a38fbb64cc6fe29d1d5f04814b49fd77812be02107406d3b83774b8e584645b9