[INFO] fetching crate quickercheck 0.2.0...
[INFO] testing quickercheck-0.2.0 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate quickercheck 0.2.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate quickercheck 0.2.0 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate quickercheck 0.2.0
[INFO] finished tweaking crates.io crate quickercheck 0.2.0
[INFO] tweaked toml for crates.io crate quickercheck 0.2.0 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 34c68d9ee37d5619aa4d921750c2d34b8cc7d1ad2617ac7e2a5816bd8c301ea9
[INFO] running `Command { std: "docker" "start" "-a" "34c68d9ee37d5619aa4d921750c2d34b8cc7d1ad2617ac7e2a5816bd8c301ea9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "34c68d9ee37d5619aa4d921750c2d34b8cc7d1ad2617ac7e2a5816bd8c301ea9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "34c68d9ee37d5619aa4d921750c2d34b8cc7d1ad2617ac7e2a5816bd8c301ea9", kill_on_drop: false }`
[INFO] [stdout] 34c68d9ee37d5619aa4d921750c2d34b8cc7d1ad2617ac7e2a5816bd8c301ea9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9d2a6e6be9fd5a41615a4d842704f56795823eeaf279bc77312bd5b33922bb2e
[INFO] running `Command { std: "docker" "start" "-a" "9d2a6e6be9fd5a41615a4d842704f56795823eeaf279bc77312bd5b33922bb2e", kill_on_drop: false }`
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]    Compiling winapi v0.2.8
[INFO] [stderr]    Compiling regex-syntax v0.3.9
[INFO] [stderr]    Compiling utf8-ranges v0.1.3
[INFO] [stderr]    Compiling memchr v0.1.11
[INFO] [stderr]    Compiling aho-corasick v0.5.3
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]    Compiling thread-id v2.0.0
[INFO] [stderr]    Compiling thread_local v0.2.7
[INFO] [stderr]    Compiling regex v0.1.80
[INFO] [stderr]    Compiling env_logger v0.3.5
[INFO] [stderr]    Compiling quickercheck v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/generate.rs:39:38
[INFO] [stdout]    |
[INFO] [stdout] 39 |     fn generate<R: rand::Rng>(&self, &mut GenerateCtx<R>) -> <Self as Generator>::Output;
[INFO] [stdout]    |                                      ^^^^^^^^^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &mut GenerateCtx<R>`
[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/shrink.rs:65:33
[INFO] [stdout]    |
[INFO] [stdout] 65 |             type Iterator = Box<Iterator<Item=Self::Item>>;
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self::Item>`
[INFO] [stdout] ...
[INFO] [stdout] 89 | macro_tuples_impl!{tuple_impls}
[INFO] [stdout]    | ------------------------------- in this macro invocation
[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]    = note: this warning originates in the macro `tuple_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/shrink.rs:65:33
[INFO] [stdout]    |
[INFO] [stdout] 65 |             type Iterator = Box<Iterator<Item=Self::Item>>;
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self::Item>`
[INFO] [stdout] ...
[INFO] [stdout] 89 | macro_tuples_impl!{tuple_impls}
[INFO] [stdout]    | ------------------------------- in this macro invocation
[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]    = note: this warning originates in the macro `tuple_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/shrink.rs:65:33
[INFO] [stdout]    |
[INFO] [stdout] 65 |             type Iterator = Box<Iterator<Item=Self::Item>>;
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self::Item>`
[INFO] [stdout] ...
[INFO] [stdout] 89 | macro_tuples_impl!{tuple_impls}
[INFO] [stdout]    | ------------------------------- in this macro invocation
[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]    = note: this warning originates in the macro `tuple_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/shrink.rs:65:33
[INFO] [stdout]    |
[INFO] [stdout] 65 |             type Iterator = Box<Iterator<Item=Self::Item>>;
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self::Item>`
[INFO] [stdout] ...
[INFO] [stdout] 89 | macro_tuples_impl!{tuple_impls}
[INFO] [stdout]    | ------------------------------- in this macro invocation
[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]    = note: this warning originates in the macro `tuple_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/shrink.rs:65:33
[INFO] [stdout]    |
[INFO] [stdout] 65 |             type Iterator = Box<Iterator<Item=Self::Item>>;
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self::Item>`
[INFO] [stdout] ...
[INFO] [stdout] 89 | macro_tuples_impl!{tuple_impls}
[INFO] [stdout]    | ------------------------------- in this macro invocation
[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]    = note: this warning originates in the macro `tuple_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/shrink.rs:65:33
[INFO] [stdout]    |
[INFO] [stdout] 65 |             type Iterator = Box<Iterator<Item=Self::Item>>;
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self::Item>`
[INFO] [stdout] ...
[INFO] [stdout] 89 | macro_tuples_impl!{tuple_impls}
[INFO] [stdout]    | ------------------------------- in this macro invocation
[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]    = note: this warning originates in the macro `tuple_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/shrink.rs:65:33
[INFO] [stdout]    |
[INFO] [stdout] 65 |             type Iterator = Box<Iterator<Item=Self::Item>>;
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self::Item>`
[INFO] [stdout] ...
[INFO] [stdout] 89 | macro_tuples_impl!{tuple_impls}
[INFO] [stdout]    | ------------------------------- in this macro invocation
[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]    = note: this warning originates in the macro `tuple_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/shrink.rs:65:33
[INFO] [stdout]    |
[INFO] [stdout] 65 |             type Iterator = Box<Iterator<Item=Self::Item>>;
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self::Item>`
[INFO] [stdout] ...
[INFO] [stdout] 89 | macro_tuples_impl!{tuple_impls}
[INFO] [stdout]    | ------------------------------- in this macro invocation
[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]    = note: this warning originates in the macro `tuple_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/shrink.rs:65:33
[INFO] [stdout]    |
[INFO] [stdout] 65 |             type Iterator = Box<Iterator<Item=Self::Item>>;
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self::Item>`
[INFO] [stdout] ...
[INFO] [stdout] 89 | macro_tuples_impl!{tuple_impls}
[INFO] [stdout]    | ------------------------------- in this macro invocation
[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]    = note: this warning originates in the macro `tuple_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/shrink.rs:65:33
[INFO] [stdout]    |
[INFO] [stdout] 65 |             type Iterator = Box<Iterator<Item=Self::Item>>;
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self::Item>`
[INFO] [stdout] ...
[INFO] [stdout] 89 | macro_tuples_impl!{tuple_impls}
[INFO] [stdout]    | ------------------------------- in this macro invocation
[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]    = note: this warning originates in the macro `tuple_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/shrink.rs:65:33
[INFO] [stdout]    |
[INFO] [stdout] 65 |             type Iterator = Box<Iterator<Item=Self::Item>>;
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self::Item>`
[INFO] [stdout] ...
[INFO] [stdout] 89 | macro_tuples_impl!{tuple_impls}
[INFO] [stdout]    | ------------------------------- in this macro invocation
[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]    = note: this warning originates in the macro `tuple_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/shrink.rs:65:33
[INFO] [stdout]    |
[INFO] [stdout] 65 |             type Iterator = Box<Iterator<Item=Self::Item>>;
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self::Item>`
[INFO] [stdout] ...
[INFO] [stdout] 89 | macro_tuples_impl!{tuple_impls}
[INFO] [stdout]    | ------------------------------- in this macro invocation
[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]    = note: this warning originates in the macro `tuple_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/shrink.rs:105:37
[INFO] [stdout]     |
[INFO] [stdout] 105 |                 type Iterator = Box<Iterator<Item=Self::Item>>;
[INFO] [stdout]     |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self::Item>`
[INFO] [stdout] ...
[INFO] [stdout] 132 | int_impls! { i8, i16, i32, i64, isize }
[INFO] [stdout]     | --------------------------------------- in this macro invocation
[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]     = note: this warning originates in the macro `int_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/shrink.rs:148:37
[INFO] [stdout]     |
[INFO] [stdout] 148 |                 type Iterator = Box<Iterator<Item=Self::Item>>;
[INFO] [stdout]     |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self::Item>`
[INFO] [stdout] ...
[INFO] [stdout] 163 | uint_impls! { u8, u16, u32, u64, usize }
[INFO] [stdout]     | ---------------------------------------- in this macro invocation
[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]     = note: this warning originates in the macro `uint_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/shrink.rs:185:25
[INFO] [stdout]     |
[INFO] [stdout] 185 |     type Iterator = Box<Iterator<Item=Self::Item>>;
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self::Item>`
[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/shrink.rs:197:54
[INFO] [stdout]     |
[INFO] [stdout] 197 |                 .fold(Box::new(iter::empty()) as Box<Iterator<Item=C>>, |it, next| Box::new(it.chain(next)) )
[INFO] [stdout]     |                                                      ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/shrink.rs:210:42
[INFO] [stdout]     |
[INFO] [stdout] 210 | ...                   ) as Box<Iterator<Item=C>>
[INFO] [stdout]     |                                ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/shrink.rs:213:62
[INFO] [stdout]     |
[INFO] [stdout] 213 |                         .fold(Box::new(iter::empty()) as Box<Iterator<Item=C>>, |it, next| Box::new(it.chain(next)))
[INFO] [stdout]     |                                                              ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/shrink.rs:274:25
[INFO] [stdout]     |
[INFO] [stdout] 274 |     type Iterator = Box<Iterator<Item=bool>>;
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=bool>`
[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: unnecessary parentheses around type
[INFO] [stdout]    --> src/arbitrary.rs:102:67
[INFO] [stdout]     |
[INFO] [stdout] 102 |                   where $container<$($placeholder),*>: FromIterator<($($placeholder),*)> + IntoIterator<Item=($($placeholder),*)>
[INFO] [stdout]     |                                                                     ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] ...
[INFO] [stdout] 119 | / generic_impls! {
[INFO] [stdout] 120 | |     Vec<T>,
[INFO] [stdout] 121 | |     BTreeMap<K, V>,
[INFO] [stdout] 122 | |     BTreeSet<T>,
[INFO] [stdout] ...   |
[INFO] [stdout] 127 | |     VecDeque<T>
[INFO] [stdout] 128 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `generic_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/arbitrary.rs:102:108
[INFO] [stdout]     |
[INFO] [stdout] 102 |                   where $container<$($placeholder),*>: FromIterator<($($placeholder),*)> + IntoIterator<Item=($($placeholder),*)>
[INFO] [stdout]     |                                                                                                              ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] ...
[INFO] [stdout] 119 | / generic_impls! {
[INFO] [stdout] 120 | |     Vec<T>,
[INFO] [stdout] 121 | |     BTreeMap<K, V>,
[INFO] [stdout] 122 | |     BTreeSet<T>,
[INFO] [stdout] ...   |
[INFO] [stdout] 127 | |     VecDeque<T>
[INFO] [stdout] 128 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `generic_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/arbitrary.rs:104:88
[INFO] [stdout]     |
[INFO] [stdout] 104 |                   type Generator = FromIteratorGenerator<$container<$($placeholder),*>, <($($placeholder),*) as Arbitrary>::Generator>;
[INFO] [stdout]     |                                                                                          ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] ...
[INFO] [stdout] 119 | / generic_impls! {
[INFO] [stdout] 120 | |     Vec<T>,
[INFO] [stdout] 121 | |     BTreeMap<K, V>,
[INFO] [stdout] 122 | |     BTreeSet<T>,
[INFO] [stdout] ...   |
[INFO] [stdout] 127 | |     VecDeque<T>
[INFO] [stdout] 128 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `generic_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/arbitrary.rs:105:84
[INFO] [stdout]     |
[INFO] [stdout] 105 |                   type Shrink = FromIteratorShrinker<$container<$($placeholder),*>, <($($placeholder),*) as Arbitrary>::Shrink>;
[INFO] [stdout]     |                                                                                      ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] ...
[INFO] [stdout] 119 | / generic_impls! {
[INFO] [stdout] 120 | |     Vec<T>,
[INFO] [stdout] 121 | |     BTreeMap<K, V>,
[INFO] [stdout] 122 | |     BTreeSet<T>,
[INFO] [stdout] ...   |
[INFO] [stdout] 127 | |     VecDeque<T>
[INFO] [stdout] 128 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `generic_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/arbitrary.rs:102:67
[INFO] [stdout]     |
[INFO] [stdout] 102 |                   where $container<$($placeholder),*>: FromIterator<($($placeholder),*)> + IntoIterator<Item=($($placeholder),*)>
[INFO] [stdout]     |                                                                     ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] ...
[INFO] [stdout] 119 | / generic_impls! {
[INFO] [stdout] 120 | |     Vec<T>,
[INFO] [stdout] 121 | |     BTreeMap<K, V>,
[INFO] [stdout] 122 | |     BTreeSet<T>,
[INFO] [stdout] ...   |
[INFO] [stdout] 127 | |     VecDeque<T>
[INFO] [stdout] 128 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `generic_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/rose.rs:7:23
[INFO] [stdout]   |
[INFO] [stdout] 7 |     pub iterator: Box<Iterator<Item=Rose<T>>>
[INFO] [stdout]   |                       ^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Rose<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/rose.rs:33:31
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn iterator(&self) -> Box<Iterator<Item=Self>>;
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self>`
[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/rose.rs:78:28
[INFO] [stdout]    |
[INFO] [stdout] 78 |     where F: Fn(&T) -> Box<Iterator<Item=T>> + 'static
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=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/rose.rs:89:28
[INFO] [stdout]    |
[INFO] [stdout] 89 |     where F: Fn(&T) -> Box<Iterator<Item=T>> + 'static
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=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/rose.rs:93:31
[INFO] [stdout]    |
[INFO] [stdout] 93 |     fn iterator(&self) -> Box<Iterator<Item=Self>> {
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self>`
[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/rose.rs:109:32
[INFO] [stdout]     |
[INFO] [stdout] 109 |     where F: Fn(&S, &T) -> Box<Iterator<Item=T>> + 'static
[INFO] [stdout]     |                                ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=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/rose.rs:121:32
[INFO] [stdout]     |
[INFO] [stdout] 121 |     where F: Fn(&S, &T) -> Box<Iterator<Item=T>> + 'static
[INFO] [stdout]     |                                ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=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/rose.rs:125:31
[INFO] [stdout]     |
[INFO] [stdout] 125 |     fn iterator(&self) -> Box<Iterator<Item=Self>> {
[INFO] [stdout]     |                               ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Self>`
[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] error[E0495]: cannot infer an appropriate lifetime for lifetime parameter `'a` due to conflicting requirements
[INFO] [stdout]   --> src/generate.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |         Self::new(self.rng, self.size/2)
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: first, the lifetime cannot outlive the lifetime `'b` as defined on the method body at 19:17...
[INFO] [stdout]   --> src/generate.rs:19:17
[INFO] [stdout]    |
[INFO] [stdout] 19 |     pub fn chop<'b>(&'b mut self) -> GenerateCtx<'b, R>
[INFO] [stdout]    |                 ^^
[INFO] [stdout] note: ...so that reference does not outlive borrowed content
[INFO] [stdout]   --> src/generate.rs:22:19
[INFO] [stdout]    |
[INFO] [stdout] 22 |         Self::new(self.rng, self.size/2)
[INFO] [stdout]    |                   ^^^^^^^^
[INFO] [stdout] note: but, the lifetime must be valid for the lifetime `'a` as defined on the impl at 13:7...
[INFO] [stdout]   --> src/generate.rs:13:7
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl <'a, R: ?Sized + 'a> GenerateCtx<'a, R> {
[INFO] [stdout]    |       ^^
[INFO] [stdout] note: ...so that the types are compatible
[INFO] [stdout]   --> src/generate.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |         Self::new(self.rng, self.size/2)
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout]    = note: expected `GenerateCtx<'_, _>`
[INFO] [stdout]               found `GenerateCtx<'a, _>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 33 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0495`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `quickercheck` due to 2 previous errors; 33 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "9d2a6e6be9fd5a41615a4d842704f56795823eeaf279bc77312bd5b33922bb2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d2a6e6be9fd5a41615a4d842704f56795823eeaf279bc77312bd5b33922bb2e", kill_on_drop: false }`
[INFO] [stdout] 9d2a6e6be9fd5a41615a4d842704f56795823eeaf279bc77312bd5b33922bb2e
