[INFO] fetching crate mako_infinite_shuffle 0.4.2...
[INFO] checking mako_infinite_shuffle-0.4.2 against try#93086cfebfccb79083c59d0d3b2052944bba643c for pr-146440-1
[INFO] extracting crate mako_infinite_shuffle 0.4.2 into /workspace/builds/worker-3-tc2/source
[INFO] started tweaking crates.io crate mako_infinite_shuffle 0.4.2
[INFO] finished tweaking crates.io crate mako_infinite_shuffle 0.4.2
[INFO] tweaked toml for crates.io crate mako_infinite_shuffle 0.4.2 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate mako_infinite_shuffle 0.4.2 on toolchain 93086cfebfccb79083c59d0d3b2052944bba643c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate mako_infinite_shuffle 0.4.2 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" "+93086cfebfccb79083c59d0d3b2052944bba643c" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded number-encoding v0.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a296ffa55413f0c6d167584716b5b65133421e6bfe373d9b4714861b8f02554c
[INFO] running `Command { std: "docker" "start" "-a" "a296ffa55413f0c6d167584716b5b65133421e6bfe373d9b4714861b8f02554c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a296ffa55413f0c6d167584716b5b65133421e6bfe373d9b4714861b8f02554c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a296ffa55413f0c6d167584716b5b65133421e6bfe373d9b4714861b8f02554c", kill_on_drop: false }`
[INFO] [stdout] a296ffa55413f0c6d167584716b5b65133421e6bfe373d9b4714861b8f02554c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 41b6fa9a47c6c5aafee4e904a210d8f29e9b75175736200be9c3d2deda7ce1f4
[INFO] running `Command { std: "docker" "start" "-a" "41b6fa9a47c6c5aafee4e904a210d8f29e9b75175736200be9c3d2deda7ce1f4", kill_on_drop: false }`
[INFO] [stderr]     Checking number-encoding v0.2.1
[INFO] [stderr]     Checking mako_infinite_shuffle v0.4.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `isqrt` has been stable since 1.84.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(isqrt)]
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `isqrt` has been stable since 1.84.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(isqrt)]
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `Series` is never constructed
[INFO] [stdout]    --> src/lib.rs:206:12
[INFO] [stdout]     |
[INFO] [stdout] 206 | pub struct Series<A, B>(A, B);
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout]     = note: `#[deny(unused_unconstructable_pub_structs)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mako_infinite_shuffle` (lib) due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: struct `Series` is never constructed
[INFO] [stdout]    --> src/lib.rs:206:12
[INFO] [stdout]     |
[INFO] [stdout] 206 | pub struct Series<A, B>(A, B);
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout]     = note: `#[deny(unused_unconstructable_pub_structs)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mako_infinite_shuffle` (lib test) due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "41b6fa9a47c6c5aafee4e904a210d8f29e9b75175736200be9c3d2deda7ce1f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "41b6fa9a47c6c5aafee4e904a210d8f29e9b75175736200be9c3d2deda7ce1f4", kill_on_drop: false }`
[INFO] [stdout] 41b6fa9a47c6c5aafee4e904a210d8f29e9b75175736200be9c3d2deda7ce1f4