[INFO] cloning repository https://github.com/xfbs/huffman-markov
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/xfbs/huffman-markov" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxfbs%2Fhuffman-markov", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxfbs%2Fhuffman-markov'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3c1320835a549ce4346e5e5ea0b68952f671fa3d
[INFO] checking xfbs/huffman-markov against master#a932eb36f8adf6c8cdfc450f063943da3112d621 for pr-140209-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxfbs%2Fhuffman-markov" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/xfbs/huffman-markov on toolchain a932eb36f8adf6c8cdfc450f063943da3112d621
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a932eb36f8adf6c8cdfc450f063943da3112d621" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/xfbs/huffman-markov
[INFO] finished tweaking git repo https://github.com/xfbs/huffman-markov
[INFO] tweaked toml for git repo https://github.com/xfbs/huffman-markov written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/xfbs/huffman-markov 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" "+a932eb36f8adf6c8cdfc450f063943da3112d621" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+a932eb36f8adf6c8cdfc450f063943da3112d621" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8aa12a7598f28669e6bd589dad9a5cf112332f4e94dab82e163067b443d717aa
[INFO] running `Command { std: "docker" "start" "-a" "8aa12a7598f28669e6bd589dad9a5cf112332f4e94dab82e163067b443d717aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8aa12a7598f28669e6bd589dad9a5cf112332f4e94dab82e163067b443d717aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8aa12a7598f28669e6bd589dad9a5cf112332f4e94dab82e163067b443d717aa", kill_on_drop: false }`
[INFO] [stdout] 8aa12a7598f28669e6bd589dad9a5cf112332f4e94dab82e163067b443d717aa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+a932eb36f8adf6c8cdfc450f063943da3112d621" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1026bc69db02643955b95646dd6bb8bb3cac1ceb66fa5d22116a6115cd270284
[INFO] running `Command { std: "docker" "start" "-a" "1026bc69db02643955b95646dd6bb8bb3cac1ceb66fa5d22116a6115cd270284", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling proc-macro2 v1.0.78
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling rustix v0.38.31
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]     Checking bitflags v2.4.2
[INFO] [stderr]    Compiling libm v0.2.8
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]     Checking linux-raw-sys v0.4.13
[INFO] [stderr]    Compiling radium v0.7.0
[INFO] [stderr]     Checking zerocopy v0.7.32
[INFO] [stderr]    Compiling thiserror v1.0.57
[INFO] [stderr]     Checking once_cell v1.19.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]     Checking fastrand v2.0.1
[INFO] [stderr]     Checking tap v1.0.1
[INFO] [stderr]     Checking bit-vec v0.6.3
[INFO] [stderr]     Checking wyz v0.5.1
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]     Checking allocator-api2 v0.2.16
[INFO] [stderr]     Checking funty v2.0.0
[INFO] [stderr]    Compiling ahash v0.8.11
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking bit-set v0.5.3
[INFO] [stderr]     Checking regex-syntax v0.8.2
[INFO] [stderr]     Checking unarray v0.1.4
[INFO] [stderr]     Checking bitstream-io v2.2.0
[INFO] [stderr]    Compiling num-traits v0.2.18
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking bitvec v1.0.1
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]     Checking hashbrown v0.14.3
[INFO] [stderr]    Compiling syn v2.0.52
[INFO] [stderr]     Checking getrandom v0.2.12
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand_xorshift v0.3.0
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking tempfile v3.10.1
[INFO] [stderr]     Checking rusty-fork v0.3.0
[INFO] [stderr]     Checking proptest v1.4.0
[INFO] [stderr]    Compiling structmeta-derive v0.2.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.57
[INFO] [stderr]    Compiling structmeta v0.2.0
[INFO] [stderr]     Checking huffman-markov v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling test-strategy v0.3.1
[INFO] [stdout] warning: unused variable: `prefix`
[INFO] [stdout]    --> src/huffman.rs:107:23
[INFO] [stdout]     |
[INFO] [stdout] 107 |     fn decoder(&self, prefix: &[u8]) -> () {}
[INFO] [stdout]     |                       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_prefix`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `decoder` is never used
[INFO] [stdout]    --> src/huffman.rs:107:8
[INFO] [stdout]     |
[INFO] [stdout] 89  | impl Decoder {
[INFO] [stdout]     | ------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 107 |     fn decoder(&self, prefix: &[u8]) -> () {}
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/huffman.rs:161:17
[INFO] [stdout]     |
[INFO] [stdout] 161 |                 self.writer.write_bit(*bit);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 161 |                 let _ = self.writer.write_bit(*bit);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/huffman.rs:171:13
[INFO] [stdout]     |
[INFO] [stdout] 171 |             self.writer.write_bit(false);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 171 |             let _ = self.writer.write_bit(false);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `prefix`
[INFO] [stdout]    --> src/huffman.rs:107:23
[INFO] [stdout]     |
[INFO] [stdout] 107 |     fn decoder(&self, prefix: &[u8]) -> () {}
[INFO] [stdout]     |                       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_prefix`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `weight`
[INFO] [stdout]    --> src/huffman.rs:194:20
[INFO] [stdout]     |
[INFO] [stdout] 194 |         for (byte, weight) in items.iter() {
[INFO] [stdout]     |                    ^^^^^^ help: if this is intentional, prefix it with an underscore: `_weight`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `decoder` is never used
[INFO] [stdout]    --> src/huffman.rs:107:8
[INFO] [stdout]     |
[INFO] [stdout] 89  | impl Decoder {
[INFO] [stdout]     | ------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 107 |     fn decoder(&self, prefix: &[u8]) -> () {}
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/huffman.rs:161:17
[INFO] [stdout]     |
[INFO] [stdout] 161 |                 self.writer.write_bit(*bit);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 161 |                 let _ = self.writer.write_bit(*bit);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/huffman.rs:171:13
[INFO] [stdout]     |
[INFO] [stdout] 171 |             self.writer.write_bit(false);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 171 |             let _ = self.writer.write_bit(false);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.79s
[INFO] running `Command { std: "docker" "inspect" "1026bc69db02643955b95646dd6bb8bb3cac1ceb66fa5d22116a6115cd270284", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1026bc69db02643955b95646dd6bb8bb3cac1ceb66fa5d22116a6115cd270284", kill_on_drop: false }`
[INFO] [stdout] 1026bc69db02643955b95646dd6bb8bb3cac1ceb66fa5d22116a6115cd270284