[INFO] fetching crate buter 1.2.4...
[INFO] testing buter-1.2.4 against 1.75.0 for beta-1.76-1
[INFO] extracting crate buter 1.2.4 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate buter 1.2.4 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] started tweaking crates.io crate buter 1.2.4
[INFO] finished tweaking crates.io crate buter 1.2.4
[INFO] tweaked toml for crates.io crate buter 1.2.4 written to /workspace/builds/worker-7-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] 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" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b252e45dd3885995f798932b79864a29c16720cd1a863fdb0395073b8743b431
[INFO] running `Command { std: "docker" "start" "-a" "b252e45dd3885995f798932b79864a29c16720cd1a863fdb0395073b8743b431", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b252e45dd3885995f798932b79864a29c16720cd1a863fdb0395073b8743b431", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b252e45dd3885995f798932b79864a29c16720cd1a863fdb0395073b8743b431", kill_on_drop: false }`
[INFO] [stdout] b252e45dd3885995f798932b79864a29c16720cd1a863fdb0395073b8743b431
[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=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] 22c252826da34df2e1f69aed38fa0fcee4b2de3f5995ff07f486597e024d8b16
[INFO] running `Command { std: "docker" "start" "-a" "22c252826da34df2e1f69aed38fa0fcee4b2de3f5995ff07f486597e024d8b16", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-queue v0.3.10
[INFO] [stderr]    Compiling buter v1.2.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.29s
[INFO] running `Command { std: "docker" "inspect" "22c252826da34df2e1f69aed38fa0fcee4b2de3f5995ff07f486597e024d8b16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22c252826da34df2e1f69aed38fa0fcee4b2de3f5995ff07f486597e024d8b16", kill_on_drop: false }`
[INFO] [stdout] 22c252826da34df2e1f69aed38fa0fcee4b2de3f5995ff07f486597e024d8b16
[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=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" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0db3accccbd5365764915b2ac4bf23ac68a8c4f60791ebdc44300badc5339be0
[INFO] running `Command { std: "docker" "start" "-a" "0db3accccbd5365764915b2ac4bf23ac68a8c4f60791ebdc44300badc5339be0", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.18
[INFO] [stderr]    Compiling serde v1.0.194
[INFO] [stderr]    Compiling rayon-core v1.12.0
[INFO] [stderr]    Compiling plotters-backend v0.3.5
[INFO] [stderr]    Compiling regex-syntax v0.8.2
[INFO] [stderr]    Compiling num-traits v0.2.17
[INFO] [stderr]    Compiling csv-core v0.1.11
[INFO] [stderr]    Compiling itertools v0.10.5
[INFO] [stderr]    Compiling same-file v1.0.6
[INFO] [stderr]    Compiling half v1.8.2
[INFO] [stderr]    Compiling cast v0.3.0
[INFO] [stderr]    Compiling trybuild v1.0.87
[INFO] [stderr]    Compiling clap v2.34.0
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling oorandom v11.1.3
[INFO] [stderr]    Compiling glob v0.3.1
[INFO] [stderr]    Compiling walkdir v2.4.0
[INFO] [stderr]    Compiling termcolor v1.4.0
[INFO] [stderr]    Compiling plotters-svg v0.3.5
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.17
[INFO] [stderr]    Compiling crossbeam-queue v0.3.10
[INFO] [stderr]    Compiling crossbeam-channel v0.5.10
[INFO] [stderr]    Compiling buter v1.2.4 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling regex-automata v0.4.3
[INFO] [stderr]    Compiling crossbeam-deque v0.8.4
[INFO] [stderr]    Compiling crossbeam v0.8.3
[INFO] [stderr]    Compiling rayon v1.8.0
[INFO] [stderr]    Compiling plotters v0.3.5
[INFO] [stderr]    Compiling criterion-plot v0.4.5
[INFO] [stderr]    Compiling serde_derive v1.0.194
[INFO] [stderr]    Compiling regex v1.10.2
[INFO] [stderr]    Compiling serde_json v1.0.111
[INFO] [stderr]    Compiling serde_cbor v0.11.2
[INFO] [stderr]    Compiling basic-toml v0.1.8
[INFO] [stderr]    Compiling csv v1.3.0
[INFO] [stderr]    Compiling tinytemplate v1.2.1
[INFO] [stderr]    Compiling criterion v0.3.6
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> tests/basic.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(extend_one)]
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> tests/valid_drop.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(extend_one)]
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `buter` (test "valid_drop") due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `buter` (test "basic") due to 2 previous errors
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "0db3accccbd5365764915b2ac4bf23ac68a8c4f60791ebdc44300badc5339be0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0db3accccbd5365764915b2ac4bf23ac68a8c4f60791ebdc44300badc5339be0", kill_on_drop: false }`
[INFO] [stdout] 0db3accccbd5365764915b2ac4bf23ac68a8c4f60791ebdc44300badc5339be0
