[INFO] fetching crate dicetest 0.3.1...
[INFO] checking dicetest-0.3.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate dicetest 0.3.1 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate dicetest 0.3.1 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 crates.io crate dicetest 0.3.1
[INFO] finished tweaking crates.io crate dicetest 0.3.1
[INFO] tweaked toml for crates.io crate dicetest 0.3.1 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 21 packages
[INFO] [stderr]       Adding env_logger v0.7.1 (latest: v0.11.3)
[INFO] [stderr]       Adding getrandom v0.1.16 (latest: v0.2.12)
[INFO] [stderr]       Adding quickcheck v0.9.2 (latest: v1.0.3)
[INFO] [stderr]       Adding rand v0.7.3 (latest: v0.8.5)
[INFO] [stderr]       Adding rand_chacha v0.2.2 (latest: v0.3.1)
[INFO] [stderr]       Adding rand_core v0.5.1 (latest: v0.6.4)
[INFO] [stderr]       Adding rand_hc v0.2.0 (latest: v0.3.2)
[INFO] [stderr]       Adding wasi v0.9.0+wasi-snapshot-preview1 (latest: v0.13.0+wasi-0.2.0)
[INFO] [stderr]       Adding wasi v0.11.0+wasi-snapshot-preview1 (latest: v0.13.0+wasi-0.2.0)
[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 array-init v2.1.0
[INFO] [stderr]   Downloaded quickcheck v0.9.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 60ab42e366ceef3601f9e1cfc40c16cfb17cf09c4e9a34682e9b6ee837f446c5
[INFO] running `Command { std: "docker" "start" "-a" "60ab42e366ceef3601f9e1cfc40c16cfb17cf09c4e9a34682e9b6ee837f446c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "60ab42e366ceef3601f9e1cfc40c16cfb17cf09c4e9a34682e9b6ee837f446c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "60ab42e366ceef3601f9e1cfc40c16cfb17cf09c4e9a34682e9b6ee837f446c5", kill_on_drop: false }`
[INFO] [stdout] 60ab42e366ceef3601f9e1cfc40c16cfb17cf09c4e9a34682e9b6ee837f446c5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 0e79d463867e2abce66a9b569d169649c74ed36c309dada81b4229325e64dcb1
[INFO] running `Command { std: "docker" "start" "-a" "0e79d463867e2abce66a9b569d169649c74ed36c309dada81b4229325e64dcb1", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]     Checking array-init v2.1.0
[INFO] [stderr]     Checking getrandom v0.2.12
[INFO] [stderr]     Checking dicetest v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `RunCode` is imported redundantly
[INFO] [stdout]    --> src/frontend/formatter.rs:355:9
[INFO] [stdout]     |
[INFO] [stdout] 355 |     use crate::frontend::RunCode;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 361 |     use super::*;
[INFO] [stdout]     |         -------- the item `RunCode` is already imported here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Hints` is imported redundantly
[INFO] [stdout]    --> src/frontend/formatter.rs:356:30
[INFO] [stdout]     |
[INFO] [stdout] 356 |     use crate::hints::{Hint, Hints};
[INFO] [stdout]     |                              ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 361 |     use super::*;
[INFO] [stdout]     |         -------- the item `Hints` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `runner` is imported redundantly
[INFO] [stdout]    --> src/frontend/formatter.rs:357:25
[INFO] [stdout]     |
[INFO] [stdout] 357 |     use crate::runner::{self, repeatedly::Counterexample, Error};
[INFO] [stdout]     |                         ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 361 |     use super::*;
[INFO] [stdout]     |         -------- the item `runner` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Counterexample` is imported redundantly
[INFO] [stdout]    --> src/frontend/formatter.rs:357:31
[INFO] [stdout]     |
[INFO] [stdout] 357 |     use crate::runner::{self, repeatedly::Counterexample, Error};
[INFO] [stdout]     |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 361 |     use super::*;
[INFO] [stdout]     |         -------- the item `Counterexample` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Error` is imported redundantly
[INFO] [stdout]    --> src/frontend/formatter.rs:357:59
[INFO] [stdout]     |
[INFO] [stdout] 357 |     use crate::runner::{self, repeatedly::Counterexample, Error};
[INFO] [stdout]     |                                                           ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 361 |     use super::*;
[INFO] [stdout]     |         -------- the item `Error` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Stats` is imported redundantly
[INFO] [stdout]    --> src/frontend/formatter.rs:358:39
[INFO] [stdout]     |
[INFO] [stdout] 358 |     use crate::stats::{Counter, Stat, Stats};
[INFO] [stdout]     |                                       ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 361 |     use super::*;
[INFO] [stdout]     |         -------- the item `Stats` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Limit` is imported redundantly
[INFO] [stdout]    --> src/frontend/formatter.rs:359:17
[INFO] [stdout]     |
[INFO] [stdout] 359 |     use crate::{Limit, Prng};
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout] 360 |
[INFO] [stdout] 361 |     use super::*;
[INFO] [stdout]     |         -------- the item `Limit` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.31s
[INFO] running `Command { std: "docker" "inspect" "0e79d463867e2abce66a9b569d169649c74ed36c309dada81b4229325e64dcb1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0e79d463867e2abce66a9b569d169649c74ed36c309dada81b4229325e64dcb1", kill_on_drop: false }`
[INFO] [stdout] 0e79d463867e2abce66a9b569d169649c74ed36c309dada81b4229325e64dcb1