[INFO] cloning repository https://github.com/rowanclarke/rs-collapse
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rowanclarke/rs-collapse" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frowanclarke%2Frs-collapse", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frowanclarke%2Frs-collapse'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4594364a041d271ab77afa2e20e8d1179c8e6c20
[INFO] checking rowanclarke/rs-collapse against 1.95.0 for pr-155915
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frowanclarke%2Frs-collapse" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/rowanclarke/rs-collapse
[INFO] finished tweaking git repo https://github.com/rowanclarke/rs-collapse
[INFO] tweaked toml for git repo https://github.com/rowanclarke/rs-collapse written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/rowanclarke/rs-collapse on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/rowanclarke/rs-collapse 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" "+1.95.0" "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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5292b92a7765b3d048327edfc3f8bed49ffdad2e491f9a3a10a7d9750decb667
[INFO] running `Command { std: "docker" "start" "-a" "5292b92a7765b3d048327edfc3f8bed49ffdad2e491f9a3a10a7d9750decb667", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5292b92a7765b3d048327edfc3f8bed49ffdad2e491f9a3a10a7d9750decb667", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5292b92a7765b3d048327edfc3f8bed49ffdad2e491f9a3a10a7d9750decb667", kill_on_drop: false }`
[INFO] [stdout] 5292b92a7765b3d048327edfc3f8bed49ffdad2e491f9a3a10a7d9750decb667
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fa030f014cca5f113b552a3c74bcc318b5eeca0b62e5312bc2d0bc746a7b0f28
[INFO] running `Command { std: "docker" "start" "-a" "fa030f014cca5f113b552a3c74bcc318b5eeca0b62e5312bc2d0bc746a7b0f28", kill_on_drop: false }`
[INFO] [stderr]     Checking either v1.8.0
[INFO] [stderr]     Checking itertools v0.10.5
[INFO] [stderr]     Checking rs-collapse v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | / #![feature(
[INFO] [stdout] 2 | |     type_alias_impl_trait,
[INFO] [stdout] 3 | |     return_position_impl_trait_in_trait,
[INFO] [stdout] 4 | |     impl_trait_projections
[INFO] [stdout] 5 | | )]
[INFO] [stdout]   | |__^
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `return_position_impl_trait_in_trait` has been stable since `1.75.0` and no longer requires an attribute to enable
[INFO] [stdout]   = help: the feature `impl_trait_projections` has been stable since `1.74.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `return_position_impl_trait_in_trait` has been stable since 1.75.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     return_position_impl_trait_in_trait,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `impl_trait_projections` has been stable since 1.74.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     impl_trait_projections
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | / #![feature(
[INFO] [stdout] 2 | |     type_alias_impl_trait,
[INFO] [stdout] 3 | |     return_position_impl_trait_in_trait,
[INFO] [stdout] 4 | |     impl_trait_projections
[INFO] [stdout] 5 | | )]
[INFO] [stdout]   | |__^
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `return_position_impl_trait_in_trait` has been stable since `1.75.0` and no longer requires an attribute to enable
[INFO] [stdout]   = help: the feature `impl_trait_projections` has been stable since `1.74.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `return_position_impl_trait_in_trait` has been stable since 1.75.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     return_position_impl_trait_in_trait,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `impl_trait_projections` has been stable since 1.74.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     impl_trait_projections
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rs-collapse` (lib) due to 1 previous error; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: impl trait in impl method signature does not match trait method signature
[INFO] [stdout]   --> src/tests/puzzle.rs:73:10
[INFO] [stdout]    |
[INFO] [stdout] 73 |       ) -> impl Iterator<
[INFO] [stdout]    |  __________^
[INFO] [stdout] 74 | |         Item = (
[INFO] [stdout] 75 | |             Box<dyn Iterator<Item = Self::Coordinate>>,
[INFO] [stdout] 76 | |             Rc<dyn Fn(Self::Item) -> bool>,
[INFO] [stdout] 77 | |         ),
[INFO] [stdout] 78 | |     > {
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/collapse.rs:26:10
[INFO] [stdout]    |
[INFO] [stdout] 26 |       ) -> impl Iterator<
[INFO] [stdout]    |  __________-
[INFO] [stdout] 27 | |         Item = (
[INFO] [stdout] 28 | |             impl Iterator<Item = Self::Coordinate>,
[INFO] [stdout] 29 | |             Rc<dyn Fn(Self::Item) -> bool>,
[INFO] [stdout] 30 | |         ),
[INFO] [stdout] 31 | |     >;
[INFO] [stdout]    | |_____- return type from trait method defined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: add `#[allow(refining_impl_trait)]` if it is intended for this to be part of the public API of this crate
[INFO] [stdout]    = note: we are soliciting feedback, see issue #121718 <https://github.com/rust-lang/rust/issues/121718> for more information
[INFO] [stdout]    = note: `#[warn(refining_impl_trait_internal)]` (part of `#[warn(refining_impl_trait)]`) on by default
[INFO] [stdout] help: replace the return type so that it matches the trait
[INFO] [stdout]    |
[INFO] [stdout] 73 -     ) -> impl Iterator<
[INFO] [stdout] 74 -         Item = (
[INFO] [stdout] 75 -             Box<dyn Iterator<Item = Self::Coordinate>>,
[INFO] [stdout] 76 -             Rc<dyn Fn(Self::Item) -> bool>,
[INFO] [stdout] 77 -         ),
[INFO] [stdout] 78 -     > {
[INFO] [stdout] 73 +     ) -> impl std::iter::Iterator<Item = (impl std::iter::Iterator<Item = <Self as collapse::Collapse>::Coordinate>, std::rc::Rc<(dyn std::ops::Fn(<Self as collapse::Collapse>::Item) -> bool + 'static)>)> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: impl trait in impl method signature does not match trait method signature
[INFO] [stdout]   --> src/tests/sudoku.rs:78:10
[INFO] [stdout]    |
[INFO] [stdout] 78 |       ) -> impl Iterator<
[INFO] [stdout]    |  __________^
[INFO] [stdout] 79 | |         Item = (
[INFO] [stdout] 80 | |             Box<dyn Iterator<Item = Self::Coordinate>>,
[INFO] [stdout] 81 | |             Rc<dyn Fn(Self::Item) -> bool>,
[INFO] [stdout] 82 | |         ),
[INFO] [stdout] 83 | |     > {
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/collapse.rs:26:10
[INFO] [stdout]    |
[INFO] [stdout] 26 |       ) -> impl Iterator<
[INFO] [stdout]    |  __________-
[INFO] [stdout] 27 | |         Item = (
[INFO] [stdout] 28 | |             impl Iterator<Item = Self::Coordinate>,
[INFO] [stdout] 29 | |             Rc<dyn Fn(Self::Item) -> bool>,
[INFO] [stdout] 30 | |         ),
[INFO] [stdout] 31 | |     >;
[INFO] [stdout]    | |_____- return type from trait method defined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: add `#[allow(refining_impl_trait)]` if it is intended for this to be part of the public API of this crate
[INFO] [stdout]    = note: we are soliciting feedback, see issue #121718 <https://github.com/rust-lang/rust/issues/121718> for more information
[INFO] [stdout] help: replace the return type so that it matches the trait
[INFO] [stdout]    |
[INFO] [stdout] 78 -     ) -> impl Iterator<
[INFO] [stdout] 79 -         Item = (
[INFO] [stdout] 80 -             Box<dyn Iterator<Item = Self::Coordinate>>,
[INFO] [stdout] 81 -             Rc<dyn Fn(Self::Item) -> bool>,
[INFO] [stdout] 82 -         ),
[INFO] [stdout] 83 -     > {
[INFO] [stdout] 78 +     ) -> impl std::iter::Iterator<Item = (impl std::iter::Iterator<Item = <Self as collapse::Collapse>::Coordinate>, std::rc::Rc<(dyn std::ops::Fn(<Self as collapse::Collapse>::Item) -> bool + 'static)>)> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rs-collapse` (lib test) due to 1 previous error; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "fa030f014cca5f113b552a3c74bcc318b5eeca0b62e5312bc2d0bc746a7b0f28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa030f014cca5f113b552a3c74bcc318b5eeca0b62e5312bc2d0bc746a7b0f28", kill_on_drop: false }`
[INFO] [stdout] fa030f014cca5f113b552a3c74bcc318b5eeca0b62e5312bc2d0bc746a7b0f28
