[INFO] fetching crate polynomial-roots 1.0.0...
[INFO] building polynomial-roots-1.0.0 against try#d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6 for pr-146237-1
[INFO] extracting crate polynomial-roots 1.0.0 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate polynomial-roots 1.0.0
[INFO] finished tweaking crates.io crate polynomial-roots 1.0.0
[INFO] tweaked toml for crates.io crate polynomial-roots 1.0.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate polynomial-roots 1.0.0 on toolchain d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate polynomial-roots 1.0.0 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" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4ee7f04cb641cc72ea54aafd5bd510bb4d0ed85be5697d9b4decc401d9983b2b
[INFO] running `Command { std: "docker" "start" "-a" "4ee7f04cb641cc72ea54aafd5bd510bb4d0ed85be5697d9b4decc401d9983b2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4ee7f04cb641cc72ea54aafd5bd510bb4d0ed85be5697d9b4decc401d9983b2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ee7f04cb641cc72ea54aafd5bd510bb4d0ed85be5697d9b4decc401d9983b2b", kill_on_drop: false }`
[INFO] [stdout] 4ee7f04cb641cc72ea54aafd5bd510bb4d0ed85be5697d9b4decc401d9983b2b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8b0a4eb2a416064fba402c90df8eed5582bea74da5bdd57049b806af85cc4615
[INFO] running `Command { std: "docker" "start" "-a" "8b0a4eb2a416064fba402c90df8eed5582bea74da5bdd57049b806af85cc4615", kill_on_drop: false }`
[INFO] [stderr]    Compiling polynomial-roots v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/polynomials.rs:48:5
[INFO] [stdout]    |
[INFO] [stdout] 48 |     &self,
[INFO] [stdout]    |     ^^^^^ the lifetime is elided here
[INFO] [stdout] 49 |   ) -> std::collections::linked_list::Iter<f32> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 49 |   ) -> std::collections::linked_list::Iter<'_, f32> {
[INFO] [stdout]    |                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.94s
[INFO] running `Command { std: "docker" "inspect" "8b0a4eb2a416064fba402c90df8eed5582bea74da5bdd57049b806af85cc4615", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b0a4eb2a416064fba402c90df8eed5582bea74da5bdd57049b806af85cc4615", kill_on_drop: false }`
[INFO] [stdout] 8b0a4eb2a416064fba402c90df8eed5582bea74da5bdd57049b806af85cc4615
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 437a26555d56465d7af71bbbb60f273d49057c37e7b1b4a215d301c94b7867af
[INFO] running `Command { std: "docker" "start" "-a" "437a26555d56465d7af71bbbb60f273d49057c37e7b1b4a215d301c94b7867af", kill_on_drop: false }`
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/polynomials.rs:48:5
[INFO] [stdout]    |
[INFO] [stdout] 48 |     &self,
[INFO] [stdout]    |     ^^^^^ the lifetime is elided here
[INFO] [stdout] 49 |   ) -> std::collections::linked_list::Iter<f32> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 49 |   ) -> std::collections::linked_list::Iter<'_, f32> {
[INFO] [stdout]    |                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling polynomial-roots v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/polynomials.rs:48:5
[INFO] [stdout]    |
[INFO] [stdout] 48 |     &self,
[INFO] [stdout]    |     ^^^^^ the lifetime is elided here
[INFO] [stdout] 49 |   ) -> std::collections::linked_list::Iter<f32> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 49 |   ) -> std::collections::linked_list::Iter<'_, f32> {
[INFO] [stdout]    |                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.62s
[INFO] running `Command { std: "docker" "inspect" "437a26555d56465d7af71bbbb60f273d49057c37e7b1b4a215d301c94b7867af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "437a26555d56465d7af71bbbb60f273d49057c37e7b1b4a215d301c94b7867af", kill_on_drop: false }`
[INFO] [stdout] 437a26555d56465d7af71bbbb60f273d49057c37e7b1b4a215d301c94b7867af