[INFO] crate openml 0.1.2 is already in cache
[INFO] extracting crate openml 0.1.2 into work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/reg/openml/0.1.2
[INFO] extracting crate openml 0.1.2 into work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/reg/openml/0.1.2
[INFO] validating manifest of openml-0.1.2 on toolchain master#452087b4bf18cece2d52d7cd8c9147195e5404bf
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of openml-0.1.2 on toolchain try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing openml-0.1.2
[INFO] finished frobbing openml-0.1.2
[INFO] frobbed toml for openml-0.1.2 written to work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/reg/openml/0.1.2/Cargo.toml
[INFO] started frobbing openml-0.1.2
[INFO] finished frobbing openml-0.1.2
[INFO] frobbed toml for openml-0.1.2 written to work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/reg/openml/0.1.2/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking openml-0.1.2 against try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab for pr-63247
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63247/worker-0/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/reg/openml/0.1.2:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/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" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 635aff5ad84eacaaa9131ce77842d26c389ef31f0a6192e2b18601a96fe5d3a0
[INFO] running `"docker" "start" "-a" "635aff5ad84eacaaa9131ce77842d26c389ef31f0a6192e2b18601a96fe5d3a0"`
[INFO] [stderr]     Checking arff v0.3.0
[INFO] [stderr]     Checking openml v0.1.2 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/procedures/frozen_sets.rs:10:34
[INFO] [stderr]    |
[INFO] [stderr] 10 |     fn iter<'a>(&'a self) -> Box<'a + Iterator<Item = &'a Fold>> {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn 'a + Iterator<Item = &'a Fold>`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/procedures/mod.rs:9:34
[INFO] [stderr]   |
[INFO] [stderr] 9 |     fn iter<'a>(&'a self) -> Box<'a + Iterator<Item = &'a Fold>>;
[INFO] [stderr]   |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn 'a + Iterator<Item = &'a Fold>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_classification.rs:13:42
[INFO] [stderr]    |
[INFO] [stderr] 13 |     pub(crate) estimation_procedure: Box<Procedure>,
[INFO] [stderr]    |                                          ^^^^^^^^^ help: use `dyn`: `dyn Procedure`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_classification.rs:33:20
[INFO] [stderr]    |
[INFO] [stderr] 33 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&X, &Y)>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_classification.rs:33:52
[INFO] [stderr]    |
[INFO] [stderr] 33 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                                                    ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &X>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_classification.rs:33:80
[INFO] [stderr]    |
[INFO] [stderr] 33 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                                                                                ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = Y>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_classification.rs:66:20
[INFO] [stderr]    |
[INFO] [stderr] 66 |         F: Fn(&mut Iterator<Item = (&[X], &Y)>, &mut Iterator<Item = &[X]>)
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&[X], &Y)>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_classification.rs:66:54
[INFO] [stderr]    |
[INFO] [stderr] 66 |         F: Fn(&mut Iterator<Item = (&[X], &Y)>, &mut Iterator<Item = &[X]>)
[INFO] [stderr]    |                                                      ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &[X]>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_classification.rs:67:20
[INFO] [stderr]    |
[INFO] [stderr] 67 |             -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = Y>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_regression.rs:13:42
[INFO] [stderr]    |
[INFO] [stderr] 13 |     pub(crate) estimation_procedure: Box<Procedure>,
[INFO] [stderr]    |                                          ^^^^^^^^^ help: use `dyn`: `dyn Procedure`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_regression.rs:32:20
[INFO] [stderr]    |
[INFO] [stderr] 32 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&X, &Y)>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_regression.rs:32:52
[INFO] [stderr]    |
[INFO] [stderr] 32 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                                                    ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &X>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_regression.rs:32:80
[INFO] [stderr]    |
[INFO] [stderr] 32 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                                                                                ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = Y>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_regression.rs:65:20
[INFO] [stderr]    |
[INFO] [stderr] 65 |         F: Fn(&mut Iterator<Item = (&[X], &Y)>, &mut Iterator<Item = &[X]>)
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&[X], &Y)>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_regression.rs:65:54
[INFO] [stderr]    |
[INFO] [stderr] 65 |         F: Fn(&mut Iterator<Item = (&[X], &Y)>, &mut Iterator<Item = &[X]>)
[INFO] [stderr]    |                                                      ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &[X]>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_regression.rs:66:20
[INFO] [stderr]    |
[INFO] [stderr] 66 |             -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = Y>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/mod.rs:25:20
[INFO] [stderr]    |
[INFO] [stderr] 25 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&X, &Y)>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/mod.rs:25:52
[INFO] [stderr]    |
[INFO] [stderr] 25 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                                                    ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &X>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/mod.rs:25:80
[INFO] [stderr]    |
[INFO] [stderr] 25 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                                                                                ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = Y>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/mod.rs:34:20
[INFO] [stderr]    |
[INFO] [stderr] 34 |         F: Fn(&mut Iterator<Item = (&[X], &Y)>, &mut Iterator<Item = &[X]>)
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&[X], &Y)>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/mod.rs:34:54
[INFO] [stderr]    |
[INFO] [stderr] 34 |         F: Fn(&mut Iterator<Item = (&[X], &Y)>, &mut Iterator<Item = &[X]>)
[INFO] [stderr]    |                                                      ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &[X]>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/mod.rs:35:20
[INFO] [stderr]    |
[INFO] [stderr] 35 |             -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = Y>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/procedures/frozen_sets.rs:10:34
[INFO] [stderr]    |
[INFO] [stderr] 10 |     fn iter<'a>(&'a self) -> Box<'a + Iterator<Item = &'a Fold>> {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn 'a + Iterator<Item = &'a Fold>`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/procedures/mod.rs:9:34
[INFO] [stderr]   |
[INFO] [stderr] 9 |     fn iter<'a>(&'a self) -> Box<'a + Iterator<Item = &'a Fold>>;
[INFO] [stderr]   |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn 'a + Iterator<Item = &'a Fold>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_classification.rs:13:42
[INFO] [stderr]    |
[INFO] [stderr] 13 |     pub(crate) estimation_procedure: Box<Procedure>,
[INFO] [stderr]    |                                          ^^^^^^^^^ help: use `dyn`: `dyn Procedure`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_classification.rs:33:20
[INFO] [stderr]    |
[INFO] [stderr] 33 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&X, &Y)>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_classification.rs:33:52
[INFO] [stderr]    |
[INFO] [stderr] 33 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                                                    ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &X>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_classification.rs:33:80
[INFO] [stderr]    |
[INFO] [stderr] 33 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                                                                                ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = Y>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_classification.rs:66:20
[INFO] [stderr]    |
[INFO] [stderr] 66 |         F: Fn(&mut Iterator<Item = (&[X], &Y)>, &mut Iterator<Item = &[X]>)
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&[X], &Y)>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_classification.rs:66:54
[INFO] [stderr]    |
[INFO] [stderr] 66 |         F: Fn(&mut Iterator<Item = (&[X], &Y)>, &mut Iterator<Item = &[X]>)
[INFO] [stderr]    |                                                      ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &[X]>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_classification.rs:67:20
[INFO] [stderr]    |
[INFO] [stderr] 67 |             -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = Y>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_regression.rs:13:42
[INFO] [stderr]    |
[INFO] [stderr] 13 |     pub(crate) estimation_procedure: Box<Procedure>,
[INFO] [stderr]    |                                          ^^^^^^^^^ help: use `dyn`: `dyn Procedure`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_regression.rs:32:20
[INFO] [stderr]    |
[INFO] [stderr] 32 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&X, &Y)>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_regression.rs:32:52
[INFO] [stderr]    |
[INFO] [stderr] 32 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                                                    ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &X>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_regression.rs:32:80
[INFO] [stderr]    |
[INFO] [stderr] 32 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                                                                                ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = Y>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_regression.rs:65:20
[INFO] [stderr]    |
[INFO] [stderr] 65 |         F: Fn(&mut Iterator<Item = (&[X], &Y)>, &mut Iterator<Item = &[X]>)
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&[X], &Y)>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_regression.rs:65:54
[INFO] [stderr]    |
[INFO] [stderr] 65 |         F: Fn(&mut Iterator<Item = (&[X], &Y)>, &mut Iterator<Item = &[X]>)
[INFO] [stderr]    |                                                      ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &[X]>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/supervised_regression.rs:66:20
[INFO] [stderr]    |
[INFO] [stderr] 66 |             -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = Y>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/mod.rs:25:20
[INFO] [stderr]    |
[INFO] [stderr] 25 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&X, &Y)>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/mod.rs:25:52
[INFO] [stderr]    |
[INFO] [stderr] 25 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                                                    ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &X>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/mod.rs:25:80
[INFO] [stderr]    |
[INFO] [stderr] 25 |         F: Fn(&mut Iterator<Item = (&X, &Y)>, &mut Iterator<Item = &X>) -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                                                                                ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = Y>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/mod.rs:34:20
[INFO] [stderr]    |
[INFO] [stderr] 34 |         F: Fn(&mut Iterator<Item = (&[X], &Y)>, &mut Iterator<Item = &[X]>)
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&[X], &Y)>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/mod.rs:34:54
[INFO] [stderr]    |
[INFO] [stderr] 34 |         F: Fn(&mut Iterator<Item = (&[X], &Y)>, &mut Iterator<Item = &[X]>)
[INFO] [stderr]    |                                                      ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &[X]>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tasks/mod.rs:35:20
[INFO] [stderr]    |
[INFO] [stderr] 35 |             -> Box<Iterator<Item = Y>>,
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = Y>`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/openml_api/impls_from_json.rs:116:17
[INFO] [stderr]     |
[INFO] [stderr] 116 |             let mut rep = &mut folds[item.repeat];
[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/openml_api/impls_from_json.rs:121:17
[INFO] [stderr]     |
[INFO] [stderr] 121 |             let mut fold = &mut rep[item.fold];
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/openml_api/impls_from_json.rs:116:17
[INFO] [stderr]     |
[INFO] [stderr] 116 |             let mut rep = &mut folds[item.repeat];
[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/openml_api/impls_from_json.rs:121:17
[INFO] [stderr]     |
[INFO] [stderr] 121 |             let mut fold = &mut rep[item.fold];
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.34s
[INFO] running `"docker" "inspect" "635aff5ad84eacaaa9131ce77842d26c389ef31f0a6192e2b18601a96fe5d3a0"`
[INFO] running `"docker" "rm" "-f" "635aff5ad84eacaaa9131ce77842d26c389ef31f0a6192e2b18601a96fe5d3a0"`
[INFO] [stdout] 635aff5ad84eacaaa9131ce77842d26c389ef31f0a6192e2b18601a96fe5d3a0