[INFO] fetching crate pattern-3 0.5.0...
[INFO] testing pattern-3-0.5.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate pattern-3 0.5.0 into /workspace/builds/worker-76/source
[INFO] validating manifest of crates.io crate pattern-3 0.5.0 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 pattern-3 0.5.0
[INFO] finished tweaking crates.io crate pattern-3 0.5.0
[INFO] tweaked toml for crates.io crate pattern-3 0.5.0 written to /workspace/builds/worker-76/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/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] d65b574f70ed599bdc094a762ea26593538885399fde64cc0f6801210be243f2
[INFO] running `Command { std: "docker" "start" "-a" "d65b574f70ed599bdc094a762ea26593538885399fde64cc0f6801210be243f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d65b574f70ed599bdc094a762ea26593538885399fde64cc0f6801210be243f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d65b574f70ed599bdc094a762ea26593538885399fde64cc0f6801210be243f2", kill_on_drop: false }`
[INFO] [stdout] d65b574f70ed599bdc094a762ea26593538885399fde64cc0f6801210be243f2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/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" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 61673b9b23c92ea6372d9924cc096c4e5d08af95f840e7070100e48f62f06095
[INFO] running `Command { std: "docker" "start" "-a" "61673b9b23c92ea6372d9924cc096c4e5d08af95f840e7070100e48f62f06095", kill_on_drop: false }`
[INFO] [stderr]    Compiling pattern-3 v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:1:1
[INFO] [stdout]    |
[INFO] [stdout] 1  | / #![feature(
[INFO] [stdout] 2  | |     specialization,
[INFO] [stdout] 3  | |     // used in two places:
[INFO] [stdout] 4  | |     //  1. to support using the same two-way algorithm for non-Ord slices
[INFO] [stdout] ...  |
[INFO] [stdout] 17 | |     // some useful library features
[INFO] [stdout] 18 | | )]
[INFO] [stdout]    | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]  --> src/lib.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |     specialization,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout]   = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]   = help: consider using `min_specialization` instead, which is more stable and complete
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/omgwtf8/wtf8.rs:193:21
[INFO] [stdout]     |
[INFO] [stdout] 193 |             0xf00000...0xffffffff => {
[INFO] [stdout]     |                     ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` 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: `...` range patterns are deprecated
[INFO] [stdout]    --> src/omgwtf8/wtf8.rs:196:21
[INFO] [stdout]     |
[INFO] [stdout] 196 |             0x800000...0xbfffff => self.0 & 0x3f | self.0 >> 2 & 0x3c0 | 0xdc00,
[INFO] [stdout]     |                     ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[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: `...` range patterns are deprecated
[INFO] [stdout]    --> src/omgwtf8/wtf8.rs:323:31
[INFO] [stdout]     |
[INFO] [stdout] 323 |             ascii_byte @ 0x00 ... 0x7F => ascii_byte,
[INFO] [stdout]     |                               ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[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 previous error; 4 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 `pattern-3` due to 2 previous errors; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "61673b9b23c92ea6372d9924cc096c4e5d08af95f840e7070100e48f62f06095", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "61673b9b23c92ea6372d9924cc096c4e5d08af95f840e7070100e48f62f06095", kill_on_drop: false }`
[INFO] [stdout] 61673b9b23c92ea6372d9924cc096c4e5d08af95f840e7070100e48f62f06095