[INFO] cloning repository https://github.com/lbuchli/kern
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lbuchli/kern" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flbuchli%2Fkern", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flbuchli%2Fkern'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5131614d360f2137997e18587f755da59d395311
[INFO] checking lbuchli/kern against 1.55.0 for beta-1.56-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flbuchli%2Fkern" "/workspace/builds/worker-53/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-53/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lbuchli/kern on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/lbuchli/kern
[INFO] finished tweaking git repo https://github.com/lbuchli/kern
[INFO] tweaked toml for git repo https://github.com/lbuchli/kern written to /workspace/builds/worker-53/source/Cargo.toml
[INFO] crate git repo https://github.com/lbuchli/kern already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fb71af4c670300473ab07deb9fc5779435cf869c5db5f4b1472a58d912bba601
[INFO] running `Command { std: "docker" "start" "-a" "fb71af4c670300473ab07deb9fc5779435cf869c5db5f4b1472a58d912bba601", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fb71af4c670300473ab07deb9fc5779435cf869c5db5f4b1472a58d912bba601", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb71af4c670300473ab07deb9fc5779435cf869c5db5f4b1472a58d912bba601", kill_on_drop: false }`
[INFO] [stdout] fb71af4c670300473ab07deb9fc5779435cf869c5db5f4b1472a58d912bba601
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9ea79443f76b5fc4fd0eb257f5978ed502358ddd01ef74d9ed2aae57578e8c0f
[INFO] running `Command { std: "docker" "start" "-a" "9ea79443f76b5fc4fd0eb257f5978ed502358ddd01ef74d9ed2aae57578e8c0f", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.8
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling peg-runtime v0.6.2
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling peg-macros v0.6.2
[INFO] [stderr]     Checking peg v0.6.2
[INFO] [stderr]     Checking kern v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/reducer.rs:59:20
[INFO] [stdout]    |
[INFO] [stdout] 59 |             if let HNode::Application(ref left, _) = *last {
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^   ----- this expression has type `Ref<'_, reducer::HNode<'_>>`
[INFO] [stdout]    |                    |
[INFO] [stdout]    |                    expected struct `Ref`, found enum `reducer::HNode`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected struct `Ref<'_, reducer::HNode<'_>, >`
[INFO] [stdout]                 found enum `reducer::HNode<'_>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/reducer.rs:59:20
[INFO] [stdout]    |
[INFO] [stdout] 59 |             if let HNode::Application(ref left, _) = *last {
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^   ----- this expression has type `Ref<'_, reducer::HNode<'_>>`
[INFO] [stdout]    |                    |
[INFO] [stdout]    |                    expected struct `Ref`, found enum `reducer::HNode`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected struct `Ref<'_, reducer::HNode<'_>, >`
[INFO] [stdout]                 found enum `reducer::HNode<'_>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `get` found for reference `&reducer::NodeBox<'_>` in the current scope
[INFO] [stdout]   --> src/reducer.rs:60:39
[INFO] [stdout]    |
[INFO] [stdout] 60 |                 spine_stack.push(left.get());
[INFO] [stdout]    |                                       ^^^ method not found in `&reducer::NodeBox<'_>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout]    = note: the following trait defines an item `get`, perhaps you need to implement it:
[INFO] [stdout]            candidate #1: `SliceIndex`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `get` found for reference `&reducer::NodeBox<'a>` in the current scope
[INFO] [stdout]   --> src/reducer.rs:69:64
[INFO] [stdout]    |
[INFO] [stdout] 69 |         let mut spine_stack = vec![self.stack.first().unwrap().get()];
[INFO] [stdout]    |                                                                ^^^ method not found in `&reducer::NodeBox<'a>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout]    = note: the following trait defines an item `get`, perhaps you need to implement it:
[INFO] [stdout]            candidate #1: `SliceIndex`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `get` found for struct `reducer::NodeBox` in the current scope
[INFO] [stdout]   --> src/reducer.rs:72:39
[INFO] [stdout]    |
[INFO] [stdout] 8  | pub struct NodeBox<'a>(Rc<RefCell<HNode<'a>>>);
[INFO] [stdout]    | ----------------------------------------------- method `get` not found for this
[INFO] [stdout] ...
[INFO] [stdout] 72 |                 spine_stack.push(left.get());
[INFO] [stdout]    |                                       ^^^ method not found in `reducer::NodeBox<'_>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout]    = note: the following trait defines an item `get`, perhaps you need to implement it:
[INFO] [stdout]            candidate #1: `SliceIndex`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `get` found for reference `&reducer::NodeBox<'_>` in the current scope
[INFO] [stdout]   --> src/reducer.rs:60:39
[INFO] [stdout]    |
[INFO] [stdout] 60 |                 spine_stack.push(left.get());
[INFO] [stdout]    |                                       ^^^ method not found in `&reducer::NodeBox<'_>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout]    = note: the following trait defines an item `get`, perhaps you need to implement it:
[INFO] [stdout]            candidate #1: `SliceIndex`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `get` found for struct `reducer::NodeBox` in the current scope
[INFO] [stdout]   --> src/reducer.rs:91:55
[INFO] [stdout]    |
[INFO] [stdout] 8  | pub struct NodeBox<'a>(Rc<RefCell<HNode<'a>>>);
[INFO] [stdout]    | ----------------------------------------------- method `get` not found for this
[INFO] [stdout] ...
[INFO] [stdout] 91 |                     if let HNode::Number(a) = right_a.get() {
[INFO] [stdout]    |                                                       ^^^ method not found in `reducer::NodeBox<'_>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout]    = note: the following trait defines an item `get`, perhaps you need to implement it:
[INFO] [stdout]            candidate #1: `SliceIndex`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `get` found for struct `reducer::NodeBox` in the current scope
[INFO] [stdout]   --> src/reducer.rs:95:67
[INFO] [stdout]    |
[INFO] [stdout] 8  | pub struct NodeBox<'a>(Rc<RefCell<HNode<'a>>>);
[INFO] [stdout]    | ----------------------------------------------- method `get` not found for this
[INFO] [stdout] ...
[INFO] [stdout] 95 |                                 if let HNode::Number(b) = right_b.get() {
[INFO] [stdout]    |                                                                   ^^^ method not found in `reducer::NodeBox<'_>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout]    = note: the following trait defines an item `get`, perhaps you need to implement it:
[INFO] [stdout]            candidate #1: `SliceIndex`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `get` found for reference `&reducer::NodeBox<'a>` in the current scope
[INFO] [stdout]   --> src/reducer.rs:69:64
[INFO] [stdout]    |
[INFO] [stdout] 69 |         let mut spine_stack = vec![self.stack.first().unwrap().get()];
[INFO] [stdout]    |                                                                ^^^ method not found in `&reducer::NodeBox<'a>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout]    = note: the following trait defines an item `get`, perhaps you need to implement it:
[INFO] [stdout]            candidate #1: `SliceIndex`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `get` found for struct `reducer::NodeBox` in the current scope
[INFO] [stdout]   --> src/reducer.rs:72:39
[INFO] [stdout]    |
[INFO] [stdout] 8  | pub struct NodeBox<'a>(Rc<RefCell<HNode<'a>>>);
[INFO] [stdout]    | ----------------------------------------------- method `get` not found for this
[INFO] [stdout] ...
[INFO] [stdout] 72 |                 spine_stack.push(left.get());
[INFO] [stdout]    |                                       ^^^ method not found in `reducer::NodeBox<'_>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout]    = note: the following trait defines an item `get`, perhaps you need to implement it:
[INFO] [stdout]            candidate #1: `SliceIndex`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 6 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `get` found for struct `reducer::NodeBox` in the current scope
[INFO] [stdout]   --> src/reducer.rs:91:55
[INFO] [stdout]    |
[INFO] [stdout] 8  | pub struct NodeBox<'a>(Rc<RefCell<HNode<'a>>>);
[INFO] [stdout]    | ----------------------------------------------- method `get` not found for this
[INFO] [stdout] ...
[INFO] [stdout] 91 |                     if let HNode::Number(a) = right_a.get() {
[INFO] [stdout]    |                                                       ^^^ method not found in `reducer::NodeBox<'_>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout]    = note: the following trait defines an item `get`, perhaps you need to implement it:
[INFO] [stdout]            candidate #1: `SliceIndex`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `kern` due to 7 previous errors
[INFO] [stdout] error[E0599]: no method named `get` found for struct `reducer::NodeBox` in the current scope
[INFO] [stdout]   --> src/reducer.rs:95:67
[INFO] [stdout]    |
[INFO] [stdout] 8  | pub struct NodeBox<'a>(Rc<RefCell<HNode<'a>>>);
[INFO] [stdout]    | ----------------------------------------------- method `get` not found for this
[INFO] [stdout] ...
[INFO] [stdout] 95 |                                 if let HNode::Number(b) = right_b.get() {
[INFO] [stdout]    |                                                                   ^^^ method not found in `reducer::NodeBox<'_>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout]    = note: the following trait defines an item `get`, perhaps you need to implement it:
[INFO] [stdout]            candidate #1: `SliceIndex`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to 6 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "9ea79443f76b5fc4fd0eb257f5978ed502358ddd01ef74d9ed2aae57578e8c0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ea79443f76b5fc4fd0eb257f5978ed502358ddd01ef74d9ed2aae57578e8c0f", kill_on_drop: false }`
[INFO] [stdout] 9ea79443f76b5fc4fd0eb257f5978ed502358ddd01ef74d9ed2aae57578e8c0f
