[INFO] fetching crate tc-btree 0.8.0...
[INFO] checking tc-btree-0.8.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate tc-btree 0.8.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate tc-btree 0.8.0 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 crates.io crate tc-btree 0.8.0
[INFO] finished tweaking crates.io crate tc-btree 0.8.0
[INFO] tweaked toml for crates.io crate tc-btree 0.8.0 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 102 packages
[INFO] [stderr]       Adding async-hash v0.3.1 (latest: v0.5.3)
[INFO] [stderr]       Adding base64 v0.13.1 (latest: v0.22.0)
[INFO] [stderr]       Adding collate v0.2.4 (latest: v0.4.1)
[INFO] [stderr]       Adding destream v0.5.2 (latest: v0.7.3)
[INFO] [stderr]       Adding email-address-parser v1.0.3 (latest: v2.0.0)
[INFO] [stderr]       Adding generic-array v0.14.7 (latest: v1.0.0)
[INFO] [stderr]       Adding handlebars v4.5.0 (latest: v5.1.2)
[INFO] [stderr]       Adding hr-id v0.2.1 (latest: v0.5.1)
[INFO] [stderr]       Adding num v0.2.1 (latest: v0.4.1)
[INFO] [stderr]       Adding num-bigint v0.2.6 (latest: v0.4.4)
[INFO] [stderr]       Adding num-complex v0.2.4 (latest: v0.4.5)
[INFO] [stderr]       Adding num-derive v0.3.3 (latest: v0.4.2)
[INFO] [stderr]       Adding num-rational v0.2.4 (latest: v0.4.1)
[INFO] [stderr]       Adding number-general v0.8.3 (latest: v0.11.1)
[INFO] [stderr]       Adding object v0.32.2 (latest: v0.34.0)
[INFO] [stderr]       Adding quick-xml v0.18.1 (latest: v0.31.0)
[INFO] [stderr]       Adding safecast v0.1.4 (latest: v0.2.2)
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.58)
[INFO] [stderr]       Adding tbon v0.3.6 (latest: v0.5.2)
[INFO] [stderr]       Adding tc-error v0.7.0 (latest: v0.11.0)
[INFO] [stderr]       Adding tc-transact v0.16.0 (latest: v0.20.0)
[INFO] [stderr]       Adding tc-value v0.8.0 (latest: v0.12.0)
[INFO] [stderr]       Adding tcgeneric v0.6.0 (latest: v0.10.0)
[INFO] [stderr]       Adding txn_lock v0.5.1 (latest: v0.9.0)
[INFO] [stderr]       Adding wasi v0.11.0+wasi-snapshot-preview1 (latest: v0.13.0+wasi-0.2.0)
[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]     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 tc-error v0.7.0
[INFO] [stderr]   Downloaded tcgeneric v0.6.0
[INFO] [stderr]   Downloaded safecast v0.1.4
[INFO] [stderr]   Downloaded txn_lock v0.5.1
[INFO] [stderr]   Downloaded tc-value v0.8.0
[INFO] [stderr]   Downloaded async-hash v0.3.1
[INFO] [stderr]   Downloaded destream v0.5.2
[INFO] [stderr]   Downloaded hr-id v0.2.1
[INFO] [stderr]   Downloaded tc-transact v0.16.0
[INFO] [stderr]   Downloaded handlebars v4.5.0
[INFO] [stderr]   Downloaded tbon v0.3.6
[INFO] [stderr]   Downloaded quick-xml v0.18.1
[INFO] [stderr]   Downloaded email-address-parser v1.0.3
[INFO] [stderr]   Downloaded collate v0.2.4
[INFO] [stderr]   Downloaded number-general v0.8.3
[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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7501fa622cab07768998914703818534bf29a5237d581011c945492bfaac3132
[INFO] running `Command { std: "docker" "start" "-a" "7501fa622cab07768998914703818534bf29a5237d581011c945492bfaac3132", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7501fa622cab07768998914703818534bf29a5237d581011c945492bfaac3132", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7501fa622cab07768998914703818534bf29a5237d581011c945492bfaac3132", kill_on_drop: false }`
[INFO] [stdout] 7501fa622cab07768998914703818534bf29a5237d581011c945492bfaac3132
[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=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] f168dab4038af6b29f6b6ce1c7d1970c61492d4b75398f9e3b0e0e05e12770ec
[INFO] running `Command { std: "docker" "start" "-a" "f168dab4038af6b29f6b6ce1c7d1970c61492d4b75398f9e3b0e0e05e12770ec", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-sink v0.3.30
[INFO] [stderr]     Checking futures-core v0.3.30
[INFO] [stderr]    Compiling syn v2.0.58
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]     Checking uuid v1.8.0
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]     Checking tokio v1.37.0
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]     Checking log v0.4.21
[INFO] [stderr]     Checking futures-channel v0.3.30
[INFO] [stderr]     Checking regex-automata v0.4.6
[INFO] [stderr]     Checking safecast v0.1.4
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking crypto-common v0.1.6
[INFO] [stderr]     Checking block-buffer v0.10.4
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]     Checking collate v0.2.4
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]     Checking sha2 v0.10.8
[INFO] [stderr]     Checking txn_lock v0.5.1
[INFO] [stderr]     Checking regex v1.10.4
[INFO] [stderr]    Compiling num-derive v0.3.3
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.92
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]    Compiling thiserror-impl v1.0.58
[INFO] [stderr]    Compiling serde_derive v1.0.197
[INFO] [stderr]    Compiling async-trait v0.1.79
[INFO] [stderr]    Compiling pin-project-internal v1.1.5
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.92
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.92
[INFO] [stderr]    Compiling thiserror v1.0.58
[INFO] [stderr]     Checking pest v2.7.9
[INFO] [stderr]     Checking pin-project v1.1.5
[INFO] [stderr]     Checking wasm-bindgen v0.2.92
[INFO] [stderr]    Compiling pest_meta v2.7.9
[INFO] [stderr]     Checking console_error_panic_hook v0.1.7
[INFO] [stderr]    Compiling pest_generator v2.7.9
[INFO] [stderr]     Checking serde v1.0.197
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking futures v0.3.30
[INFO] [stderr]     Checking async-hash v0.3.1
[INFO] [stderr]    Compiling pest_derive v2.7.9
[INFO] [stderr]     Checking email-address-parser v1.0.3
[INFO] [stderr]     Checking destream v0.5.2
[INFO] [stderr]     Checking serde_json v1.0.115
[INFO] [stderr]     Checking handlebars v4.5.0
[INFO] [stderr]     Checking hr-id v0.2.1
[INFO] [stderr]     Checking tc-error v0.7.0
[INFO] [stderr]     Checking number-general v0.8.3
[INFO] [stderr]     Checking tbon v0.3.6
[INFO] [stderr]     Checking tcgeneric v0.6.0
[INFO] [stderr]     Checking tc-value v0.8.0
[INFO] [stderr]     Checking tc-transact v0.16.0
[INFO] [stderr]     Checking tc-btree v0.8.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]  --> src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::convert::TryFrom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `TryFrom` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]  --> src/file.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::convert::TryFrom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `TryFrom` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/file.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]  --> src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::convert::TryFrom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `TryFrom` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]  --> src/file.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::convert::TryFrom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `TryFrom` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/file.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 50.58s
[INFO] running `Command { std: "docker" "inspect" "f168dab4038af6b29f6b6ce1c7d1970c61492d4b75398f9e3b0e0e05e12770ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f168dab4038af6b29f6b6ce1c7d1970c61492d4b75398f9e3b0e0e05e12770ec", kill_on_drop: false }`
[INFO] [stdout] f168dab4038af6b29f6b6ce1c7d1970c61492d4b75398f9e3b0e0e05e12770ec