[INFO] cloning repository https://github.com/ethersync/automerge-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ethersync/automerge-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fethersync%2Fautomerge-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fethersync%2Fautomerge-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 43f07a3874613e93619cd8b8b7076dd659272adf
[INFO] checking ethersync/automerge-playground against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fethersync%2Fautomerge-playground" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ethersync/automerge-playground on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ethersync/automerge-playground
[INFO] finished tweaking git repo https://github.com/ethersync/automerge-playground
[INFO] tweaked toml for git repo https://github.com/ethersync/automerge-playground written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/ethersync/automerge-playground 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded derive_arbitrary v1.3.2
[INFO] [stderr]   Downloaded rle v0.2.0
[INFO] [stderr]   Downloaded kyte v0.1.0
[INFO] [stderr]   Downloaded str_indices v0.3.2
[INFO] [stderr]   Downloaded operational-transform v0.6.1
[INFO] [stderr]   Downloaded autosurgeon-derive v0.8.0
[INFO] [stderr]   Downloaded y-sync v0.4.0
[INFO] [stderr]   Downloaded jumprope v1.1.2
[INFO] [stderr]   Downloaded similar v2.4.0
[INFO] [stderr]   Downloaded automerge v0.5.7
[INFO] [stderr]   Downloaded diamond-types v1.0.0
[INFO] [stderr]   Downloaded autosurgeon v0.8.3
[INFO] [stderr]   Downloaded content-tree v0.2.0
[INFO] [stderr]   Downloaded lz4_flex v0.9.5
[INFO] [stderr]   Downloaded yrs v0.17.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e028b59dd53ec7ef9d4d5874ca50848412ee9dbdca6695dc6803b007164920e7
[INFO] running `Command { std: "docker" "start" "-a" "e028b59dd53ec7ef9d4d5874ca50848412ee9dbdca6695dc6803b007164920e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e028b59dd53ec7ef9d4d5874ca50848412ee9dbdca6695dc6803b007164920e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e028b59dd53ec7ef9d4d5874ca50848412ee9dbdca6695dc6803b007164920e7", kill_on_drop: false }`
[INFO] [stdout] e028b59dd53ec7ef9d4d5874ca50848412ee9dbdca6695dc6803b007164920e7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f1eaa3880106a8599fb1a42192bd421dd2dd422d855a3a184d23b036cc559eb2
[INFO] running `Command { std: "docker" "start" "-a" "f1eaa3880106a8599fb1a42192bd421dd2dd422d855a3a184d23b036cc559eb2", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.78
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]    Compiling serde v1.0.196
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling thiserror v1.0.56
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling equivalent v1.0.1
[INFO] [stderr]    Compiling hashbrown v0.14.3
[INFO] [stderr]     Checking smallvec v1.13.1
[INFO] [stderr]    Compiling winnow v0.5.40
[INFO] [stderr]    Compiling toml_datetime v0.6.5
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling crc32fast v1.3.2
[INFO] [stderr]    Compiling autocfg v1.2.0
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking once_cell v1.19.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]    Compiling serde_json v1.0.113
[INFO] [stderr]     Checking miniz_oxide v0.7.2
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]    Compiling im v15.1.0
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]     Checking tracing-core v0.1.32
[INFO] [stderr]     Checking tinyvec_macros v0.1.1
[INFO] [stderr]     Checking ryu v1.0.16
[INFO] [stderr]     Checking pin-project-lite v0.2.13
[INFO] [stderr]     Checking byteorder v1.5.0
[INFO] [stderr]     Checking unicode-segmentation v1.10.1
[INFO] [stderr]    Compiling smartstring v1.0.1
[INFO] [stderr]     Checking memchr v2.7.1
[INFO] [stderr]     Checking cpufeatures v0.2.12
[INFO] [stderr]     Checking either v1.9.0
[INFO] [stderr]     Checking itoa v1.0.10
[INFO] [stderr]     Checking flate2 v1.0.28
[INFO] [stderr]     Checking tinyvec v1.6.0
[INFO] [stderr]     Checking twox-hash v1.6.3
[INFO] [stderr]     Checking itertools v0.12.1
[INFO] [stderr]     Checking rle v0.2.0
[INFO] [stderr]     Checking smallstr v0.3.0
[INFO] [stderr]    Compiling indexmap v2.2.6
[INFO] [stderr]     Checking fxhash v0.2.1
[INFO] [stderr]     Checking leb128 v0.2.5
[INFO] [stderr]     Checking crc-catalog v1.1.1
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]     Checking humansize v1.1.1
[INFO] [stderr]     Checking str_indices v0.4.3
[INFO] [stderr]     Checking atomic_refcell v0.1.13
[INFO] [stderr]     Checking lz4_flex v0.9.5
[INFO] [stderr]     Checking crc v2.1.0
[INFO] [stderr]     Checking str_indices v0.3.2
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking bytecount v0.6.7
[INFO] [stderr]     Checking content-tree v0.2.0
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]     Checking operational-transform v0.6.1
[INFO] [stderr]     Checking getrandom v0.2.12
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]     Checking similar v2.4.0
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking bitmaps v2.1.0
[INFO] [stderr]     Checking rand_xoshiro v0.6.0
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking sized-chunks v0.6.5
[INFO] [stderr]     Checking crypto-common v0.1.6
[INFO] [stderr]     Checking block-buffer v0.10.4
[INFO] [stderr]    Compiling toml_edit v0.19.15
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]     Checking sha2 v0.10.8
[INFO] [stderr]     Checking jumprope v1.1.2
[INFO] [stderr]    Compiling proc-macro-crate v1.3.1
[INFO] [stderr]    Compiling num_enum_derive v0.5.11
[INFO] [stderr]    Compiling serde_derive v1.0.196
[INFO] [stderr]    Compiling thiserror-impl v1.0.56
[INFO] [stderr]    Compiling tracing-attributes v0.1.27
[INFO] [stderr]    Compiling derive_arbitrary v1.3.2
[INFO] [stderr]     Checking num_enum v0.5.11
[INFO] [stderr]     Checking diamond-types v1.0.0
[INFO] [stderr]     Checking arbitrary v1.3.2
[INFO] [stderr]     Checking tracing v0.1.40
[INFO] [stderr]    Compiling autosurgeon-derive v0.8.0
[INFO] [stderr]     Checking uuid v1.7.0
[INFO] [stderr]     Checking smol_str v0.2.1
[INFO] [stderr]     Checking kyte v0.1.0
[INFO] [stderr]     Checking automerge v0.5.7
[INFO] [stderr]     Checking yrs v0.17.4
[INFO] [stderr]     Checking y-sync v0.4.0
[INFO] [stderr]     Checking autosurgeon v0.8.3
[INFO] [stderr]     Checking hello-automerge v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> src/bin/ot.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let s = "";
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/bin/ot.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let mut b = OperationSeq::from_iter([Retain(2), Insert("🥕".to_owned())]);
[INFO] [stdout]   |         ----^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `y_sync_example` is never used
[INFO] [stdout]   --> src/bin/y.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn y_sync_example() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> src/bin/ot.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let s = "";
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/bin/ot.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let mut b = OperationSeq::from_iter([Retain(2), Insert("🥕".to_owned())]);
[INFO] [stdout]   |         ----^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `y_sync_example` is never used
[INFO] [stdout]   --> src/bin/y.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn y_sync_example() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 21.70s
[INFO] running `Command { std: "docker" "inspect" "f1eaa3880106a8599fb1a42192bd421dd2dd422d855a3a184d23b036cc559eb2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f1eaa3880106a8599fb1a42192bd421dd2dd422d855a3a184d23b036cc559eb2", kill_on_drop: false }`
[INFO] [stdout] f1eaa3880106a8599fb1a42192bd421dd2dd422d855a3a184d23b036cc559eb2