[INFO] fetching crate cheddar 0.2.1...
[INFO] checking cheddar-0.2.1 against 1.55.0 for beta-1.56-3
[INFO] extracting crate cheddar 0.2.1 into /workspace/builds/worker-95/source
[INFO] validating manifest of crates.io crate cheddar 0.2.1 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 crates.io crate cheddar 0.2.1
[INFO] finished tweaking crates.io crate cheddar 0.2.1
[INFO] tweaked toml for crates.io crate cheddar 0.2.1 written to /workspace/builds/worker-95/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded any-cache v0.2.3
[INFO] [stderr]   Downloaded glsl v0.9.2
[INFO] [stderr]   Downloaded warmy v0.10.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/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] fc7c9f84192a4b29d743d951c648a9abfae481fe2fce467a94b6f901789cbd49
[INFO] running `Command { std: "docker" "start" "-a" "fc7c9f84192a4b29d743d951c648a9abfae481fe2fce467a94b6f901789cbd49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fc7c9f84192a4b29d743d951c648a9abfae481fe2fce467a94b6f901789cbd49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc7c9f84192a4b29d743d951c648a9abfae481fe2fce467a94b6f901789cbd49", kill_on_drop: false }`
[INFO] [stdout] fc7c9f84192a4b29d743d951c648a9abfae481fe2fce467a94b6f901789cbd49
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/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] c8ea79ddb084cca7ed0abb0253f621c59eb0417c4de093640f4acad426d7656b
[INFO] running `Command { std: "docker" "start" "-a" "c8ea79ddb084cca7ed0abb0253f621c59eb0417c4de093640f4acad426d7656b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.103
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking any-cache v0.2.3
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking net2 v0.2.37
[INFO] [stderr]     Checking inotify-sys v0.1.5
[INFO] [stderr]     Checking filetime v0.2.15
[INFO] [stderr]     Checking memchr v1.0.2
[INFO] [stderr]     Checking nom v3.2.1
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]     Checking inotify v0.7.1
[INFO] [stderr]     Checking mio-extras v2.0.6
[INFO] [stderr]     Checking glsl v0.9.2
[INFO] [stderr]     Checking notify v4.0.17
[INFO] [stderr]     Checking warmy v0.10.0
[INFO] [stderr]     Checking cheddar v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:257:1
[INFO] [stdout]     |
[INFO] [stdout] 257 | #![feature(box_syntax)]
[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:258:1
[INFO] [stdout]     |
[INFO] [stdout] 258 | #![feature(box_patterns)]
[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:257:1
[INFO] [stdout]     |
[INFO] [stdout] 257 | #![feature(box_syntax)]
[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:258:1
[INFO] [stdout]     |
[INFO] [stdout] 258 | #![feature(box_patterns)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]     --> src/lib.rs:1028:1
[INFO] [stdout]      |
[INFO] [stdout] 1028 | /// Parse a module separator and a module name.
[INFO] [stdout]      | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout]      = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]     --> src/lib.rs:1037:1
[INFO] [stdout]      |
[INFO] [stdout] 1037 | / /// Parse a module path.
[INFO] [stdout] 1038 | | ///
[INFO] [stdout] 1039 | | /// foo
[INFO] [stdout] 1040 | | /// foo.bar
[INFO] [stdout] 1041 | | /// foo.bar.zoo
[INFO] [stdout]      | |_--------------^
[INFO] [stdout]      |   |
[INFO] [stdout]      |   rustdoc does not generate documentation for macro invocations
[INFO] [stdout]      |
[INFO] [stdout]      = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]     --> src/lib.rs:1060:1
[INFO] [stdout]      |
[INFO] [stdout] 1060 | / /// Parse a symbol list.
[INFO] [stdout] 1061 | | ///
[INFO] [stdout] 1062 | | ///     ( item0, item1, item2, …)
[INFO] [stdout]      | |_--------------------------------^
[INFO] [stdout]      |   |
[INFO] [stdout]      |   rustdoc does not generate documentation for macro invocations
[INFO] [stdout]      |
[INFO] [stdout]      = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]     --> src/lib.rs:1028:1
[INFO] [stdout]      |
[INFO] [stdout] 1028 | /// Parse a module separator and a module name.
[INFO] [stdout]      | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout]      = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]     --> src/lib.rs:1037:1
[INFO] [stdout]      |
[INFO] [stdout] 1037 | / /// Parse a module path.
[INFO] [stdout] 1038 | | ///
[INFO] [stdout] 1039 | | /// foo
[INFO] [stdout] 1040 | | /// foo.bar
[INFO] [stdout] 1041 | | /// foo.bar.zoo
[INFO] [stdout]      | |_--------------^
[INFO] [stdout]      |   |
[INFO] [stdout]      |   rustdoc does not generate documentation for macro invocations
[INFO] [stdout]      |
[INFO] [stdout]      = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]     --> src/lib.rs:1060:1
[INFO] [stdout]      |
[INFO] [stdout] 1060 | / /// Parse a symbol list.
[INFO] [stdout] 1061 | | ///
[INFO] [stdout] 1062 | | ///     ( item0, item1, item2, …)
[INFO] [stdout]      | |_--------------------------------^
[INFO] [stdout]      |   |
[INFO] [stdout]      |   rustdoc does not generate documentation for macro invocations
[INFO] [stdout]      |
[INFO] [stdout]      = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]     --> src/lib.rs:1072:1
[INFO] [stdout]      |
[INFO] [stdout] 1072 | /// Parse an import list.
[INFO] [stdout]      | ^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]      |
[INFO] [stdout]      = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]     --> src/lib.rs:1082:1
[INFO] [stdout]      |
[INFO] [stdout] 1082 | /// Parse a module.
[INFO] [stdout]      | ^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]      |
[INFO] [stdout]      = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:759:24
[INFO] [stdout]     |
[INFO] [stdout] 759 |   LoadError(FSKey, Box<Debug>),
[INFO] [stdout]     |                        ^^^^^ help: use `dyn`: `dyn Debug`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[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 issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]     --> src/lib.rs:1072:1
[INFO] [stdout]      |
[INFO] [stdout] 1072 | /// Parse an import list.
[INFO] [stdout]      | ^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]      |
[INFO] [stdout]      = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]     --> src/lib.rs:1082:1
[INFO] [stdout]      |
[INFO] [stdout] 1082 | /// Parse a module.
[INFO] [stdout]      | ^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]      |
[INFO] [stdout]      = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:759:24
[INFO] [stdout]     |
[INFO] [stdout] 759 |   LoadError(FSKey, Box<Debug>),
[INFO] [stdout]     |                        ^^^^^ help: use `dyn`: `dyn Debug`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[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 issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cheddar` due to 3 previous errors; 6 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to 2 previous errors; 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "c8ea79ddb084cca7ed0abb0253f621c59eb0417c4de093640f4acad426d7656b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c8ea79ddb084cca7ed0abb0253f621c59eb0417c4de093640f4acad426d7656b", kill_on_drop: false }`
[INFO] [stdout] c8ea79ddb084cca7ed0abb0253f621c59eb0417c4de093640f4acad426d7656b
