[INFO] cloning repository https://github.com/vimwitch/rstark
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vimwitch/rstark" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvimwitch%2Frstark", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvimwitch%2Frstark'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 66a047eab042bb1f72ecc8f8faef2de43fd29e36
[INFO] checking vimwitch/rstark against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvimwitch%2Frstark" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/vimwitch/rstark 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/vimwitch/rstark
[INFO] removed 0 missing examples
[INFO] finished tweaking git repo https://github.com/vimwitch/rstark
[INFO] tweaked toml for git repo https://github.com/vimwitch/rstark written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/vimwitch/rstark 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]  Downloading crates ...
[INFO] [stderr]   Downloaded blake3 v1.4.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 071f3f3d773e5feeeb2fc25bb4dfd2f5db60b925ae5e79d326a4e3059dedd6fc
[INFO] running `Command { std: "docker" "start" "-a" "071f3f3d773e5feeeb2fc25bb4dfd2f5db60b925ae5e79d326a4e3059dedd6fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "071f3f3d773e5feeeb2fc25bb4dfd2f5db60b925ae5e79d326a4e3059dedd6fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "071f3f3d773e5feeeb2fc25bb4dfd2f5db60b925ae5e79d326a4e3059dedd6fc", kill_on_drop: false }`
[INFO] [stdout] 071f3f3d773e5feeeb2fc25bb4dfd2f5db60b925ae5e79d326a4e3059dedd6fc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 6b4c4fe6adb11a5eacfd0b7954202706431269609f067f340d2bbe00b087f9d3
[INFO] running `Command { std: "docker" "start" "-a" "6b4c4fe6adb11a5eacfd0b7954202706431269609f067f340d2bbe00b087f9d3", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.147
[INFO] [stderr]    Compiling log v0.4.20
[INFO] [stderr]    Compiling serde v1.0.185
[INFO] [stderr]    Compiling syn v2.0.29
[INFO] [stderr]     Checking subtle v2.5.0
[INFO] [stderr]     Checking constant_time_eq v0.3.0
[INFO] [stderr]     Checking arrayvec v0.7.4
[INFO] [stderr]     Checking arrayref v0.3.7
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]     Checking getrandom v0.2.10
[INFO] [stderr]    Compiling cc v1.0.83
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking crypto-bigint v0.5.5
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]    Compiling blake3 v1.4.1
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.87
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.87
[INFO] [stderr]    Compiling serde_derive v1.0.185
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.87
[INFO] [stderr]     Checking wasm-bindgen v0.2.87
[INFO] [stderr]     Checking js-sys v0.3.64
[INFO] [stderr]     Checking serde-wasm-bindgen v0.5.0
[INFO] [stderr]     Checking serde_json v1.0.105
[INFO] [stderr]     Checking rstark v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `U256`, `U64`
[INFO] [stdout]  --> src/field_element.rs:2:31
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crypto_bigint::{Encoding, U256, U128, U64};
[INFO] [stdout]   |                               ^^^^        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `U256`, `U64`
[INFO] [stdout]  --> src/field_element.rs:2:31
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crypto_bigint::{Encoding, U256, U128, U64};
[INFO] [stdout]   |                               ^^^^        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning 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 25.63s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: wasm-bindgen v0.2.87
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 2`
[INFO] running `Command { std: "docker" "inspect" "6b4c4fe6adb11a5eacfd0b7954202706431269609f067f340d2bbe00b087f9d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b4c4fe6adb11a5eacfd0b7954202706431269609f067f340d2bbe00b087f9d3", kill_on_drop: false }`
[INFO] [stdout] 6b4c4fe6adb11a5eacfd0b7954202706431269609f067f340d2bbe00b087f9d3
[INFO] checking vimwitch/rstark against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvimwitch%2Frstark" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/vimwitch/rstark on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/vimwitch/rstark
[INFO] removed 0 missing examples
[INFO] finished tweaking git repo https://github.com/vimwitch/rstark
[INFO] tweaked toml for git repo https://github.com/vimwitch/rstark written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/vimwitch/rstark 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e1b63e39a71d401c32e29ac6bf712352080f639a4db3e34b7eb288e335c29b84
[INFO] running `Command { std: "docker" "start" "-a" "e1b63e39a71d401c32e29ac6bf712352080f639a4db3e34b7eb288e335c29b84", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e1b63e39a71d401c32e29ac6bf712352080f639a4db3e34b7eb288e335c29b84", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1b63e39a71d401c32e29ac6bf712352080f639a4db3e34b7eb288e335c29b84", kill_on_drop: false }`
[INFO] [stdout] e1b63e39a71d401c32e29ac6bf712352080f639a4db3e34b7eb288e335c29b84
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 89d6b4f6bf69a6a300e287980b897df8781723d226e7e2f1f62bfa67c64e2a22
[INFO] running `Command { std: "docker" "start" "-a" "89d6b4f6bf69a6a300e287980b897df8781723d226e7e2f1f62bfa67c64e2a22", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.147
[INFO] [stderr]    Compiling log v0.4.20
[INFO] [stderr]    Compiling serde v1.0.185
[INFO] [stderr]    Compiling syn v2.0.29
[INFO] [stderr]     Checking subtle v2.5.0
[INFO] [stderr]     Checking arrayvec v0.7.4
[INFO] [stderr]     Checking arrayref v0.3.7
[INFO] [stderr]     Checking constant_time_eq v0.3.0
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]    Compiling cc v1.0.83
[INFO] [stderr]     Checking getrandom v0.2.10
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking crypto-bigint v0.5.5
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]    Compiling blake3 v1.4.1
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.87
[INFO] [stderr]    Compiling serde_derive v1.0.185
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.87
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.87
[INFO] [stderr]     Checking wasm-bindgen v0.2.87
[INFO] [stderr]     Checking js-sys v0.3.64
[INFO] [stderr]     Checking serde-wasm-bindgen v0.5.0
[INFO] [stderr]     Checking serde_json v1.0.105
[INFO] [stderr]     Checking rstark v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `U256`, `U64`
[INFO] [stdout]  --> src/field_element.rs:2:31
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crypto_bigint::{Encoding, U256, U128, U64};
[INFO] [stdout]   |                               ^^^^        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `U256`, `U64`
[INFO] [stdout]  --> src/field_element.rs:2:31
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crypto_bigint::{Encoding, U256, U128, U64};
[INFO] [stdout]   |                               ^^^^        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning 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 27.56s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: wasm-bindgen v0.2.87
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 2`
[INFO] running `Command { std: "docker" "inspect" "89d6b4f6bf69a6a300e287980b897df8781723d226e7e2f1f62bfa67c64e2a22", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "89d6b4f6bf69a6a300e287980b897df8781723d226e7e2f1f62bfa67c64e2a22", kill_on_drop: false }`
[INFO] [stdout] 89d6b4f6bf69a6a300e287980b897df8781723d226e7e2f1f62bfa67c64e2a22