[INFO] fetching crate shortcut 4.1.4...
[INFO] checking shortcut-4.1.4 against 1.55.0 for beta-1.56-3
[INFO] extracting crate shortcut 4.1.4 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate shortcut 4.1.4 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate shortcut 4.1.4
[INFO] finished tweaking crates.io crate shortcut 4.1.4
[INFO] tweaked toml for crates.io crate shortcut 4.1.4 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "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] 8e7939a2791f0b5632af909b6f416b7e0695118888241696d0b3978458b69845
[INFO] running `Command { std: "docker" "start" "-a" "8e7939a2791f0b5632af909b6f416b7e0695118888241696d0b3978458b69845", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8e7939a2791f0b5632af909b6f416b7e0695118888241696d0b3978458b69845", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e7939a2791f0b5632af909b6f416b7e0695118888241696d0b3978458b69845", kill_on_drop: false }`
[INFO] [stdout] 8e7939a2791f0b5632af909b6f416b7e0695118888241696d0b3978458b69845
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", 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] 2a7a4014f747790af355ab25931a1629ca42e7c7dbf4ccb2b673056418842cef
[INFO] running `Command { std: "docker" "start" "-a" "2a7a4014f747790af355ab25931a1629ca42e7c7dbf4ccb2b673056418842cef", kill_on_drop: false }`
[INFO] [stderr]     Checking shortcut v4.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/idx.rs:10:29
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn lookup<'a>(&'a self, &T) -> Box<Iterator<Item = usize> + 'a>;
[INFO] [stdout]    |                             ^^ help: try naming the parameter or explicitly ignoring it: `_: &T`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/idx.rs:10:40
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn lookup<'a>(&'a self, &T) -> Box<Iterator<Item = usize> + 'a>;
[INFO] [stdout]    |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = usize> + 'a`
[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: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/idx.rs:10:29
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn lookup<'a>(&'a self, &T) -> Box<Iterator<Item = usize> + 'a>;
[INFO] [stdout]    |                             ^^ help: try naming the parameter or explicitly ignoring it: `_: &T`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/idx.rs:10:40
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn lookup<'a>(&'a self, &T) -> Box<Iterator<Item = usize> + 'a>;
[INFO] [stdout]    |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = usize> + 'a`
[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: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/idx.rs:13:25
[INFO] [stdout]    |
[INFO] [stdout] 13 |     fn index(&mut self, T, usize);
[INFO] [stdout]    |                         ^ help: try naming the parameter or explicitly ignoring it: `_: T`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/idx.rs:13:28
[INFO] [stdout]    |
[INFO] [stdout] 13 |     fn index(&mut self, T, usize);
[INFO] [stdout]    |                            ^^^^^ help: try naming the parameter or explicitly ignoring it: `_: usize`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/idx.rs:16:25
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn undex(&mut self, &T, usize);
[INFO] [stdout]    |                         ^^ help: try naming the parameter or explicitly ignoring it: `_: &T`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/idx.rs:16:29
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn undex(&mut self, &T, usize);
[INFO] [stdout]    |                             ^^^^^ help: try naming the parameter or explicitly ignoring it: `_: usize`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/idx.rs:41:45
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn lookup<'a>(&'a self, key: &T) -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout]    |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = usize> + 'a`
[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: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/idx.rs:13:25
[INFO] [stdout]    |
[INFO] [stdout] 13 |     fn index(&mut self, T, usize);
[INFO] [stdout]    |                         ^ help: try naming the parameter or explicitly ignoring it: `_: T`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/idx.rs:86:30
[INFO] [stdout]    |
[INFO] [stdout] 86 |     fn between<'a>(&'a self, Bound<&T>, Bound<&T>) -> Box<Iterator<Item = usize> + 'a>;
[INFO] [stdout]    |                              ^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: Bound<&T>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/idx.rs:13:28
[INFO] [stdout]    |
[INFO] [stdout] 13 |     fn index(&mut self, T, usize);
[INFO] [stdout]    |                            ^^^^^ help: try naming the parameter or explicitly ignoring it: `_: usize`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/idx.rs:86:41
[INFO] [stdout]    |
[INFO] [stdout] 86 |     fn between<'a>(&'a self, Bound<&T>, Bound<&T>) -> Box<Iterator<Item = usize> + 'a>;
[INFO] [stdout]    |                                         ^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: Bound<&T>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/idx.rs:16:25
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn undex(&mut self, &T, usize);
[INFO] [stdout]    |                         ^^ help: try naming the parameter or explicitly ignoring it: `_: &T`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/idx.rs:86:59
[INFO] [stdout]    |
[INFO] [stdout] 86 |     fn between<'a>(&'a self, Bound<&T>, Bound<&T>) -> Box<Iterator<Item = usize> + 'a>;
[INFO] [stdout]    |                                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = usize> + 'a`
[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: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/idx.rs:16:29
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn undex(&mut self, &T, usize);
[INFO] [stdout]    |                             ^^^^^ help: try naming the parameter or explicitly ignoring it: `_: usize`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/idx.rs:107:45
[INFO] [stdout]     |
[INFO] [stdout] 107 |     fn lookup<'a>(&'a self, key: &T) -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = usize> + 'a`
[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/idx.rs:41:45
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn lookup<'a>(&'a self, key: &T) -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout]    |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = usize> + 'a`
[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/idx.rs:132:69
[INFO] [stdout]     |
[INFO] [stdout] 132 |     fn between<'a>(&'a self, min: Bound<&T>, max: Bound<&T>) -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout]     |                                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = usize> + 'a`
[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: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/idx.rs:86:30
[INFO] [stdout]    |
[INFO] [stdout] 86 |     fn between<'a>(&'a self, Bound<&T>, Bound<&T>) -> Box<Iterator<Item = usize> + 'a>;
[INFO] [stdout]    |                              ^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: Bound<&T>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/idx.rs:142:15
[INFO] [stdout]     |
[INFO] [stdout] 142 |     Range(Box<RangeIndex<T> + Send + Sync>),
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn RangeIndex<T> + Send + Sync`
[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: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/idx.rs:86:41
[INFO] [stdout]    |
[INFO] [stdout] 86 |     fn between<'a>(&'a self, Bound<&T>, Bound<&T>) -> Box<Iterator<Item = usize> + 'a>;
[INFO] [stdout]    |                                         ^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: Bound<&T>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/idx.rs:144:18
[INFO] [stdout]     |
[INFO] [stdout] 144 |     Equality(Box<EqualityIndex<T> + Send + Sync>),
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn EqualityIndex<T> + Send + Sync`
[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/idx.rs:86:59
[INFO] [stdout]    |
[INFO] [stdout] 86 |     fn between<'a>(&'a self, Bound<&T>, Bound<&T>) -> Box<Iterator<Item = usize> + 'a>;
[INFO] [stdout]    |                                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = usize> + 'a`
[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/idx.rs:148:45
[INFO] [stdout]     |
[INFO] [stdout] 148 |     fn lookup<'a>(&'a self, key: &T) -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = usize> + 'a`
[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/lib.rs:100:39
[INFO] [stdout]     |
[INFO] [stdout] 100 | ...                   -> Box<Iterator<Item = usize> + 's> {
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = usize> + 's`
[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/idx.rs:107:45
[INFO] [stdout]     |
[INFO] [stdout] 107 |     fn lookup<'a>(&'a self, key: &T) -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = usize> + 'a`
[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: the item `EqualityIndex` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:102:13
[INFO] [stdout]     |
[INFO] [stdout] 42  | pub use idx::EqualityIndex;
[INFO] [stdout]     |         ------------------ the item `EqualityIndex` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 102 |         use EqualityIndex;
[INFO] [stdout]     |             ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/idx.rs:132:69
[INFO] [stdout]     |
[INFO] [stdout] 132 |     fn between<'a>(&'a self, min: Bound<&T>, max: Bound<&T>) -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout]     |                                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = usize> + 'a`
[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/lib.rs:132:36
[INFO] [stdout]     |
[INFO] [stdout] 132 | ...                   -> Box<Iterator<Item = &'s R> + 'c> {
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &'s R> + 'c`
[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: the item `EqualityIndex` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:182:17
[INFO] [stdout]     |
[INFO] [stdout] 42  | pub use idx::EqualityIndex;
[INFO] [stdout]     |         ------------------ the item `EqualityIndex` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 182 |             use EqualityIndex;
[INFO] [stdout]     |                 ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `EqualityIndex` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:196:13
[INFO] [stdout]     |
[INFO] [stdout] 42  | pub use idx::EqualityIndex;
[INFO] [stdout]     |         ------------------ the item `EqualityIndex` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 196 |         use EqualityIndex;
[INFO] [stdout]     |             ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/idx.rs:142:15
[INFO] [stdout]     |
[INFO] [stdout] 142 |     Range(Box<RangeIndex<T> + Send + Sync>),
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn RangeIndex<T> + Send + Sync`
[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/idx.rs:144:18
[INFO] [stdout]     |
[INFO] [stdout] 144 |     Equality(Box<EqualityIndex<T> + Send + Sync>),
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn EqualityIndex<T> + Send + Sync`
[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/idx.rs:148:45
[INFO] [stdout]     |
[INFO] [stdout] 148 |     fn lookup<'a>(&'a self, key: &T) -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = usize> + 'a`
[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/lib.rs:100:39
[INFO] [stdout]     |
[INFO] [stdout] 100 | ...                   -> Box<Iterator<Item = usize> + 's> {
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = usize> + 's`
[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: the item `EqualityIndex` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:102:13
[INFO] [stdout]     |
[INFO] [stdout] 42  | pub use idx::EqualityIndex;
[INFO] [stdout]     |         ------------------ the item `EqualityIndex` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 102 |         use EqualityIndex;
[INFO] [stdout]     |             ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:132:36
[INFO] [stdout]     |
[INFO] [stdout] 132 | ...                   -> Box<Iterator<Item = &'s R> + 'c> {
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &'s R> + 'c`
[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: the item `EqualityIndex` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:182:17
[INFO] [stdout]     |
[INFO] [stdout] 42  | pub use idx::EqualityIndex;
[INFO] [stdout]     |         ------------------ the item `EqualityIndex` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 182 |             use EqualityIndex;
[INFO] [stdout]     |                 ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `EqualityIndex` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:196:13
[INFO] [stdout]     |
[INFO] [stdout] 42  | pub use idx::EqualityIndex;
[INFO] [stdout]     |         ------------------ the item `EqualityIndex` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 196 |         use EqualityIndex;
[INFO] [stdout]     |             ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/idx.rs:55:21
[INFO] [stdout]    |
[INFO] [stdout] 55 |         if let Some(mut l) = self.map.get_mut(key) {
[INFO] [stdout]    |                     ----^
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 21 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/idx.rs:55:21
[INFO] [stdout]    |
[INFO] [stdout] 55 |         if let Some(mut l) = self.map.get_mut(key) {
[INFO] [stdout]    |                     ----^
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 21 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> benches/bench.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> benches/bench.rs:62:59
[INFO] [stdout]    |
[INFO] [stdout] 62 |             cmp: cmp::Comparison::Equal(cmp::Value::Const(format!("{}", i))),
[INFO] [stdout]    |                                                           ^^^^^^^^^^^^^^^^ expected enum `Cow`, found struct `String`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected enum `Cow<'_, _>`
[INFO] [stdout]             found struct `String`
[INFO] [stdout]    = note: this error originates in the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `shortcut` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "2a7a4014f747790af355ab25931a1629ca42e7c7dbf4ccb2b673056418842cef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a7a4014f747790af355ab25931a1629ca42e7c7dbf4ccb2b673056418842cef", kill_on_drop: false }`
[INFO] [stdout] 2a7a4014f747790af355ab25931a1629ca42e7c7dbf4ccb2b673056418842cef
