[INFO] updating cached repository https://github.com/mpdrescher/huffman-compression
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f7270fd9505444ab81fa668aac53c656adf94f96
[INFO] checking mpdrescher/huffman-compression against master#1557fb031b272b4c5bfcc7de5df7eddc7b36a584 for pr-73166
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmpdrescher%2Fhuffman-compression" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mpdrescher/huffman-compression on toolchain 1557fb031b272b4c5bfcc7de5df7eddc7b36a584
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mpdrescher/huffman-compression
[INFO] finished tweaking git repo https://github.com/mpdrescher/huffman-compression
[INFO] tweaked toml for git repo https://github.com/mpdrescher/huffman-compression written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/mpdrescher/huffman-compression already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 80cee327d301100a7a78eb188dcd3ade8a01181d3c03f8ed4db3f3d2c94ddaef
[INFO] running `Command { std: "docker" "start" "-a" "80cee327d301100a7a78eb188dcd3ade8a01181d3c03f8ed4db3f3d2c94ddaef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "80cee327d301100a7a78eb188dcd3ade8a01181d3c03f8ed4db3f3d2c94ddaef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "80cee327d301100a7a78eb188dcd3ade8a01181d3c03f8ed4db3f3d2c94ddaef", kill_on_drop: false }`
[INFO] [stdout] 80cee327d301100a7a78eb188dcd3ade8a01181d3c03f8ed4db3f3d2c94ddaef
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4cee224a27ee3022d9dfb9a8ffe72ca89f14f83af24d58fb0ba3dd82fa0c0f32
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4cee224a27ee3022d9dfb9a8ffe72ca89f14f83af24d58fb0ba3dd82fa0c0f32", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking huffman v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/main.rs:105:17
[INFO] [stdout]     |
[INFO] [stdout] 105 |     let mut file = try!(File::create(get_compressed_file_name(filepath)));
[INFO] [stdout]     |                    ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/main.rs:106:2
[INFO] [stdout]     |
[INFO] [stdout] 106 |     try!(file.write_all(content.as_slice()));
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/main.rs:112:17
[INFO] [stdout]     |
[INFO] [stdout] 112 |     let mut file = try!(File::create(filepath));
[INFO] [stdout]     |                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/main.rs:113:2
[INFO] [stdout]     |
[INFO] [stdout] 113 |     try!(file.write_all(data.as_slice()));
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/main.rs:105:17
[INFO] [stdout]     |
[INFO] [stdout] 105 |     let mut file = try!(File::create(get_compressed_file_name(filepath)));
[INFO] [stdout]     |                    ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/main.rs:106:2
[INFO] [stdout]     |
[INFO] [stdout] 106 |     try!(file.write_all(content.as_slice()));
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/main.rs:112:17
[INFO] [stdout]     |
[INFO] [stdout] 112 |     let mut file = try!(File::create(filepath));
[INFO] [stdout]     |                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/main.rs:113:2
[INFO] [stdout]     |
[INFO] [stdout] 113 |     try!(file.write_all(data.as_slice()));
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/compression.rs:25:41
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub fn decompress(data: Data) -> Option<(Data)>//Option<Data>
[INFO] [stdout]    |                                         ^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/compression.rs:25:41
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub fn decompress(data: Data) -> Option<(Data)>//Option<Data>
[INFO] [stdout]    |                                         ^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `cur_byte` is never read
[INFO] [stdout]    --> src/huffmantree.rs:188:7
[INFO] [stdout]     |
[INFO] [stdout] 188 |         let mut cur_byte: u8 = 4;
[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 `cur_byte` is never read
[INFO] [stdout]    --> src/huffmantree.rs:188:7
[INFO] [stdout]     |
[INFO] [stdout] 188 |         let mut cur_byte: u8 = 4;
[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: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.56s
[INFO] running `Command { std: "docker" "inspect" "4cee224a27ee3022d9dfb9a8ffe72ca89f14f83af24d58fb0ba3dd82fa0c0f32", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4cee224a27ee3022d9dfb9a8ffe72ca89f14f83af24d58fb0ba3dd82fa0c0f32", kill_on_drop: false }`
[INFO] [stdout] 4cee224a27ee3022d9dfb9a8ffe72ca89f14f83af24d58fb0ba3dd82fa0c0f32