[INFO] fetching crate fp-core 0.1.9...
[INFO] testing fp-core-0.1.9 against master#cdb45c87e2cd43495379f7e867e3cc15dcee9f93 for pr-145838-1
[INFO] extracting crate fp-core 0.1.9 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate fp-core 0.1.9
[INFO] finished tweaking crates.io crate fp-core 0.1.9
[INFO] tweaked toml for crates.io crate fp-core 0.1.9 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate fp-core 0.1.9 on toolchain cdb45c87e2cd43495379f7e867e3cc15dcee9f93
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 2 packages to latest compatible versions
[INFO] [stderr]       Adding itertools v0.8.2 (available: v0.14.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] abae3db3f5123baddec5b1ea8f3b6f6bd3bc4f7ca85ce843592607590a7cbe07
[INFO] running `Command { std: "docker" "start" "-a" "abae3db3f5123baddec5b1ea8f3b6f6bd3bc4f7ca85ce843592607590a7cbe07", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "abae3db3f5123baddec5b1ea8f3b6f6bd3bc4f7ca85ce843592607590a7cbe07", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "abae3db3f5123baddec5b1ea8f3b6f6bd3bc4f7ca85ce843592607590a7cbe07", kill_on_drop: false }`
[INFO] [stdout] abae3db3f5123baddec5b1ea8f3b6f6bd3bc4f7ca85ce843592607590a7cbe07
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bf1d83306612da16662f185ad2d7e192660e93395c39145e3a2092d171691be3
[INFO] running `Command { std: "docker" "start" "-a" "bf1d83306612da16662f185ad2d7e192660e93395c39145e3a2092d171691be3", kill_on_drop: false }`
[INFO] [stderr]    Compiling either v1.15.0
[INFO] [stderr]    Compiling itertools v0.8.2
[INFO] [stderr]    Compiling fp-core v0.1.9 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]  --> src/monoid.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::ops::Add;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]  --> src/semigroup.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::ops::Add;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/apply.rs:6:42
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub trait Apply<B>: Functor<B> + HKT<Box<Fn(<Self as HKT<B>>::Current) -> B>> {
[INFO] [stdout]   |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub trait Apply<B>: Functor<B> + HKT<Box<dyn Fn(<Self as HKT<B>>::Current) -> B>> {
[INFO] [stdout]   |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/apply.rs:4:47
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Applicator<B, S: HKT<B>> = <S as HKT<Box<Fn(<S as HKT<B>>::Current) -> B>>>::Target;
[INFO] [stdout]   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Applicator<B, S: HKT<B>> = <S as HKT<Box<dyn Fn(<S as HKT<B>>::Current) -> B>>>::Target;
[INFO] [stdout]   |                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/lens.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 |     fn over(s: &S, f: &Fn(Option<&A>) -> A) -> S {
[INFO] [stdout]   |                        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]   |
[INFO] [stdout] 2 |     fn over(s: &S, f: &dyn Fn(Option<&A>) -> A) -> S {
[INFO] [stdout]   |                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]   --> src/empty.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn empty() -> Self {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stdout] 31 |         Vec::empty()
[INFO] [stdout]    |         ------------ recursive call site
[INFO] [stdout]    |
[INFO] [stdout]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout]    = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]   --> src/empty.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn empty() -> Self {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stdout] 37 |         String::empty()
[INFO] [stdout]    |         --------------- recursive call site
[INFO] [stdout]    |
[INFO] [stdout]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: bounds on generic parameters in type aliases are not enforced
[INFO] [stdout]  --> src/apply.rs:4:23
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Applicator<B, S: HKT<B>> = <S as HKT<Box<Fn(<S as HKT<B>>::Current) -> B>>>::Target;
[INFO] [stdout]   |                     --^^^^^^
[INFO] [stdout]   |                     | |
[INFO] [stdout]   |                     | will not be checked at usage sites of the type alias
[INFO] [stdout]   |                     help: remove this bound
[INFO] [stdout]   |
[INFO] [stdout]   = note: this is a known limitation of the type checker that may be lifted in a future edition.
[INFO] [stdout]           see issue #112792 <https://github.com/rust-lang/rust/issues/112792> for more information
[INFO] [stdout]   = help: add `#![feature(lazy_type_alias)]` to the crate attributes to enable the desired semantics
[INFO] [stdout]   = note: `#[warn(type_alias_bounds)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.24s
[INFO] running `Command { std: "docker" "inspect" "bf1d83306612da16662f185ad2d7e192660e93395c39145e3a2092d171691be3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bf1d83306612da16662f185ad2d7e192660e93395c39145e3a2092d171691be3", kill_on_drop: false }`
[INFO] [stdout] bf1d83306612da16662f185ad2d7e192660e93395c39145e3a2092d171691be3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3366df4cb6731748a15158596c6f5b37f97991f5966413dfc7df6cf6b9a53d43
[INFO] running `Command { std: "docker" "start" "-a" "3366df4cb6731748a15158596c6f5b37f97991f5966413dfc7df6cf6b9a53d43", kill_on_drop: false }`
[INFO] [stderr]    Compiling fp-core v0.1.9 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]  --> src/monoid.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::ops::Add;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]  --> src/semigroup.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::ops::Add;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/apply.rs:6:42
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub trait Apply<B>: Functor<B> + HKT<Box<Fn(<Self as HKT<B>>::Current) -> B>> {
[INFO] [stdout]   |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub trait Apply<B>: Functor<B> + HKT<Box<dyn Fn(<Self as HKT<B>>::Current) -> B>> {
[INFO] [stdout]   |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/apply.rs:4:47
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Applicator<B, S: HKT<B>> = <S as HKT<Box<Fn(<S as HKT<B>>::Current) -> B>>>::Target;
[INFO] [stdout]   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Applicator<B, S: HKT<B>> = <S as HKT<Box<dyn Fn(<S as HKT<B>>::Current) -> B>>>::Target;
[INFO] [stdout]   |                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/lens.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 |     fn over(s: &S, f: &Fn(Option<&A>) -> A) -> S {
[INFO] [stdout]   |                        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]   |
[INFO] [stdout] 2 |     fn over(s: &S, f: &dyn Fn(Option<&A>) -> A) -> S {
[INFO] [stdout]   |                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]   --> src/empty.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn empty() -> Self {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stdout] 31 |         Vec::empty()
[INFO] [stdout]    |         ------------ recursive call site
[INFO] [stdout]    |
[INFO] [stdout]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout]    = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]   --> src/empty.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn empty() -> Self {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stdout] 37 |         String::empty()
[INFO] [stdout]    |         --------------- recursive call site
[INFO] [stdout]    |
[INFO] [stdout]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: bounds on generic parameters in type aliases are not enforced
[INFO] [stdout]  --> src/apply.rs:4:23
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Applicator<B, S: HKT<B>> = <S as HKT<Box<Fn(<S as HKT<B>>::Current) -> B>>>::Target;
[INFO] [stdout]   |                     --^^^^^^
[INFO] [stdout]   |                     | |
[INFO] [stdout]   |                     | will not be checked at usage sites of the type alias
[INFO] [stdout]   |                     help: remove this bound
[INFO] [stdout]   |
[INFO] [stdout]   = note: this is a known limitation of the type checker that may be lifted in a future edition.
[INFO] [stdout]           see issue #112792 <https://github.com/rust-lang/rust/issues/112792> for more information
[INFO] [stdout]   = help: add `#![feature(lazy_type_alias)]` to the crate attributes to enable the desired semantics
[INFO] [stdout]   = note: `#[warn(type_alias_bounds)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]  --> src/monoid.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::ops::Add;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]  --> src/semigroup.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::ops::Add;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/apply.rs:6:42
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub trait Apply<B>: Functor<B> + HKT<Box<Fn(<Self as HKT<B>>::Current) -> B>> {
[INFO] [stdout]   |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub trait Apply<B>: Functor<B> + HKT<Box<dyn Fn(<Self as HKT<B>>::Current) -> B>> {
[INFO] [stdout]   |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/apply.rs:4:47
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Applicator<B, S: HKT<B>> = <S as HKT<Box<Fn(<S as HKT<B>>::Current) -> B>>>::Target;
[INFO] [stdout]   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Applicator<B, S: HKT<B>> = <S as HKT<Box<dyn Fn(<S as HKT<B>>::Current) -> B>>>::Target;
[INFO] [stdout]   |                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/lens.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 |     fn over(s: &S, f: &Fn(Option<&A>) -> A) -> S {
[INFO] [stdout]   |                        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]   |
[INFO] [stdout] 2 |     fn over(s: &S, f: &dyn Fn(Option<&A>) -> A) -> S {
[INFO] [stdout]   |                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]   --> src/empty.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn empty() -> Self {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stdout] 31 |         Vec::empty()
[INFO] [stdout]    |         ------------ recursive call site
[INFO] [stdout]    |
[INFO] [stdout]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout]    = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]   --> src/empty.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn empty() -> Self {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stdout] 37 |         String::empty()
[INFO] [stdout]    |         --------------- recursive call site
[INFO] [stdout]    |
[INFO] [stdout]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: bounds on generic parameters in type aliases are not enforced
[INFO] [stdout]  --> src/apply.rs:4:23
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Applicator<B, S: HKT<B>> = <S as HKT<Box<Fn(<S as HKT<B>>::Current) -> B>>>::Target;
[INFO] [stdout]   |                     --^^^^^^
[INFO] [stdout]   |                     | |
[INFO] [stdout]   |                     | will not be checked at usage sites of the type alias
[INFO] [stdout]   |                     help: remove this bound
[INFO] [stdout]   |
[INFO] [stdout]   = note: this is a known limitation of the type checker that may be lifted in a future edition.
[INFO] [stdout]           see issue #112792 <https://github.com/rust-lang/rust/issues/112792> for more information
[INFO] [stdout]   = help: add `#![feature(lazy_type_alias)]` to the crate attributes to enable the desired semantics
[INFO] [stdout]   = note: `#[warn(type_alias_bounds)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.39s
[INFO] running `Command { std: "docker" "inspect" "3366df4cb6731748a15158596c6f5b37f97991f5966413dfc7df6cf6b9a53d43", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3366df4cb6731748a15158596c6f5b37f97991f5966413dfc7df6cf6b9a53d43", kill_on_drop: false }`
[INFO] [stdout] 3366df4cb6731748a15158596c6f5b37f97991f5966413dfc7df6cf6b9a53d43
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] b8cbf26a61e6182935637455a8edb0d4ff8b357e12078f204cedb4bca70619c1
[INFO] running `Command { std: "docker" "start" "-a" "b8cbf26a61e6182935637455a8edb0d4ff8b357e12078f204cedb4bca70619c1", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::ops::Add`
[INFO] [stderr]  --> src/monoid.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::ops::Add;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::ops::Add`
[INFO] [stderr]  --> src/semigroup.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::ops::Add;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/apply.rs:6:42
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub trait Apply<B>: Functor<B> + HKT<Box<Fn(<Self as HKT<B>>::Current) -> B>> {
[INFO] [stderr]   |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr]   = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub trait Apply<B>: Functor<B> + HKT<Box<dyn Fn(<Self as HKT<B>>::Current) -> B>> {
[INFO] [stderr]   |                                          +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/apply.rs:4:47
[INFO] [stderr]   |
[INFO] [stderr] 4 | type Applicator<B, S: HKT<B>> = <S as HKT<Box<Fn(<S as HKT<B>>::Current) -> B>>>::Target;
[INFO] [stderr]   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]   |
[INFO] [stderr] 4 | type Applicator<B, S: HKT<B>> = <S as HKT<Box<dyn Fn(<S as HKT<B>>::Current) -> B>>>::Target;
[INFO] [stderr]   |                                               +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/lens.rs:2:24
[INFO] [stderr]   |
[INFO] [stderr] 2 |     fn over(s: &S, f: &Fn(Option<&A>) -> A) -> S {
[INFO] [stderr]   |                        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]   |
[INFO] [stderr] 2 |     fn over(s: &S, f: &dyn Fn(Option<&A>) -> A) -> S {
[INFO] [stderr]   |                        +++
[INFO] [stderr] 
[INFO] [stderr] warning: function cannot return without recursing
[INFO] [stderr]   --> src/empty.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     fn empty() -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stderr] 31 |         Vec::empty()
[INFO] [stderr]    |         ------------ recursive call site
[INFO] [stderr]    |
[INFO] [stderr]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stderr]    = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function cannot return without recursing
[INFO] [stderr]   --> src/empty.rs:36:5
[INFO] [stderr]    |
[INFO] [stderr] 36 |     fn empty() -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stderr] 37 |         String::empty()
[INFO] [stderr]    |         --------------- recursive call site
[INFO] [stderr]    |
[INFO] [stderr]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stderr] 
[INFO] [stderr] warning: bounds on generic parameters in type aliases are not enforced
[INFO] [stderr]  --> src/apply.rs:4:23
[INFO] [stderr]   |
[INFO] [stderr] 4 | type Applicator<B, S: HKT<B>> = <S as HKT<Box<Fn(<S as HKT<B>>::Current) -> B>>>::Target;
[INFO] [stderr]   |                     --^^^^^^
[INFO] [stderr]   |                     | |
[INFO] [stderr]   |                     | will not be checked at usage sites of the type alias
[INFO] [stderr]   |                     help: remove this bound
[INFO] [stderr]   |
[INFO] [stderr]   = note: this is a known limitation of the type checker that may be lifted in a future edition.
[INFO] [stderr]           see issue #112792 <https://github.com/rust-lang/rust/issues/112792> for more information
[INFO] [stderr]   = help: add `#![feature(lazy_type_alias)]` to the crate attributes to enable the desired semantics
[INFO] [stderr]   = note: `#[warn(type_alias_bounds)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `fp-core` (lib) generated 8 warnings (run `cargo fix --lib -p fp-core` to apply 6 suggestions)
[INFO] [stderr] warning: `fp-core` (lib test) generated 8 warnings (8 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/fp_core-7f279f2514a3ea67)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]    Doc-tests fp_core
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "b8cbf26a61e6182935637455a8edb0d4ff8b357e12078f204cedb4bca70619c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b8cbf26a61e6182935637455a8edb0d4ff8b357e12078f204cedb4bca70619c1", kill_on_drop: false }`
[INFO] [stdout] b8cbf26a61e6182935637455a8edb0d4ff8b357e12078f204cedb4bca70619c1