[INFO] updating cached repository sergorl/merkle_hash_tree
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/sergorl/merkle_hash_tree
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/sergorl/merkle_hash_tree" "work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/sergorl/merkle_hash_tree"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/sergorl/merkle_hash_tree'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/sergorl/merkle_hash_tree" "work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/sergorl/merkle_hash_tree"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/sergorl/merkle_hash_tree'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 27429dcf39c550bb473f4c7907ca5c3de4e5aacf
[INFO] sha for GitHub repo sergorl/merkle_hash_tree: 27429dcf39c550bb473f4c7907ca5c3de4e5aacf
[INFO] validating manifest of sergorl/merkle_hash_tree on toolchain master#a850a426491e14186af2250549bf41256b5938d2
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of sergorl/merkle_hash_tree on toolchain try#06a150c7d11500b41499224f165e9de1de096768
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing sergorl/merkle_hash_tree
[INFO] finished frobbing sergorl/merkle_hash_tree
[INFO] frobbed toml for sergorl/merkle_hash_tree written to work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/sergorl/merkle_hash_tree/Cargo.toml
[INFO] started frobbing sergorl/merkle_hash_tree
[INFO] finished frobbing sergorl/merkle_hash_tree
[INFO] frobbed toml for sergorl/merkle_hash_tree written to work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/sergorl/merkle_hash_tree/Cargo.toml
[INFO] crate sergorl/merkle_hash_tree already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking sergorl/merkle_hash_tree against master#a850a426491e14186af2250549bf41256b5938d2 for pr-60162
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60162/worker-4/master#a850a426491e14186af2250549bf41256b5938d2:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/sergorl/merkle_hash_tree:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 23403d26d4cf1fbfb8de25694639398808301c517e152a89ea341df32642dd20
[INFO] running `"docker" "start" "-a" "23403d26d4cf1fbfb8de25694639398808301c517e152a89ea341df32642dd20"`
[INFO] [stderr]     Checking num_cpus v0.2.13
[INFO] [stderr]     Checking rust-crypto v0.2.36
[INFO] [stderr]     Checking rayon v0.9.0
[INFO] [stderr]     Checking merkle_hash_tree v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `num_thread`
[INFO] [stderr]    --> src/lib.rs:272:13
[INFO] [stderr]     |
[INFO] [stderr] 272 |         let num_thread: usize;
[INFO] [stderr]     |             ^^^^^^^^^^ help: consider prefixing with an underscore: `_num_thread`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_cpus`
[INFO] [stderr]    --> src/lib.rs:255:78
[INFO] [stderr]     |
[INFO] [stderr] 255 | fn create_hash_level(hash_tree: &mut Vec<Vec<u8>>, pool: &rayon::ThreadPool, num_cpus: usize) {
[INFO] [stderr]     |                                                                              ^^^^^^^^ help: consider prefixing with an underscore: `_num_cpus`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_cpus`
[INFO] [stderr]    --> src/lib.rs:305:5
[INFO] [stderr]     |
[INFO] [stderr] 305 |     num_cpus: usize,
[INFO] [stderr]     |     ^^^^^^^^ help: consider prefixing with an underscore: `_num_cpus`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_thread`
[INFO] [stderr]    --> src/lib.rs:272:13
[INFO] [stderr]     |
[INFO] [stderr] 272 |         let num_thread: usize;
[INFO] [stderr]     |             ^^^^^^^^^^ help: consider prefixing with an underscore: `_num_thread`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_cpus`
[INFO] [stderr]    --> src/lib.rs:255:78
[INFO] [stderr]     |
[INFO] [stderr] 255 | fn create_hash_level(hash_tree: &mut Vec<Vec<u8>>, pool: &rayon::ThreadPool, num_cpus: usize) {
[INFO] [stderr]     |                                                                              ^^^^^^^^ help: consider prefixing with an underscore: `_num_cpus`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_cpus`
[INFO] [stderr]    --> src/lib.rs:305:5
[INFO] [stderr]     |
[INFO] [stderr] 305 |     num_cpus: usize,
[INFO] [stderr]     |     ^^^^^^^^ help: consider prefixing with an underscore: `_num_cpus`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:158:9
[INFO] [stderr]     |
[INFO] [stderr] 158 |         write!(f, "{}\n", "Tree: ");
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:161:13
[INFO] [stderr]     |
[INFO] [stderr] 161 |             write!(f, "Level {}: \n", level);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:164:17
[INFO] [stderr]     |
[INFO] [stderr] 164 |                 write!(f, "hash {}: {}\n", index, to_hex_string(hash));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:170:13
[INFO] [stderr]     |
[INFO] [stderr] 170 | /             write!(
[INFO] [stderr] 171 | |                 f,
[INFO] [stderr] 172 | |                 "{}\n",
[INFO] [stderr] 173 | |                 "--------------------------------------------------------------------"
[INFO] [stderr] 174 | |             );
[INFO] [stderr]     | |______________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:158:9
[INFO] [stderr]     |
[INFO] [stderr] 158 |         write!(f, "{}\n", "Tree: ");
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:161:13
[INFO] [stderr]     |
[INFO] [stderr] 161 |             write!(f, "Level {}: \n", level);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:164:17
[INFO] [stderr]     |
[INFO] [stderr] 164 |                 write!(f, "hash {}: {}\n", index, to_hex_string(hash));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:170:13
[INFO] [stderr]     |
[INFO] [stderr] 170 | /             write!(
[INFO] [stderr] 171 | |                 f,
[INFO] [stderr] 172 | |                 "{}\n",
[INFO] [stderr] 173 | |                 "--------------------------------------------------------------------"
[INFO] [stderr] 174 | |             );
[INFO] [stderr]     | |______________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `merkle_tree::to_hex_string`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use merkle_tree::to_hex_string;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rand::Rng`
[INFO] [stderr]  --> benches/bench.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use rand::Rng;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crypto::digest::Digest`
[INFO] [stderr]   --> tests/test.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use crypto::digest::Digest;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rand::Rng`
[INFO] [stderr]   --> tests/test.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 | use rand::Rng;
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `merkle_tree::to_hex_string`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use merkle_tree::to_hex_string;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `start`
[INFO] [stderr]   --> src/main.rs:23:9
[INFO] [stderr]    |
[INFO] [stderr] 23 |     let start = PreciseTime::now();
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_start`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `end`
[INFO] [stderr]   --> src/main.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 |     let end = PreciseTime::now();
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_end`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let mut num_block: usize = 8 * 2;
[INFO] [stderr]    |         ----^^^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |     let mut size_block: usize = 32;
[INFO] [stderr]    |         ----^^^^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `start`
[INFO] [stderr]   --> src/main.rs:23:9
[INFO] [stderr]    |
[INFO] [stderr] 23 |     let start = PreciseTime::now();
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_start`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `end`
[INFO] [stderr]   --> src/main.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 |     let end = PreciseTime::now();
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_end`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let mut num_block: usize = 8 * 2;
[INFO] [stderr]    |         ----^^^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |     let mut size_block: usize = 32;
[INFO] [stderr]    |         ----^^^^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `tree`
[INFO] [stderr]   --> tests/test.rs:66:13
[INFO] [stderr]    |
[INFO] [stderr] 66 |         let tree = MerkleTree::new(&data, num_cpus::get());
[INFO] [stderr]    |             ^^^^ help: consider prefixing with an underscore: `_tree`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `tree`
[INFO] [stderr]   --> tests/test.rs:74:13
[INFO] [stderr]    |
[INFO] [stderr] 74 |         let tree = MerkleTree::new(&data, num_cpus::get());
[INFO] [stderr]    |             ^^^^ help: consider prefixing with an underscore: `_tree`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `tree`
[INFO] [stderr]   --> tests/test.rs:82:13
[INFO] [stderr]    |
[INFO] [stderr] 82 |         let tree = MerkleTree::new(&data, num_cpus::get());
[INFO] [stderr]    |             ^^^^ help: consider prefixing with an underscore: `_tree`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.54s
[INFO] running `"docker" "inspect" "23403d26d4cf1fbfb8de25694639398808301c517e152a89ea341df32642dd20"`
[INFO] running `"docker" "rm" "-f" "23403d26d4cf1fbfb8de25694639398808301c517e152a89ea341df32642dd20"`
[INFO] [stdout] 23403d26d4cf1fbfb8de25694639398808301c517e152a89ea341df32642dd20