[INFO] fetching crate iter-skak 0.2.0...
[INFO] checking iter-skak-0.2.0 against master#4d1bd0db7f489b22c6d8aa2385937a95412c015b for pr-114682
[INFO] extracting crate iter-skak 0.2.0 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate iter-skak 0.2.0 on toolchain 4d1bd0db7f489b22c6d8aa2385937a95412c015b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4d1bd0db7f489b22c6d8aa2385937a95412c015b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate iter-skak 0.2.0
[INFO] finished tweaking crates.io crate iter-skak 0.2.0
[INFO] tweaked toml for crates.io crate iter-skak 0.2.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4d1bd0db7f489b22c6d8aa2385937a95412c015b" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4d1bd0db7f489b22c6d8aa2385937a95412c015b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+4d1bd0db7f489b22c6d8aa2385937a95412c015b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5017beb936e46a3374a3cd9de011e3a6fa8c822bb0eea814d4021a8120ef0dc0
[INFO] running `Command { std: "docker" "start" "-a" "5017beb936e46a3374a3cd9de011e3a6fa8c822bb0eea814d4021a8120ef0dc0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5017beb936e46a3374a3cd9de011e3a6fa8c822bb0eea814d4021a8120ef0dc0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5017beb936e46a3374a3cd9de011e3a6fa8c822bb0eea814d4021a8120ef0dc0", kill_on_drop: false }`
[INFO] [stdout] 5017beb936e46a3374a3cd9de011e3a6fa8c822bb0eea814d4021a8120ef0dc0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+4d1bd0db7f489b22c6d8aa2385937a95412c015b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d5f5f5493b98dd5eb70e82f9d62b82a367b10861d0614ce8105bec3bf85ec7ec
[INFO] running `Command { std: "docker" "start" "-a" "d5f5f5493b98dd5eb70e82f9d62b82a367b10861d0614ce8105bec3bf85ec7ec", kill_on_drop: false }`
[INFO] [stderr]     Checking iter-skak v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `rustc_attrs` is internal to the compiler or standard library
[INFO] [stdout]  --> src/lib.rs:1:29
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(core_intrinsics, rustc_attrs, iter_advance_by, try_trait_v2, try_blocks)]
[INFO] [stdout]   |                             ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: using it is strongly discouraged
[INFO] [stdout]   = note: `#[warn(internal_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `core_intrinsics` is internal to the compiler or standard library
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(core_intrinsics, rustc_attrs, iter_advance_by, try_trait_v2, try_blocks)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: using it is strongly discouraged
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `rustc_attrs` is internal to the compiler or standard library
[INFO] [stdout]  --> src/lib.rs:1:29
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(core_intrinsics, rustc_attrs, iter_advance_by, try_trait_v2, try_blocks)]
[INFO] [stdout]   |                             ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: using it is strongly discouraged
[INFO] [stdout]   = note: `#[warn(internal_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `core_intrinsics` is internal to the compiler or standard library
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(core_intrinsics, rustc_attrs, iter_advance_by, try_trait_v2, try_blocks)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: using it is strongly discouraged
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0053]: method `advance_by` has an incompatible type for trait
[INFO] [stdout]    --> src/lib.rs:110:43
[INFO] [stdout]     |
[INFO] [stdout] 110 |     fn advance_by(&mut self, n: usize) -> Result<(), usize> {
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                                           |
[INFO] [stdout]     |                                           expected `NonZeroUsize`, found `usize`
[INFO] [stdout]     |                                           help: change the output type to match the trait: `Result<(), NonZeroUsize>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected signature `fn(&mut Skip<_>, _) -> Result<_, NonZeroUsize>`
[INFO] [stdout]                found signature `fn(&mut Skip<_>, _) -> Result<_, usize>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0053]: method `advance_by` has an incompatible type for trait
[INFO] [stdout]    --> src/lib.rs:110:43
[INFO] [stdout]     |
[INFO] [stdout] 110 |     fn advance_by(&mut self, n: usize) -> Result<(), usize> {
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                                           |
[INFO] [stdout]     |                                           expected `NonZeroUsize`, found `usize`
[INFO] [stdout]     |                                           help: change the output type to match the trait: `Result<(), NonZeroUsize>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected signature `fn(&mut Skip<_>, _) -> Result<_, NonZeroUsize>`
[INFO] [stdout]                found signature `fn(&mut Skip<_>, _) -> Result<_, usize>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `saturating_sub` found for struct `NonZeroUsize` in the current scope
[INFO] [stdout]    --> src/lib.rs:120:54
[INFO] [stdout]     |
[INFO] [stdout] 120 |                 let advanced_without_skip = advanced.saturating_sub(self.n);
[INFO] [stdout]     |                                                      ^^^^^^^^^^^^^^ help: there is a method with a similar name: `saturating_mul`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `saturating_sub` found for struct `NonZeroUsize` in the current scope
[INFO] [stdout]    --> src/lib.rs:120:54
[INFO] [stdout]     |
[INFO] [stdout] 120 |                 let advanced_without_skip = advanced.saturating_sub(self.n);
[INFO] [stdout]     |                                                      ^^^^^^^^^^^^^^ help: there is a method with a similar name: `saturating_mul`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/lib.rs:121:48
[INFO] [stdout]     |
[INFO] [stdout] 121 |                 self.n = self.n.saturating_sub(advanced);
[INFO] [stdout]     |                                 -------------- ^^^^^^^^ expected `usize`, found `NonZeroUsize`
[INFO] [stdout]     |                                 |
[INFO] [stdout]     |                                 arguments to this method are incorrect
[INFO] [stdout]     |
[INFO] [stdout] note: method defined here
[INFO] [stdout]    --> /rustc/4d1bd0db7f489b22c6d8aa2385937a95412c015b/library/core/src/num/mod.rs:1269:5
[INFO] [stdout]     = note: this error originates in the macro `uint_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: call `Into::into` on this expression to convert `NonZeroUsize` into `usize`
[INFO] [stdout]     |
[INFO] [stdout] 121 |                 self.n = self.n.saturating_sub(advanced.into());
[INFO] [stdout]     |                                                        +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/lib.rs:121:48
[INFO] [stdout]     |
[INFO] [stdout] 121 |                 self.n = self.n.saturating_sub(advanced);
[INFO] [stdout]     |                                 -------------- ^^^^^^^^ expected `usize`, found `NonZeroUsize`
[INFO] [stdout]     |                                 |
[INFO] [stdout]     |                                 arguments to this method are incorrect
[INFO] [stdout]     |
[INFO] [stdout] note: method defined here
[INFO] [stdout]    --> /rustc/4d1bd0db7f489b22c6d8aa2385937a95412c015b/library/core/src/num/mod.rs:1269:5
[INFO] [stdout]     = note: this error originates in the macro `uint_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: call `Into::into` on this expression to convert `NonZeroUsize` into `usize`
[INFO] [stdout]     |
[INFO] [stdout] 121 |                 self.n = self.n.saturating_sub(advanced.into());
[INFO] [stdout]     |                                                        +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/lib.rs:129:32
[INFO] [stdout]     |
[INFO] [stdout] 129 |                 ret @ Ok(_) => ret,
[INFO] [stdout]     |                                ^^^ expected `Result<(), usize>`, found `Result<(), NonZeroUsize>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected enum `Result<_, usize>`
[INFO] [stdout]                found enum `Result<_, NonZeroUsize>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/lib.rs:129:32
[INFO] [stdout]     |
[INFO] [stdout] 129 |                 ret @ Ok(_) => ret,
[INFO] [stdout]     |                                ^^^ expected `Result<(), usize>`, found `Result<(), NonZeroUsize>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected enum `Result<_, usize>`
[INFO] [stdout]                found enum `Result<_, NonZeroUsize>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: cannot subtract-assign `NonZeroUsize` from `usize`
[INFO] [stdout]    --> src/lib.rs:131:25
[INFO] [stdout]     |
[INFO] [stdout] 131 |                     rem -= advanced;
[INFO] [stdout]     |                         ^^ no implementation for `usize -= NonZeroUsize`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `SubAssign<NonZeroUsize>` is not implemented for `usize`
[INFO] [stdout]     = help: the following other types implement trait `SubAssign<Rhs>`:
[INFO] [stdout]               <usize as SubAssign>
[INFO] [stdout]               <usize as SubAssign<&usize>>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: cannot subtract-assign `NonZeroUsize` from `usize`
[INFO] [stdout]    --> src/lib.rs:131:25
[INFO] [stdout]     |
[INFO] [stdout] 131 |                     rem -= advanced;
[INFO] [stdout]     |                         ^^ no implementation for `usize -= NonZeroUsize`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `SubAssign<NonZeroUsize>` is not implemented for `usize`
[INFO] [stdout]     = help: the following other types implement trait `SubAssign<Rhs>`:
[INFO] [stdout]               <usize as SubAssign>
[INFO] [stdout]               <usize as SubAssign<&usize>>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0053, E0277, E0308, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0053`.
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0053, E0277, E0308, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0053`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `iter-skak` (lib) due to 6 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `iter-skak` (lib test) due to 6 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "d5f5f5493b98dd5eb70e82f9d62b82a367b10861d0614ce8105bec3bf85ec7ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5f5f5493b98dd5eb70e82f9d62b82a367b10861d0614ce8105bec3bf85ec7ec", kill_on_drop: false }`
[INFO] [stdout] d5f5f5493b98dd5eb70e82f9d62b82a367b10861d0614ce8105bec3bf85ec7ec
[INFO] checking iter-skak-0.2.0 against try#785364c7e5e0804473a3fddfb579798ea14e3493 for pr-114682
[INFO] extracting crate iter-skak 0.2.0 into /workspace/builds/worker-0-tc2/source
[INFO] validating manifest of crates.io crate iter-skak 0.2.0 on toolchain 785364c7e5e0804473a3fddfb579798ea14e3493
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+785364c7e5e0804473a3fddfb579798ea14e3493" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate iter-skak 0.2.0
[INFO] finished tweaking crates.io crate iter-skak 0.2.0
[INFO] tweaked toml for crates.io crate iter-skak 0.2.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+785364c7e5e0804473a3fddfb579798ea14e3493" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+785364c7e5e0804473a3fddfb579798ea14e3493" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+785364c7e5e0804473a3fddfb579798ea14e3493" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8f8801a249d777e47cb6d4c406a39643547924b4681d116cb7770570379595d1
[INFO] running `Command { std: "docker" "start" "-a" "8f8801a249d777e47cb6d4c406a39643547924b4681d116cb7770570379595d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8f8801a249d777e47cb6d4c406a39643547924b4681d116cb7770570379595d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f8801a249d777e47cb6d4c406a39643547924b4681d116cb7770570379595d1", kill_on_drop: false }`
[INFO] [stdout] 8f8801a249d777e47cb6d4c406a39643547924b4681d116cb7770570379595d1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+785364c7e5e0804473a3fddfb579798ea14e3493" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 69e749634da416e2d73a5559b4dfb235a67dc59ce089f5cceebf5c1598bc96b5
[INFO] running `Command { std: "docker" "start" "-a" "69e749634da416e2d73a5559b4dfb235a67dc59ce089f5cceebf5c1598bc96b5", kill_on_drop: false }`
[INFO] [stderr]     Checking iter-skak v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `rustc_attrs` is internal to the compiler or standard library
[INFO] [stdout]  --> src/lib.rs:1:29
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(core_intrinsics, rustc_attrs, iter_advance_by, try_trait_v2, try_blocks)]
[INFO] [stdout]   |                             ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: using it is strongly discouraged
[INFO] [stdout]   = note: `#[warn(internal_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `core_intrinsics` is internal to the compiler or standard library
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(core_intrinsics, rustc_attrs, iter_advance_by, try_trait_v2, try_blocks)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: using it is strongly discouraged
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `rustc_attrs` is internal to the compiler or standard library
[INFO] [stdout]  --> src/lib.rs:1:29
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(core_intrinsics, rustc_attrs, iter_advance_by, try_trait_v2, try_blocks)]
[INFO] [stdout]   |                             ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: using it is strongly discouraged
[INFO] [stdout]   = note: `#[warn(internal_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `core_intrinsics` is internal to the compiler or standard library
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(core_intrinsics, rustc_attrs, iter_advance_by, try_trait_v2, try_blocks)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: using it is strongly discouraged
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0053]: method `advance_by` has an incompatible type for trait
[INFO] [stdout]    --> src/lib.rs:110:43
[INFO] [stdout]     |
[INFO] [stdout] 110 |     fn advance_by(&mut self, n: usize) -> Result<(), usize> {
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                                           |
[INFO] [stdout]     |                                           expected `NonZeroUsize`, found `usize`
[INFO] [stdout]     |                                           help: change the output type to match the trait: `Result<(), NonZeroUsize>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected signature `fn(&mut Skip<_>, _) -> Result<_, NonZeroUsize>`
[INFO] [stdout]                found signature `fn(&mut Skip<_>, _) -> Result<_, usize>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0053]: method `advance_by` has an incompatible type for trait
[INFO] [stdout]    --> src/lib.rs:110:43
[INFO] [stdout]     |
[INFO] [stdout] 110 |     fn advance_by(&mut self, n: usize) -> Result<(), usize> {
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                                           |
[INFO] [stdout]     |                                           expected `NonZeroUsize`, found `usize`
[INFO] [stdout]     |                                           help: change the output type to match the trait: `Result<(), NonZeroUsize>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected signature `fn(&mut Skip<_>, _) -> Result<_, NonZeroUsize>`
[INFO] [stdout]                found signature `fn(&mut Skip<_>, _) -> Result<_, usize>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `saturating_sub` found for struct `NonZeroUsize` in the current scope
[INFO] [stdout]    --> src/lib.rs:120:54
[INFO] [stdout]     |
[INFO] [stdout] 120 |                 let advanced_without_skip = advanced.saturating_sub(self.n);
[INFO] [stdout]     |                                                      ^^^^^^^^^^^^^^ help: there is a method with a similar name: `saturating_mul`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `saturating_sub` found for struct `NonZeroUsize` in the current scope
[INFO] [stdout]    --> src/lib.rs:120:54
[INFO] [stdout]     |
[INFO] [stdout] 120 |                 let advanced_without_skip = advanced.saturating_sub(self.n);
[INFO] [stdout]     |                                                      ^^^^^^^^^^^^^^ help: there is a method with a similar name: `saturating_mul`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/lib.rs:121:48
[INFO] [stdout]     |
[INFO] [stdout] 121 |                 self.n = self.n.saturating_sub(advanced);
[INFO] [stdout]     |                                 -------------- ^^^^^^^^ expected `usize`, found `NonZeroUsize`
[INFO] [stdout]     |                                 |
[INFO] [stdout]     |                                 arguments to this method are incorrect
[INFO] [stdout]     |
[INFO] [stdout] note: method defined here
[INFO] [stdout]    --> /rustc/785364c7e5e0804473a3fddfb579798ea14e3493/library/core/src/num/mod.rs:1269:5
[INFO] [stdout]     = note: this error originates in the macro `uint_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: call `Into::into` on this expression to convert `NonZeroUsize` into `usize`
[INFO] [stdout]     |
[INFO] [stdout] 121 |                 self.n = self.n.saturating_sub(advanced.into());
[INFO] [stdout]     |                                                        +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/lib.rs:121:48
[INFO] [stdout]     |
[INFO] [stdout] 121 |                 self.n = self.n.saturating_sub(advanced);
[INFO] [stdout]     |                                 -------------- ^^^^^^^^ expected `usize`, found `NonZeroUsize`
[INFO] [stdout]     |                                 |
[INFO] [stdout]     |                                 arguments to this method are incorrect
[INFO] [stdout]     |
[INFO] [stdout] note: method defined here
[INFO] [stdout]    --> /rustc/785364c7e5e0804473a3fddfb579798ea14e3493/library/core/src/num/mod.rs:1269:5
[INFO] [stdout]     = note: this error originates in the macro `uint_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: call `Into::into` on this expression to convert `NonZeroUsize` into `usize`
[INFO] [stdout]     |
[INFO] [stdout] 121 |                 self.n = self.n.saturating_sub(advanced.into());
[INFO] [stdout]     |                                                        +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/lib.rs:129:32
[INFO] [stdout]     |
[INFO] [stdout] 129 |                 ret @ Ok(_) => ret,
[INFO] [stdout]     |                                ^^^ expected `Result<(), usize>`, found `Result<(), NonZeroUsize>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected enum `Result<_, usize>`
[INFO] [stdout]                found enum `Result<_, NonZeroUsize>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/lib.rs:129:32
[INFO] [stdout]     |
[INFO] [stdout] 129 |                 ret @ Ok(_) => ret,
[INFO] [stdout]     |                                ^^^ expected `Result<(), usize>`, found `Result<(), NonZeroUsize>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected enum `Result<_, usize>`
[INFO] [stdout]                found enum `Result<_, NonZeroUsize>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: cannot subtract-assign `NonZeroUsize` from `usize`
[INFO] [stdout]    --> src/lib.rs:131:25
[INFO] [stdout]     |
[INFO] [stdout] 131 |                     rem -= advanced;
[INFO] [stdout]     |                         ^^ no implementation for `usize -= NonZeroUsize`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `SubAssign<NonZeroUsize>` is not implemented for `usize`
[INFO] [stdout]     = help: the following other types implement trait `SubAssign<Rhs>`:
[INFO] [stdout]               <usize as SubAssign>
[INFO] [stdout]               <usize as SubAssign<&usize>>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: cannot subtract-assign `NonZeroUsize` from `usize`
[INFO] [stdout]    --> src/lib.rs:131:25
[INFO] [stdout]     |
[INFO] [stdout] 131 |                     rem -= advanced;
[INFO] [stdout]     |                         ^^ no implementation for `usize -= NonZeroUsize`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `SubAssign<NonZeroUsize>` is not implemented for `usize`
[INFO] [stdout]     = help: the following other types implement trait `SubAssign<Rhs>`:
[INFO] [stdout]               <usize as SubAssign>
[INFO] [stdout]               <usize as SubAssign<&usize>>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0053, E0277, E0308, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0053`.
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0053, E0277, E0308, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0053`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `iter-skak` (lib) due to 6 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `iter-skak` (lib test) due to 6 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "69e749634da416e2d73a5559b4dfb235a67dc59ce089f5cceebf5c1598bc96b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69e749634da416e2d73a5559b4dfb235a67dc59ce089f5cceebf5c1598bc96b5", kill_on_drop: false }`
[INFO] [stdout] 69e749634da416e2d73a5559b4dfb235a67dc59ce089f5cceebf5c1598bc96b5
