[INFO] fetching crate yuck 0.1.0...
[INFO] testing yuck-0.1.0 against 1.75.0 for beta-1.76-1
[INFO] extracting crate yuck 0.1.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate yuck 0.1.0 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-6-tc1/source/rust-toolchain
[INFO] started tweaking crates.io crate yuck 0.1.0
[INFO] finished tweaking crates.io crate yuck 0.1.0
[INFO] tweaked toml for crates.io crate yuck 0.1.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded smart-default v0.6.0
[INFO] [stderr]   Downloaded levenshtein v1.0.5
[INFO] [stderr]   Downloaded eww_shared_util v0.1.0
[INFO] [stderr]   Downloaded simplexpr v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8e0e1888fd005e1a4ad36959be2f09e14dbc1152847bc70f2d17b6c6b25244b4
[INFO] running `Command { std: "docker" "start" "-a" "8e0e1888fd005e1a4ad36959be2f09e14dbc1152847bc70f2d17b6c6b25244b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8e0e1888fd005e1a4ad36959be2f09e14dbc1152847bc70f2d17b6c6b25244b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e0e1888fd005e1a4ad36959be2f09e14dbc1152847bc70f2d17b6c6b25244b4", kill_on_drop: false }`
[INFO] [stdout] 8e0e1888fd005e1a4ad36959be2f09e14dbc1152847bc70f2d17b6c6b25244b4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5236cd4c5fdf21e133a1fef1a3c048506a3734c4165b04afdb90c6c089cd5a6c
[INFO] running `Command { std: "docker" "start" "-a" "5236cd4c5fdf21e133a1fef1a3c048506a3734c4165b04afdb90c6c089cd5a6c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.151
[INFO] [stderr]    Compiling aho-corasick v1.1.2
[INFO] [stderr]    Compiling parking_lot_core v0.9.9
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling regex-syntax v0.8.2
[INFO] [stderr]    Compiling smallvec v1.11.2
[INFO] [stderr]    Compiling lock_api v0.4.11
[INFO] [stderr]    Compiling scopeguard v1.2.0
[INFO] [stderr]    Compiling rustix v0.38.28
[INFO] [stderr]    Compiling siphasher v0.3.11
[INFO] [stderr]    Compiling equivalent v1.0.1
[INFO] [stderr]    Compiling tiny-keccak v2.0.2
[INFO] [stderr]    Compiling hashbrown v0.14.3
[INFO] [stderr]    Compiling phf_shared v0.10.0
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling new_debug_unreachable v1.0.4
[INFO] [stderr]    Compiling fixedbitset v0.4.2
[INFO] [stderr]    Compiling bit-vec v0.6.3
[INFO] [stderr]    Compiling precomputed-hash v0.1.1
[INFO] [stderr]    Compiling ena v0.14.2
[INFO] [stderr]    Compiling bit-set v0.5.3
[INFO] [stderr]    Compiling indexmap v2.1.0
[INFO] [stderr]    Compiling itertools v0.10.5
[INFO] [stderr]    Compiling dirs-sys-next v0.1.2
[INFO] [stderr]    Compiling dirs-next v2.0.0
[INFO] [stderr]    Compiling parking_lot v0.12.1
[INFO] [stderr]    Compiling term v0.7.0
[INFO] [stderr]    Compiling is-terminal v0.4.10
[INFO] [stderr]    Compiling petgraph v0.6.4
[INFO] [stderr]    Compiling unicode-xid v0.2.4
[INFO] [stderr]    Compiling string_cache v0.8.7
[INFO] [stderr]    Compiling ascii-canvas v3.0.0
[INFO] [stderr]    Compiling diff v0.1.13
[INFO] [stderr]    Compiling regex-syntax v0.6.29
[INFO] [stderr]    Compiling ref-cast v1.0.22
[INFO] [stderr]    Compiling regex-automata v0.4.3
[INFO] [stderr]    Compiling unicode-segmentation v1.10.1
[INFO] [stderr]    Compiling serde v1.0.194
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling ref-cast-impl v1.0.22
[INFO] [stderr]    Compiling thiserror-impl v1.0.56
[INFO] [stderr]    Compiling anyhow v1.0.79
[INFO] [stderr]    Compiling termcolor v1.4.0
[INFO] [stderr]    Compiling levenshtein v1.0.5
[INFO] [stderr]    Compiling regex v1.10.2
[INFO] [stderr]    Compiling lalrpop-util v0.19.12
[INFO] [stderr]    Compiling codespan-reporting v0.11.1
[INFO] [stderr]    Compiling thiserror v1.0.56
[INFO] [stderr]    Compiling lalrpop v0.19.12
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]    Compiling serde_json v1.0.111
[INFO] [stderr]    Compiling strum_macros v0.21.1
[INFO] [stderr]    Compiling derive_more v0.99.17
[INFO] [stderr]    Compiling smart-default v0.6.0
[INFO] [stderr]    Compiling strum v0.21.0
[INFO] [stderr]    Compiling eww_shared_util v0.1.0
[INFO] [stderr]    Compiling simplexpr v0.1.0
[INFO] [stderr]    Compiling yuck v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/lib.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(box_syntax)]
[INFO] [stdout]   |            ^^^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: replaced with `#[rustc_box]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `box_syntax` has been removed
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/eval.rs:72:58
[INFO] [stdout]    |
[INFO] [stdout] 72 |             BinOp(span, box a, op, box b) => BinOp(span, box a.try_map_var_refs(f)?, op, box b.try_map_var_refs(f)?),
[INFO] [stdout]    |                                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: use `Box::new()` instead
[INFO] [stdout]    |
[INFO] [stdout] 72 |             BinOp(span, box a, op, box b) => BinOp(span, Box::new(a.try_map_var_refs(f)?), op, box b.try_map_var_refs(f)?),
[INFO] [stdout]    |                                                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `box_syntax` has been removed
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/eval.rs:72:90
[INFO] [stdout]    |
[INFO] [stdout] 72 |             BinOp(span, box a, op, box b) => BinOp(span, box a.try_map_var_refs(f)?, op, box b.try_map_var_refs(f)?),
[INFO] [stdout]    |                                                                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: use `Box::new()` instead
[INFO] [stdout]    |
[INFO] [stdout] 72 |             BinOp(span, box a, op, box b) => BinOp(span, box a.try_map_var_refs(f)?, op, Box::new(b.try_map_var_refs(f)?)),
[INFO] [stdout]    |                                                                                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `box_syntax` has been removed
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/eval.rs:74:59
[INFO] [stdout]    |
[INFO] [stdout] 74 |             UnaryOp(span, op, box a) => UnaryOp(span, op, box a.try_map_var_refs(f)?),
[INFO] [stdout]    |                                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: use `Box::new()` instead
[INFO] [stdout]    |
[INFO] [stdout] 74 |             UnaryOp(span, op, box a) => UnaryOp(span, op, Box::new(a.try_map_var_refs(f)?)),
[INFO] [stdout]    |                                                           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `box_syntax` has been removed
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/eval.rs:76:30
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 IfElse(span, box a.try_map_var_refs(f)?, box b.try_map_var_refs(f)?, box c.try_map_var_refs(f)?)
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: use `Box::new()` instead
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 IfElse(span, Box::new(a.try_map_var_refs(f)?), box b.try_map_var_refs(f)?, box c.try_map_var_refs(f)?)
[INFO] [stdout]    |                              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `box_syntax` has been removed
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/eval.rs:76:58
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 IfElse(span, box a.try_map_var_refs(f)?, box b.try_map_var_refs(f)?, box c.try_map_var_refs(f)?)
[INFO] [stdout]    |                                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: use `Box::new()` instead
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 IfElse(span, box a.try_map_var_refs(f)?, Box::new(b.try_map_var_refs(f)?), box c.try_map_var_refs(f)?)
[INFO] [stdout]    |                                                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `box_syntax` has been removed
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/eval.rs:76:86
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 IfElse(span, box a.try_map_var_refs(f)?, box b.try_map_var_refs(f)?, box c.try_map_var_refs(f)?)
[INFO] [stdout]    |                                                                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: use `Box::new()` instead
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 IfElse(span, box a.try_map_var_refs(f)?, box b.try_map_var_refs(f)?, Box::new(c.try_map_var_refs(f)?))
[INFO] [stdout]    |                                                                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `box_syntax` has been removed
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/eval.rs:78:64
[INFO] [stdout]    |
[INFO] [stdout] 78 |             JsonAccess(span, box a, box b) => JsonAccess(span, box a.try_map_var_refs(f)?, box b.try_map_var_refs(f)?),
[INFO] [stdout]    |                                                                ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: use `Box::new()` instead
[INFO] [stdout]    |
[INFO] [stdout] 78 |             JsonAccess(span, box a, box b) => JsonAccess(span, Box::new(a.try_map_var_refs(f)?), box b.try_map_var_refs(f)?),
[INFO] [stdout]    |                                                                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `box_syntax` has been removed
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/eval.rs:78:92
[INFO] [stdout]    |
[INFO] [stdout] 78 |             JsonAccess(span, box a, box b) => JsonAccess(span, box a.try_map_var_refs(f)?, box b.try_map_var_refs(f)?),
[INFO] [stdout]    |                                                                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: use `Box::new()` instead
[INFO] [stdout]    |
[INFO] [stdout] 78 |             JsonAccess(span, box a, box b) => JsonAccess(span, box a.try_map_var_refs(f)?, Box::new(b.try_map_var_refs(f)?)),
[INFO] [stdout]    |                                                                                            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![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]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(pattern)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![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]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(try_blocks)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(unwrap_infallible)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(never_type)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/lib.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(once_cell)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(pattern)]
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/lib.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(unwrap_infallible)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/simplexpr-0.1.0/src/lib.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(once_cell)]
[INFO] [stdout]   |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 19 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `simplexpr` (lib) due to 20 previous errors
[INFO] running `Command { std: "docker" "inspect" "5236cd4c5fdf21e133a1fef1a3c048506a3734c4165b04afdb90c6c089cd5a6c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5236cd4c5fdf21e133a1fef1a3c048506a3734c4165b04afdb90c6c089cd5a6c", kill_on_drop: false }`
[INFO] [stdout] 5236cd4c5fdf21e133a1fef1a3c048506a3734c4165b04afdb90c6c089cd5a6c
