[INFO] fetching crate metaheuristics 1.0.15...
[INFO] checking metaheuristics-1.0.15 against try#ddfd70ee3c3748e597b32f416b0d15a4f6e37685 for pr-87050
[INFO] extracting crate metaheuristics 1.0.15 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate metaheuristics 1.0.15 on toolchain ddfd70ee3c3748e597b32f416b0d15a4f6e37685
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate metaheuristics 1.0.15
[INFO] finished tweaking crates.io crate metaheuristics 1.0.15
[INFO] tweaked toml for crates.io crate metaheuristics 1.0.15 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "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-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c8f22b960656bf07b1a22edf4beb228022b900e9118eba9c1d37cb242fc2ced7
[INFO] running `Command { std: "docker" "start" "-a" "c8f22b960656bf07b1a22edf4beb228022b900e9118eba9c1d37cb242fc2ced7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c8f22b960656bf07b1a22edf4beb228022b900e9118eba9c1d37cb242fc2ced7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c8f22b960656bf07b1a22edf4beb228022b900e9118eba9c1d37cb242fc2ced7", kill_on_drop: false }`
[INFO] [stdout] c8f22b960656bf07b1a22edf4beb228022b900e9118eba9c1d37cb242fc2ced7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7b15c492608f3be8eaf3ce3b0fe4f908d174a387de3215cc137f311eece69cad
[INFO] running `Command { std: "docker" "start" "-a" "7b15c492608f3be8eaf3ce3b0fe4f908d174a387de3215cc137f311eece69cad", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.98
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking metaheuristics v1.0.15 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/hill_climbing/random_restarts/mod.rs:44:31
[INFO] [stdout]    |
[INFO] [stdout] 44 | pub fn solve<T>(problem: &mut Metaheuristics<T>, runtime: Duration, probability: f64) -> T {
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Metaheuristics<T>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/hill_climbing/mod.rs:39:31
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub fn solve<T>(problem: &mut Metaheuristics<T>, runtime: Duration) -> T {
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Metaheuristics<T>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/random_search/mod.rs:30:31
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn solve<T>(problem: &mut Metaheuristics<T>, runtime: Duration) -> T {
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Metaheuristics<T>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/simulated_annealing/mod.rs:64:31
[INFO] [stdout]    |
[INFO] [stdout] 64 | pub fn solve<T>(problem: &mut Metaheuristics<T>, runtime: Duration) -> T {
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Metaheuristics<T>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/hill_climbing/random_restarts/mod.rs:44:31
[INFO] [stdout]    |
[INFO] [stdout] 44 | pub fn solve<T>(problem: &mut Metaheuristics<T>, runtime: Duration, probability: f64) -> T {
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Metaheuristics<T>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/hill_climbing/mod.rs:39:31
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub fn solve<T>(problem: &mut Metaheuristics<T>, runtime: Duration) -> T {
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Metaheuristics<T>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/random_search/mod.rs:30:31
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn solve<T>(problem: &mut Metaheuristics<T>, runtime: Duration) -> T {
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Metaheuristics<T>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/simulated_annealing/mod.rs:64:31
[INFO] [stdout]    |
[INFO] [stdout] 64 | pub fn solve<T>(problem: &mut Metaheuristics<T>, runtime: Duration) -> T {
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Metaheuristics<T>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.53s
[INFO] running `Command { std: "docker" "inspect" "7b15c492608f3be8eaf3ce3b0fe4f908d174a387de3215cc137f311eece69cad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b15c492608f3be8eaf3ce3b0fe4f908d174a387de3215cc137f311eece69cad", kill_on_drop: false }`
[INFO] [stdout] 7b15c492608f3be8eaf3ce3b0fe4f908d174a387de3215cc137f311eece69cad