[INFO] cloning repository https://github.com/tikue/fizzbuzz
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tikue/fizzbuzz" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftikue%2Ffizzbuzz", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftikue%2Ffizzbuzz'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9ad97dd64d1f0f8135f44e116c4eb983d1de1000
[INFO] checking tikue/fizzbuzz against master#7c4ac0603e9ee5295bc802c90575391288a69a8a for pr-124728
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftikue%2Ffizzbuzz" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tikue/fizzbuzz on toolchain 7c4ac0603e9ee5295bc802c90575391288a69a8a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7c4ac0603e9ee5295bc802c90575391288a69a8a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tikue/fizzbuzz
[INFO] finished tweaking git repo https://github.com/tikue/fizzbuzz
[INFO] tweaked toml for git repo https://github.com/tikue/fizzbuzz written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/tikue/fizzbuzz already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7c4ac0603e9ee5295bc802c90575391288a69a8a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking tikue/fizzbuzz against try#98ebbae35138252af77610c20ea5a5e8bf68d639 for pr-124728
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftikue%2Ffizzbuzz" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tikue/fizzbuzz on toolchain 98ebbae35138252af77610c20ea5a5e8bf68d639
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+98ebbae35138252af77610c20ea5a5e8bf68d639" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tikue/fizzbuzz
[INFO] finished tweaking git repo https://github.com/tikue/fizzbuzz
[INFO] tweaked toml for git repo https://github.com/tikue/fizzbuzz written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/tikue/fizzbuzz already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+98ebbae35138252af77610c20ea5a5e8bf68d639" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+98ebbae35138252af77610c20ea5a5e8bf68d639" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4dde6ac494270c17af063f77324dc5e5a5715a77eccbcd18208db2122ac01445
[INFO] running `Command { std: "docker" "start" "-a" "4dde6ac494270c17af063f77324dc5e5a5715a77eccbcd18208db2122ac01445", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4dde6ac494270c17af063f77324dc5e5a5715a77eccbcd18208db2122ac01445", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4dde6ac494270c17af063f77324dc5e5a5715a77eccbcd18208db2122ac01445", kill_on_drop: false }`
[INFO] [stdout] 4dde6ac494270c17af063f77324dc5e5a5715a77eccbcd18208db2122ac01445
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+98ebbae35138252af77610c20ea5a5e8bf68d639" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 84b46a74ea66c687be54f62942f7d370902a88642982d6ef99369cdceec5bcc5
[INFO] running `Command { std: "docker" "start" "-a" "84b46a74ea66c687be54f62942f7d370902a88642982d6ef99369cdceec5bcc5", kill_on_drop: false }`
[INFO] [stderr]     Checking fizzbuzz v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: `box_syntax` has been removed
[INFO] [stdout]   --> src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     box Const { x: a }
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: use `Box::new()` instead
[INFO] [stdout]    |
[INFO] [stdout] 16 |     Box::new(Const { x: a })
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `box_syntax` has been removed
[INFO] [stdout]   --> src/main.rs:42:29
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let x = test(5, "buzz", box Id);
[INFO] [stdout]    |                             ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: use `Box::new()` instead
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let x = test(5, "buzz", Box::new(Id));
[INFO] [stdout]    |                             ~~~~~~~~~~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `box_syntax` has been removed
[INFO] [stdout]   --> src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     box Const { x: a }
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: use `Box::new()` instead
[INFO] [stdout]    |
[INFO] [stdout] 16 |     Box::new(Const { x: a })
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `box_syntax` has been removed
[INFO] [stdout]   --> src/main.rs:42:29
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let x = test(5, "buzz", box Id);
[INFO] [stdout]    |                             ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: use `Box::new()` instead
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let x = test(5, "buzz", Box::new(Id));
[INFO] [stdout]    |                             ~~~~~~~~~~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `int` in this scope
[INFO] [stdout]   --> src/main.rs:34:16
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn fizzbuzz(n: int) -> String {
[INFO] [stdout]    |                ^^^
[INFO] [stdout]    |                |
[INFO] [stdout]    |                not found in this scope
[INFO] [stdout]    |                help: perhaps you intended to use this type: `i32`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: rust-call ABI is subject to change
[INFO] [stdout]  --> src/main.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 |     extern "rust-call" fn call(&self, (_,): (B,)) -> A {
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]   = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
[INFO] [stdout]   = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: rust-call ABI is subject to change
[INFO] [stdout]   --> src/main.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 |     extern "rust-call" fn call(&self, (a,): (A,)) -> A {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'fn_traits'
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | /     extern "rust-call" fn call(&self, (_,): (B,)) -> A {
[INFO] [stdout] 8 | |         self.x.clone()
[INFO] [stdout] 9 | |     }
[INFO] [stdout]   | |_____^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]   = help: add `#![feature(fn_traits)]` to the crate attributes to enable
[INFO] [stdout]   = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'fn_traits'
[INFO] [stdout]   --> src/main.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 | /     extern "rust-call" fn call(&self, (a,): (A,)) -> A {
[INFO] [stdout] 24 | |         a
[INFO] [stdout] 25 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]    = help: add `#![feature(fn_traits)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:15:30
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn const_<A, B>(a: A) -> Box<Fn<(B,), A> + Send> where A: Send + Clone {
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn const_<A, B>(a: A) -> Box<dyn Fn<(B,), A> + Send> where A: Send + Clone {
[INFO] [stdout]    |                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change
[INFO] [stdout]   --> src/main.rs:15:30
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn const_<A, B>(a: A) -> Box<Fn<(B,), A> + Send> where A: Send + Clone {
[INFO] [stdout]    |                              ^^^^^^^^^^^ help: use parenthetical notation instead: `Fn(B) -> ()`
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0107]: trait takes 1 generic argument but 2 generic arguments were supplied
[INFO] [stdout]   --> src/main.rs:15:30
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn const_<A, B>(a: A) -> Box<Fn<(B,), A> + Send> where A: Send + Clone {
[INFO] [stdout]    |                              ^^       - help: remove this generic argument
[INFO] [stdout]    |                              |
[INFO] [stdout]    |                              expected 1 generic argument
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0191]: the value of the associated type `Output` in `FnOnce` must be specified
[INFO] [stdout]   --> src/main.rs:15:30
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn const_<A, B>(a: A) -> Box<Fn<(B,), A> + Send> where A: Send + Clone {
[INFO] [stdout]    |                              ^^^^^^^^^^^ associated type `Output` must be specified
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change
[INFO] [stdout]  --> src/main.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl<A, B> Fn<(B,), A> for Const<A> where A: Send + Clone {
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]   = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
[INFO] [stdout]   = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0183]: manual implementations of `Fn` are experimental
[INFO] [stdout]  --> src/main.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl<A, B> Fn<(B,), A> for Const<A> where A: Send + Clone {
[INFO] [stdout]   |            ^^^^^^^^^^^ manual implementations of `Fn` are experimental
[INFO] [stdout]   |
[INFO] [stdout]   = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0107]: trait takes 1 generic argument but 2 generic arguments were supplied
[INFO] [stdout]  --> src/main.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl<A, B> Fn<(B,), A> for Const<A> where A: Send + Clone {
[INFO] [stdout]   |            ^^       - help: remove this generic argument
[INFO] [stdout]   |            |
[INFO] [stdout]   |            expected 1 generic argument
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change
[INFO] [stdout]   --> src/main.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl<A> Fn<(A,), A> for Id {
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0183]: manual implementations of `Fn` are experimental
[INFO] [stdout]   --> src/main.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl<A> Fn<(A,), A> for Id {
[INFO] [stdout]    |         ^^^^^^^^^^^ manual implementations of `Fn` are experimental
[INFO] [stdout]    |
[INFO] [stdout]    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0107]: trait takes 1 generic argument but 2 generic arguments were supplied
[INFO] [stdout]   --> src/main.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl<A> Fn<(A,), A> for Id {
[INFO] [stdout]    |         ^^       - help: remove this generic argument
[INFO] [stdout]    |         |
[INFO] [stdout]    |         expected 1 generic argument
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: expected a `FnMut(B)` closure, found `Const<A>`
[INFO] [stdout]  --> src/main.rs:6:28
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl<A, B> Fn<(B,), A> for Const<A> where A: Send + Clone {
[INFO] [stdout]   |                            ^^^^^^^^ expected an `FnMut(B)` closure, found `Const<A>`
[INFO] [stdout]   |
[INFO] [stdout]   = help: the trait `FnMut<(B,)>` is not implemented for `Const<A>`
[INFO] [stdout] note: required by a bound in `Fn`
[INFO] [stdout]  --> /rustc/98ebbae35138252af77610c20ea5a5e8bf68d639/library/core/src/ops/function.rs:76:1
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: expected a `FnOnce(B)` closure, found `Const<A>`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     extern "rust-call" fn call(&self, (_,): (B,)) -> A {
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected an `FnOnce(B)` closure, found `Const<A>`
[INFO] [stdout]   |
[INFO] [stdout]   = help: the trait `FnOnce<(B,)>` is not implemented for `Const<A>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `int` in this scope
[INFO] [stdout]   --> src/main.rs:34:16
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn fizzbuzz(n: int) -> String {
[INFO] [stdout]    |                ^^^
[INFO] [stdout]    |                |
[INFO] [stdout]    |                not found in this scope
[INFO] [stdout]    |                help: perhaps you intended to use this type: `i32`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: rust-call ABI is subject to change
[INFO] [stdout]  --> src/main.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 |     extern "rust-call" fn call(&self, (_,): (B,)) -> A {
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]   = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
[INFO] [stdout]   = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: rust-call ABI is subject to change
[INFO] [stdout]   --> src/main.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 |     extern "rust-call" fn call(&self, (a,): (A,)) -> A {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'fn_traits'
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | /     extern "rust-call" fn call(&self, (_,): (B,)) -> A {
[INFO] [stdout] 8 | |         self.x.clone()
[INFO] [stdout] 9 | |     }
[INFO] [stdout]   | |_____^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]   = help: add `#![feature(fn_traits)]` to the crate attributes to enable
[INFO] [stdout]   = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: expected a `FnMut(A)` closure, found `Id`
[INFO] [stdout]   --> src/main.rs:22:25
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl<A> Fn<(A,), A> for Id {
[INFO] [stdout]    |                         ^^ expected an `FnMut(A)` closure, found `Id`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FnMut<(A,)>` is not implemented for `Id`
[INFO] [stdout] note: required by a bound in `Fn`
[INFO] [stdout]   --> /rustc/98ebbae35138252af77610c20ea5a5e8bf68d639/library/core/src/ops/function.rs:76:1
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'fn_traits'
[INFO] [stdout]   --> src/main.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 | /     extern "rust-call" fn call(&self, (a,): (A,)) -> A {
[INFO] [stdout] 24 | |         a
[INFO] [stdout] 25 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]    = help: add `#![feature(fn_traits)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: expected a `FnOnce(A)` closure, found `Id`
[INFO] [stdout]   --> src/main.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     extern "rust-call" fn call(&self, (a,): (A,)) -> A {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected an `FnOnce(A)` closure, found `Id`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FnOnce<(A,)>` is not implemented for `Id`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:15:30
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn const_<A, B>(a: A) -> Box<Fn<(B,), A> + Send> where A: Send + Clone {
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn const_<A, B>(a: A) -> Box<dyn Fn<(B,), A> + Send> where A: Send + Clone {
[INFO] [stdout]    |                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change
[INFO] [stdout]   --> src/main.rs:15:30
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn const_<A, B>(a: A) -> Box<Fn<(B,), A> + Send> where A: Send + Clone {
[INFO] [stdout]    |                              ^^^^^^^^^^^ help: use parenthetical notation instead: `Fn(B) -> ()`
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:35:36
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let test = |d, s: &str, x: Box<Fn<(String,), String> + Send>|
[INFO] [stdout]    |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let test = |d, s: &str, x: Box<dyn Fn<(String,), String> + Send>|
[INFO] [stdout]    |                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change
[INFO] [stdout]   --> src/main.rs:35:36
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let test = |d, s: &str, x: Box<Fn<(String,), String> + Send>|
[INFO] [stdout]    |                                    ^^^^^^^^^^^^^^^^^^^^^ help: use parenthetical notation instead: `Fn(String) -> ()`
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0107]: trait takes 1 generic argument but 2 generic arguments were supplied
[INFO] [stdout]   --> src/main.rs:15:30
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn const_<A, B>(a: A) -> Box<Fn<(B,), A> + Send> where A: Send + Clone {
[INFO] [stdout]    |                              ^^       - help: remove this generic argument
[INFO] [stdout]    |                              |
[INFO] [stdout]    |                              expected 1 generic argument
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0191]: the value of the associated type `Output` in `FnOnce` must be specified
[INFO] [stdout]   --> src/main.rs:15:30
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn const_<A, B>(a: A) -> Box<Fn<(B,), A> + Send> where A: Send + Clone {
[INFO] [stdout]    |                              ^^^^^^^^^^^ associated type `Output` must be specified
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change
[INFO] [stdout]  --> src/main.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl<A, B> Fn<(B,), A> for Const<A> where A: Send + Clone {
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]   = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
[INFO] [stdout]   = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0107]: trait takes 1 generic argument but 2 generic arguments were supplied
[INFO] [stdout]   --> src/main.rs:35:36
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let test = |d, s: &str, x: Box<Fn<(String,), String> + Send>|
[INFO] [stdout]    |                                    ^^            ------ help: remove this generic argument
[INFO] [stdout]    |                                    |
[INFO] [stdout]    |                                    expected 1 generic argument
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0191]: the value of the associated type `Output` in `FnOnce` must be specified
[INFO] [stdout]   --> src/main.rs:35:36
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let test = |d, s: &str, x: Box<Fn<(String,), String> + Send>|
[INFO] [stdout]    |                                    ^^^^^^^^^^^^^^^^^^^^^ associated type `Output` must be specified
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'fn_traits'
[INFO] [stdout]   --> src/main.rs:37:38
[INFO] [stdout]    |
[INFO] [stdout] 37 |             const_(s.to_string() + x.call(("".to_string(),)))
[INFO] [stdout]    |                                      ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]    = help: add `#![feature(fn_traits)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0183]: manual implementations of `Fn` are experimental
[INFO] [stdout]  --> src/main.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl<A, B> Fn<(B,), A> for Const<A> where A: Send + Clone {
[INFO] [stdout]   |            ^^^^^^^^^^^ manual implementations of `Fn` are experimental
[INFO] [stdout]   |
[INFO] [stdout]   = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0107]: trait takes 1 generic argument but 2 generic arguments were supplied
[INFO] [stdout]  --> src/main.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl<A, B> Fn<(B,), A> for Const<A> where A: Send + Clone {
[INFO] [stdout]   |            ^^       - help: remove this generic argument
[INFO] [stdout]   |            |
[INFO] [stdout]   |            expected 1 generic argument
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change
[INFO] [stdout]   --> src/main.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl<A> Fn<(A,), A> for Id {
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0183]: manual implementations of `Fn` are experimental
[INFO] [stdout]   --> src/main.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl<A> Fn<(A,), A> for Id {
[INFO] [stdout]    |         ^^^^^^^^^^^ manual implementations of `Fn` are experimental
[INFO] [stdout]    |
[INFO] [stdout]    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0107]: trait takes 1 generic argument but 2 generic arguments were supplied
[INFO] [stdout]   --> src/main.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl<A> Fn<(A,), A> for Id {
[INFO] [stdout]    |         ^^       - help: remove this generic argument
[INFO] [stdout]    |         |
[INFO] [stdout]    |         expected 1 generic argument
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: expected a `FnMut(B)` closure, found `Const<A>`
[INFO] [stdout]  --> src/main.rs:6:28
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl<A, B> Fn<(B,), A> for Const<A> where A: Send + Clone {
[INFO] [stdout]   |                            ^^^^^^^^ expected an `FnMut(B)` closure, found `Const<A>`
[INFO] [stdout]   |
[INFO] [stdout]   = help: the trait `FnMut<(B,)>` is not implemented for `Const<A>`
[INFO] [stdout] note: required by a bound in `Fn`
[INFO] [stdout]  --> /rustc/98ebbae35138252af77610c20ea5a5e8bf68d639/library/core/src/ops/function.rs:76:1
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: expected a `FnOnce(B)` closure, found `Const<A>`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     extern "rust-call" fn call(&self, (_,): (B,)) -> A {
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected an `FnOnce(B)` closure, found `Const<A>`
[INFO] [stdout]   |
[INFO] [stdout]   = help: the trait `FnOnce<(B,)>` is not implemented for `Const<A>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: expected a `FnMut(A)` closure, found `Id`
[INFO] [stdout]   --> src/main.rs:22:25
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl<A> Fn<(A,), A> for Id {
[INFO] [stdout]    |                         ^^ expected an `FnMut(A)` closure, found `Id`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FnMut<(A,)>` is not implemented for `Id`
[INFO] [stdout] note: required by a bound in `Fn`
[INFO] [stdout]   --> /rustc/98ebbae35138252af77610c20ea5a5e8bf68d639/library/core/src/ops/function.rs:76:1
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: expected a `FnOnce(A)` closure, found `Id`
[INFO] [stdout]   --> src/main.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     extern "rust-call" fn call(&self, (a,): (A,)) -> A {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected an `FnOnce(A)` closure, found `Id`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FnOnce<(A,)>` is not implemented for `Id`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:37:36
[INFO] [stdout]    |
[INFO] [stdout] 37 |             const_(s.to_string() + x.call(("".to_string(),)))
[INFO] [stdout]    |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^ expected `&str`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:    expected reference `&str`
[INFO] [stdout]            found associated type `<dyn Fn<(String,)> + Send as FnOnce<(String,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<dyn Fn<(String,)> + Send as FnOnce<(String,)>>::Output` to `&str`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'fn_traits'
[INFO] [stdout]   --> src/main.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 |     x2.call((n.to_string(),))
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]    = help: add `#![feature(fn_traits)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:35:36
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let test = |d, s: &str, x: Box<Fn<(String,), String> + Send>|
[INFO] [stdout]    |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let test = |d, s: &str, x: Box<dyn Fn<(String,), String> + Send>|
[INFO] [stdout]    |                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change
[INFO] [stdout]   --> src/main.rs:35:36
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let test = |d, s: &str, x: Box<Fn<(String,), String> + Send>|
[INFO] [stdout]    |                                    ^^^^^^^^^^^^^^^^^^^^^ help: use parenthetical notation instead: `Fn(String) -> ()`
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]    = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0107]: trait takes 1 generic argument but 2 generic arguments were supplied
[INFO] [stdout]   --> src/main.rs:35:36
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let test = |d, s: &str, x: Box<Fn<(String,), String> + Send>|
[INFO] [stdout]    |                                    ^^            ------ help: remove this generic argument
[INFO] [stdout]    |                                    |
[INFO] [stdout]    |                                    expected 1 generic argument
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0191]: the value of the associated type `Output` in `FnOnce` must be specified
[INFO] [stdout]   --> src/main.rs:35:36
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let test = |d, s: &str, x: Box<Fn<(String,), String> + Send>|
[INFO] [stdout]    |                                    ^^^^^^^^^^^^^^^^^^^^^ associated type `Output` must be specified
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'fn_traits'
[INFO] [stdout]   --> src/main.rs:37:38
[INFO] [stdout]    |
[INFO] [stdout] 37 |             const_(s.to_string() + x.call(("".to_string(),)))
[INFO] [stdout]    |                                      ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]    = help: add `#![feature(fn_traits)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn fizzbuzz(n: int) -> String {
[INFO] [stdout]    |                        ------ expected `String` because of return type
[INFO] [stdout] ...
[INFO] [stdout] 44 |     x2.call((n.to_string(),))
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^ expected `String`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:       expected struct `String`
[INFO] [stdout]            found associated type `<dyn Fn<(String,)> + Send as FnOnce<(String,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<dyn Fn<(String,)> + Send as FnOnce<(String,)>>::Output` to `String`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:37:36
[INFO] [stdout]    |
[INFO] [stdout] 37 |             const_(s.to_string() + x.call(("".to_string(),)))
[INFO] [stdout]    |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^ expected `&str`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:    expected reference `&str`
[INFO] [stdout]            found associated type `<dyn Fn<(String,)> + Send as FnOnce<(String,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<dyn Fn<(String,)> + Send as FnOnce<(String,)>>::Output` to `&str`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'fn_traits'
[INFO] [stdout]   --> src/main.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 |     x2.call((n.to_string(),))
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
[INFO] [stdout]    = help: add `#![feature(fn_traits)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2024-05-05; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn fizzbuzz(n: int) -> String {
[INFO] [stdout]    |                        ------ expected `String` because of return type
[INFO] [stdout] ...
[INFO] [stdout] 44 |     x2.call((n.to_string(),))
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^ expected `String`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:       expected struct `String`
[INFO] [stdout]            found associated type `<dyn Fn<(String,)> + Send as FnOnce<(String,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<dyn Fn<(String,)> + Send as FnOnce<(String,)>>::Output` to `String`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/main.rs:48:25
[INFO] [stdout]    |
[INFO] [stdout] 48 |     assert!(fizzbuzz(3).as_slice() == "fizz");
[INFO] [stdout]    |                         ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/main.rs:48:25
[INFO] [stdout]    |
[INFO] [stdout] 48 |     assert!(fizzbuzz(3).as_slice() == "fizz");
[INFO] [stdout]    |                         ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/main.rs:49:25
[INFO] [stdout]    |
[INFO] [stdout] 49 |     assert!(fizzbuzz(5).as_slice() == "buzz");
[INFO] [stdout]    |                         ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/main.rs:49:25
[INFO] [stdout]    |
[INFO] [stdout] 49 |     assert!(fizzbuzz(5).as_slice() == "buzz");
[INFO] [stdout]    |                         ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/main.rs:50:26
[INFO] [stdout]    |
[INFO] [stdout] 50 |     assert!(fizzbuzz(15).as_slice() == "fizzbuzz");
[INFO] [stdout]    |                          ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/main.rs:50:26
[INFO] [stdout]    |
[INFO] [stdout] 50 |     assert!(fizzbuzz(15).as_slice() == "fizzbuzz");
[INFO] [stdout]    |                          ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/main.rs:51:25
[INFO] [stdout]    |
[INFO] [stdout] 51 |     assert!(fizzbuzz(7).as_slice() == "7");
[INFO] [stdout]    |                         ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 31 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0107, E0183, E0191, E0277, E0308, E0412, E0599, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0107`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fizzbuzz` (bin "fizzbuzz") due to 32 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/main.rs:51:25
[INFO] [stdout]    |
[INFO] [stdout] 51 |     assert!(fizzbuzz(7).as_slice() == "7");
[INFO] [stdout]    |                         ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 31 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0107, E0183, E0191, E0277, E0308, E0412, E0599, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0107`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fizzbuzz` (bin "fizzbuzz" test) due to 32 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "84b46a74ea66c687be54f62942f7d370902a88642982d6ef99369cdceec5bcc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84b46a74ea66c687be54f62942f7d370902a88642982d6ef99369cdceec5bcc5", kill_on_drop: false }`
[INFO] [stdout] 84b46a74ea66c687be54f62942f7d370902a88642982d6ef99369cdceec5bcc5