[INFO] fetching crate twenty-first 0.48.0...
[INFO] checking twenty-first-0.48.0 against try#0c7fed2b7584d310ca8221267fa1b3bec4df427f for pr-133502-4
[INFO] extracting crate twenty-first 0.48.0 into /workspace/builds/worker-5-tc2/source
[INFO] validating manifest of crates.io crate twenty-first 0.48.0 on toolchain 0c7fed2b7584d310ca8221267fa1b3bec4df427f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0c7fed2b7584d310ca8221267fa1b3bec4df427f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate twenty-first 0.48.0
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate twenty-first 0.48.0
[INFO] tweaked toml for crates.io crate twenty-first 0.48.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate crates.io crate twenty-first 0.48.0 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" "+0c7fed2b7584d310ca8221267fa1b3bec4df427f" "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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+0c7fed2b7584d310ca8221267fa1b3bec4df427f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1e22fb12d40890a4aa1df32e5bfccfa853436aba0fcd074488f5ccceee926d3a
[INFO] running `Command { std: "docker" "start" "-a" "1e22fb12d40890a4aa1df32e5bfccfa853436aba0fcd074488f5ccceee926d3a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1e22fb12d40890a4aa1df32e5bfccfa853436aba0fcd074488f5ccceee926d3a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e22fb12d40890a4aa1df32e5bfccfa853436aba0fcd074488f5ccceee926d3a", kill_on_drop: false }`
[INFO] [stdout] 1e22fb12d40890a4aa1df32e5bfccfa853436aba0fcd074488f5ccceee926d3a
[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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+0c7fed2b7584d310ca8221267fa1b3bec4df427f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a4599660846858ee8e328eaf087d8561ee4d5b020fdbb93da7e8fcd583169698
[INFO] running `Command { std: "docker" "start" "-a" "a4599660846858ee8e328eaf087d8561ee4d5b020fdbb93da7e8fcd583169698", kill_on_drop: false }`
[INFO] [stderr]    Compiling smallvec v1.13.2
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[INFO] [stderr]     Checking twenty-first v0.48.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]    --> src/math/b_field_element.rs:616:5
[INFO] [stdout]     |
[INFO] [stdout] 616 |     #[must_use]
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]    --> src/math/x_field_element.rs:311:5
[INFO] [stdout]     |
[INFO] [stdout] 311 |     #[must_use]
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking toml v0.8.19
[INFO] [stderr]     Checking trybuild v1.0.101
[INFO] [stderr]     Checking proptest-arbitrary-interop v0.1.0
[INFO] [stdout] warning: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]    --> src/math/b_field_element.rs:616:5
[INFO] [stdout]     |
[INFO] [stdout] 616 |     #[must_use]
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]    --> src/math/x_field_element.rs:311:5
[INFO] [stdout]     |
[INFO] [stdout] 311 |     #[must_use]
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3m 06s
[INFO] running `Command { std: "docker" "inspect" "a4599660846858ee8e328eaf087d8561ee4d5b020fdbb93da7e8fcd583169698", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a4599660846858ee8e328eaf087d8561ee4d5b020fdbb93da7e8fcd583169698", kill_on_drop: false }`
[INFO] [stdout] a4599660846858ee8e328eaf087d8561ee4d5b020fdbb93da7e8fcd583169698