[INFO] cloning repository https://github.com/LegendarySaiyan/structures
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/LegendarySaiyan/structures" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLegendarySaiyan%2Fstructures", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLegendarySaiyan%2Fstructures'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f375d1f242c501951f7a3a6c49a09a7895f57326
[INFO] building LegendarySaiyan/structures against try#b83b707f97d809763b7861afa7638871f3339a33 for pr-145838-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLegendarySaiyan%2Fstructures" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/LegendarySaiyan/structures
[INFO] finished tweaking git repo https://github.com/LegendarySaiyan/structures
[INFO] tweaked toml for git repo https://github.com/LegendarySaiyan/structures written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/LegendarySaiyan/structures on toolchain b83b707f97d809763b7861afa7638871f3339a33
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/LegendarySaiyan/structures 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" "+b83b707f97d809763b7861afa7638871f3339a33" "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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a9ce0687148ebdd312bbcc1d91ff6c6933f8d4ba8a2b5530eae3c94f50994121
[INFO] running `Command { std: "docker" "start" "-a" "a9ce0687148ebdd312bbcc1d91ff6c6933f8d4ba8a2b5530eae3c94f50994121", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a9ce0687148ebdd312bbcc1d91ff6c6933f8d4ba8a2b5530eae3c94f50994121", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9ce0687148ebdd312bbcc1d91ff6c6933f8d4ba8a2b5530eae3c94f50994121", kill_on_drop: false }`
[INFO] [stdout] a9ce0687148ebdd312bbcc1d91ff6c6933f8d4ba8a2b5530eae3c94f50994121
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3f40838552f3ee380c477c0e9d6de795476c21c30ca0492f2ce880f9f8152662
[INFO] running `Command { std: "docker" "start" "-a" "3f40838552f3ee380c477c0e9d6de795476c21c30ca0492f2ce880f9f8152662", kill_on_drop: false }`
[INFO] [stderr]    Compiling structures v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `left` is never read
[INFO] [stdout]    --> src/binary_tree.rs:272:17
[INFO] [stdout]     |
[INFO] [stdout] 272 |         let mut left = std::option::Option::None;
[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: value assigned to `right` is never read
[INFO] [stdout]    --> src/binary_tree.rs:273:17
[INFO] [stdout]     |
[INFO] [stdout] 273 |         let mut right = std::option::Option::None;
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `parent` is never read
[INFO] [stdout]    --> src/binary_tree.rs:274:17
[INFO] [stdout]     |
[INFO] [stdout] 274 |         let mut parent = std::option::Option::None;
[INFO] [stdout]     |                 ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]    --> src/red_black_tree.rs:343:17
[INFO] [stdout]     |
[INFO] [stdout] 343 |         let mut x = None;
[INFO] [stdout]     |                 ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/red_black_tree.rs:396:13
[INFO] [stdout]     |
[INFO] [stdout] 396 |         let mut x_ptr = x.unwrap().as_ptr();
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.24s
[INFO] running `Command { std: "docker" "inspect" "3f40838552f3ee380c477c0e9d6de795476c21c30ca0492f2ce880f9f8152662", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f40838552f3ee380c477c0e9d6de795476c21c30ca0492f2ce880f9f8152662", kill_on_drop: false }`
[INFO] [stdout] 3f40838552f3ee380c477c0e9d6de795476c21c30ca0492f2ce880f9f8152662
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bccaf20a31f597ba951bd5020f97508b0bd5c50dcf30276e39378e305dfb06b7
[INFO] running `Command { std: "docker" "start" "-a" "bccaf20a31f597ba951bd5020f97508b0bd5c50dcf30276e39378e305dfb06b7", kill_on_drop: false }`
[INFO] [stdout] warning: value assigned to `left` is never read
[INFO] [stdout]    --> src/binary_tree.rs:272:17
[INFO] [stdout]     |
[INFO] [stdout] 272 |         let mut left = std::option::Option::None;
[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: value assigned to `right` is never read
[INFO] [stdout]    --> src/binary_tree.rs:273:17
[INFO] [stdout]     |
[INFO] [stdout] 273 |         let mut right = std::option::Option::None;
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `parent` is never read
[INFO] [stdout]    --> src/binary_tree.rs:274:17
[INFO] [stdout]     |
[INFO] [stdout] 274 |         let mut parent = std::option::Option::None;
[INFO] [stdout]     |                 ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]    --> src/red_black_tree.rs:343:17
[INFO] [stdout]     |
[INFO] [stdout] 343 |         let mut x = None;
[INFO] [stdout]     |                 ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/red_black_tree.rs:396:13
[INFO] [stdout]     |
[INFO] [stdout] 396 |         let mut x_ptr = x.unwrap().as_ptr();
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling structures v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `left` is never read
[INFO] [stdout]    --> src/binary_tree.rs:272:17
[INFO] [stdout]     |
[INFO] [stdout] 272 |         let mut left = std::option::Option::None;
[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: value assigned to `right` is never read
[INFO] [stdout]    --> src/binary_tree.rs:273:17
[INFO] [stdout]     |
[INFO] [stdout] 273 |         let mut right = std::option::Option::None;
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `parent` is never read
[INFO] [stdout]    --> src/binary_tree.rs:274:17
[INFO] [stdout]     |
[INFO] [stdout] 274 |         let mut parent = std::option::Option::None;
[INFO] [stdout]     |                 ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]    --> src/red_black_tree.rs:343:17
[INFO] [stdout]     |
[INFO] [stdout] 343 |         let mut x = None;
[INFO] [stdout]     |                 ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/red_black_tree.rs:396:13
[INFO] [stdout]     |
[INFO] [stdout] 396 |         let mut x_ptr = x.unwrap().as_ptr();
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.40s
[INFO] running `Command { std: "docker" "inspect" "bccaf20a31f597ba951bd5020f97508b0bd5c50dcf30276e39378e305dfb06b7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bccaf20a31f597ba951bd5020f97508b0bd5c50dcf30276e39378e305dfb06b7", kill_on_drop: false }`
[INFO] [stdout] bccaf20a31f597ba951bd5020f97508b0bd5c50dcf30276e39378e305dfb06b7