[INFO] cloning repository https://github.com/tquang1708/rs_basic_compressor
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tquang1708/rs_basic_compressor" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftquang1708%2Frs_basic_compressor", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftquang1708%2Frs_basic_compressor'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5fa570bd18342fb3cb1bda28fd2e730870bee27f
[INFO] checking tquang1708/rs_basic_compressor against master#33fdb797f59421c7bbecaa4588ed5d7a31a9494a for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftquang1708%2Frs_basic_compressor" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tquang1708/rs_basic_compressor on toolchain 33fdb797f59421c7bbecaa4588ed5d7a31a9494a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tquang1708/rs_basic_compressor
[INFO] finished tweaking git repo https://github.com/tquang1708/rs_basic_compressor
[INFO] tweaked toml for git repo https://github.com/tquang1708/rs_basic_compressor written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/tquang1708/rs_basic_compressor already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 91d1b47d0d307e61980066b30b51b91d85d79f687f8ca356fcceee1508fe3957
[INFO] running `Command { std: "docker" "start" "-a" "91d1b47d0d307e61980066b30b51b91d85d79f687f8ca356fcceee1508fe3957", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "91d1b47d0d307e61980066b30b51b91d85d79f687f8ca356fcceee1508fe3957", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91d1b47d0d307e61980066b30b51b91d85d79f687f8ca356fcceee1508fe3957", kill_on_drop: false }`
[INFO] [stdout] 91d1b47d0d307e61980066b30b51b91d85d79f687f8ca356fcceee1508fe3957
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6e4eb03f204413702d0433c68c1bcdee871de8c2d919aa22874ee66829864903
[INFO] running `Command { std: "docker" "start" "-a" "6e4eb03f204413702d0433c68c1bcdee871de8c2d919aa22874ee66829864903", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.94
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking yaml-rust v0.3.5
[INFO] [stderr]     Checking textwrap v0.9.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.27.1
[INFO] [stderr]     Checking basic_compressor v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `curr_decoded` is never read
[INFO] [stdout]    --> src/lzw.rs:125:17
[INFO] [stdout]     |
[INFO] [stdout] 125 |         let mut curr_decoded: Vec<u8> = Vec::new();
[INFO] [stdout]     |                 ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `new_entry` is never read
[INFO] [stdout]    --> src/lzw.rs:126:17
[INFO] [stdout]     |
[INFO] [stdout] 126 |         let mut new_entry: Vec<u8> = Vec::new();
[INFO] [stdout]     |                 ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `curr_decoded` is never read
[INFO] [stdout]    --> src/lzw.rs:125:17
[INFO] [stdout]     |
[INFO] [stdout] 125 |         let mut curr_decoded: Vec<u8> = Vec::new();
[INFO] [stdout]     |                 ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `new_entry` is never read
[INFO] [stdout]    --> src/lzw.rs:126:17
[INFO] [stdout]     |
[INFO] [stdout] 126 |         let mut new_entry: Vec<u8> = Vec::new();
[INFO] [stdout]     |                 ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.61s
[INFO] running `Command { std: "docker" "inspect" "6e4eb03f204413702d0433c68c1bcdee871de8c2d919aa22874ee66829864903", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e4eb03f204413702d0433c68c1bcdee871de8c2d919aa22874ee66829864903", kill_on_drop: false }`
[INFO] [stdout] 6e4eb03f204413702d0433c68c1bcdee871de8c2d919aa22874ee66829864903