[INFO] fetching crate rivia 0.2.6...
[INFO] checking rivia-0.2.6 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate rivia 0.2.6 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate rivia 0.2.6 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 rivia 0.2.6
[INFO] finished tweaking crates.io crate rivia 0.2.6
[INFO] tweaked toml for crates.io crate rivia 0.2.6 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate crates.io crate rivia 0.2.6 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 libc v0.2.108
[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] 7d21cd4f0b15de4696eb1de1e1ddb32db2eb27ba35aac7b5b2980d0ef92a3ee9
[INFO] running `Command { std: "docker" "start" "-a" "7d21cd4f0b15de4696eb1de1e1ddb32db2eb27ba35aac7b5b2980d0ef92a3ee9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7d21cd4f0b15de4696eb1de1e1ddb32db2eb27ba35aac7b5b2980d0ef92a3ee9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d21cd4f0b15de4696eb1de1e1ddb32db2eb27ba35aac7b5b2980d0ef92a3ee9", kill_on_drop: false }`
[INFO] [stdout] 7d21cd4f0b15de4696eb1de1e1ddb32db2eb27ba35aac7b5b2980d0ef92a3ee9
[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] 9196811dba351cd7cf376955c9724242e1987914dc0e2466b47729800572e276
[INFO] running `Command { std: "docker" "start" "-a" "9196811dba351cd7cf376955c9724242e1987914dc0e2466b47729800572e276", kill_on_drop: false }`
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]     Checking itertools v0.10.3
[INFO] [stderr]     Checking nix v0.23.1
[INFO] [stderr]     Checking rivia v0.2.6 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Iterator` is imported redundantly
[INFO] [stdout]  --> src/core/iter.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{fmt, iter::Iterator};
[INFO] [stdout]   |                ^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Iterator` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `result::*`
[INFO] [stdout]   --> src/core/mod.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub use result::*;
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `trying` is imported redundantly
[INFO] [stdout]    --> src/sys/fs/entries.rs:7:5
[INFO] [stdout]     |
[INFO] [stdout] 7   |       trying,
[INFO] [stdout]     |       ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/core/mod.rs:170:1
[INFO] [stdout]     |
[INFO] [stdout] 170 | / macro_rules! trying {
[INFO] [stdout] 171 | |     ($e:expr) => {
[INFO] [stdout] 172 | |         match $e {
[INFO] [stdout] 173 | |             Ok(v) => v,
[INFO] [stdout] ...   |
[INFO] [stdout] 176 | |     };
[INFO] [stdout] 177 | | }
[INFO] [stdout]     | |_- the item `trying` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `trying` is imported redundantly
[INFO] [stdout]    --> src/sys/fs/stdfs/entry.rs:11:5
[INFO] [stdout]     |
[INFO] [stdout] 11  |       trying,
[INFO] [stdout]     |       ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/core/mod.rs:170:1
[INFO] [stdout]     |
[INFO] [stdout] 170 | / macro_rules! trying {
[INFO] [stdout] 171 | |     ($e:expr) => {
[INFO] [stdout] 172 | |         match $e {
[INFO] [stdout] 173 | |             Ok(v) => v,
[INFO] [stdout] ...   |
[INFO] [stdout] 176 | |     };
[INFO] [stdout] 177 | | }
[INFO] [stdout]     | |_- the item `trying` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Iterator` is imported redundantly
[INFO] [stdout]  --> src/core/iter.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{fmt, iter::Iterator};
[INFO] [stdout]   |                ^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Iterator` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Component` is imported redundantly
[INFO] [stdout]    --> src/core/string.rs:180:16
[INFO] [stdout]     |
[INFO] [stdout] 180 |         path::{Component, Path, PathBuf},
[INFO] [stdout]     |                ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 183 |     use crate::prelude::*;
[INFO] [stdout]     |         ----------------- the item `Component` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Path` is imported redundantly
[INFO] [stdout]    --> src/core/string.rs:180:27
[INFO] [stdout]     |
[INFO] [stdout] 180 |         path::{Component, Path, PathBuf},
[INFO] [stdout]     |                           ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 183 |     use crate::prelude::*;
[INFO] [stdout]     |         ----------------- the item `Path` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `PathBuf` is imported redundantly
[INFO] [stdout]    --> src/core/string.rs:180:33
[INFO] [stdout]     |
[INFO] [stdout] 180 |         path::{Component, Path, PathBuf},
[INFO] [stdout]     |                                 ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 183 |     use crate::prelude::*;
[INFO] [stdout]     |         ----------------- the item `PathBuf` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `result::*`
[INFO] [stdout]   --> src/core/mod.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub use result::*;
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `trying` is imported redundantly
[INFO] [stdout]    --> src/sys/fs/entries.rs:7:5
[INFO] [stdout]     |
[INFO] [stdout] 7   |       trying,
[INFO] [stdout]     |       ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/core/mod.rs:170:1
[INFO] [stdout]     |
[INFO] [stdout] 170 | / macro_rules! trying {
[INFO] [stdout] 171 | |     ($e:expr) => {
[INFO] [stdout] 172 | |         match $e {
[INFO] [stdout] 173 | |             Ok(v) => v,
[INFO] [stdout] ...   |
[INFO] [stdout] 176 | |     };
[INFO] [stdout] 177 | | }
[INFO] [stdout]     | |_- the item `trying` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Arc` is imported redundantly
[INFO] [stdout]     --> src/sys/fs/memfs/vfs.rs:2159:15
[INFO] [stdout]      |
[INFO] [stdout] 2159 |     use std::{sync::Arc, thread, time::Duration};
[INFO] [stdout]      |               ^^^^^^^^^
[INFO] [stdout] 2160 |
[INFO] [stdout] 2161 |     use crate::prelude::*;
[INFO] [stdout]      |         ----------------- the item `Arc` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `trying` is imported redundantly
[INFO] [stdout]    --> src/sys/fs/stdfs/entry.rs:11:5
[INFO] [stdout]     |
[INFO] [stdout] 11  |       trying,
[INFO] [stdout]     |       ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/core/mod.rs:170:1
[INFO] [stdout]     |
[INFO] [stdout] 170 | / macro_rules! trying {
[INFO] [stdout] 171 | |     ($e:expr) => {
[INFO] [stdout] 172 | |         match $e {
[INFO] [stdout] 173 | |             Ok(v) => v,
[INFO] [stdout] ...   |
[INFO] [stdout] 176 | |     };
[INFO] [stdout] 177 | | }
[INFO] [stdout]     | |_- the item `trying` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `PathBuf` is imported redundantly
[INFO] [stdout]    --> src/sys/user.rs:533:20
[INFO] [stdout]     |
[INFO] [stdout] 533 |     use std::{env, path::PathBuf};
[INFO] [stdout]     |                    ^^^^^^^^^^^^^
[INFO] [stdout] 534 |
[INFO] [stdout] 535 |     use crate::prelude::*;
[INFO] [stdout]     |         ----------------- the item `PathBuf` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.46s
[INFO] running `Command { std: "docker" "inspect" "9196811dba351cd7cf376955c9724242e1987914dc0e2466b47729800572e276", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9196811dba351cd7cf376955c9724242e1987914dc0e2466b47729800572e276", kill_on_drop: false }`
[INFO] [stdout] 9196811dba351cd7cf376955c9724242e1987914dc0e2466b47729800572e276