[INFO] fetching crate mdbook 0.4.36...
[INFO] checking mdbook-0.4.36 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate mdbook 0.4.36 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate mdbook 0.4.36 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 mdbook 0.4.36
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate mdbook 0.4.36
[INFO] tweaked toml for crates.io crate mdbook 0.4.36 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate crates.io crate mdbook 0.4.36 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 }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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 }`
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[INFO] running `Command { std: "docker" "start" "-a" "a40dea8878162524d2308302e97c1f30e81a9b2d4f7eee534877d0ae0ef30bdb", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "6c4f0210822d44904a1fa7754bd7ca6935dfff6c79bcb85f89e09a925af3bae8", kill_on_drop: false }`
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[INFO] [stdout] warning: the item `memchr` is imported redundantly
[INFO] [stdout]  --> src/book/summary.rs:3:14
[INFO] [stdout]   |
[INFO] [stdout] 3 | use memchr::{self, Memchr};
[INFO] [stdout]   |              ^^^^ the item `memchr` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `pulldown_cmark` is imported redundantly
[INFO] [stdout]  --> src/book/summary.rs:4:22
[INFO] [stdout]   |
[INFO] [stdout] 4 | use pulldown_cmark::{self, Event, HeadingLevel, Tag};
[INFO] [stdout]   |                      ^^^^ the item `pulldown_cmark` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/book/summary.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `ToString` is imported redundantly
[INFO] [stdout]   --> src/book/mod.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use std::string::ToString;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:144:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `ToString` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `toml` is imported redundantly
[INFO] [stdout]   --> src/config.rs:61:12
[INFO] [stdout]    |
[INFO] [stdout] 61 | use toml::{self, Value};
[INFO] [stdout]    |            ^^^^ the item `toml` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Into` is imported redundantly
[INFO] [stdout]  --> src/utils/fs.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::convert::Into;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Into` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Write` is imported redundantly
[INFO] [stdout]    --> src/book/book.rs:342:9
[INFO] [stdout]     |
[INFO] [stdout] 341 |     use super::*;
[INFO] [stdout]     |         -------- the item `Write` is already imported here
[INFO] [stdout] 342 |     use std::io::Write;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `memchr` is imported redundantly
[INFO] [stdout]  --> src/book/summary.rs:3:14
[INFO] [stdout]   |
[INFO] [stdout] 3 | use memchr::{self, Memchr};
[INFO] [stdout]   |              ^^^^ the item `memchr` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/book/summary.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `ToString` is imported redundantly
[INFO] [stdout]   --> src/book/mod.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use std::string::ToString;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:144:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `ToString` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Value` is imported redundantly
[INFO] [stdout]    --> src/book/mod.rs:608:30
[INFO] [stdout]     |
[INFO] [stdout] 606 |     use super::*;
[INFO] [stdout]     |         -------- the item `Value` is already imported here
[INFO] [stdout] 607 |     use std::str::FromStr;
[INFO] [stdout] 608 |     use toml::value::{Table, Value};
[INFO] [stdout]     |                              ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `toml` is imported redundantly
[INFO] [stdout]   --> src/config.rs:61:12
[INFO] [stdout]    |
[INFO] [stdout] 61 | use toml::{self, Value};
[INFO] [stdout]    |            ^^^^ the item `toml` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `PathBuf` is imported redundantly
[INFO] [stdout]    --> src/theme/mod.rs:215:9
[INFO] [stdout]     |
[INFO] [stdout] 213 |     use super::*;
[INFO] [stdout]     |         -------- the item `PathBuf` is already imported here
[INFO] [stdout] 214 |     use std::fs;
[INFO] [stdout] 215 |     use std::path::PathBuf;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Into` is imported redundantly
[INFO] [stdout]  --> src/utils/fs.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::convert::Into;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Into` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Arg` is imported redundantly
[INFO] [stdout]  --> src/cmd/test.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::command_prelude::*;
[INFO] [stdout]   |     ------------------------- the item `Arg` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 4 | use clap::{Arg, ArgAction, ArgMatches, Command};
[INFO] [stdout]   |            ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `ArgMatches` is imported redundantly
[INFO] [stdout]  --> src/cmd/test.rs:4:28
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::command_prelude::*;
[INFO] [stdout]   |     ------------------------- the item `ArgMatches` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 4 | use clap::{Arg, ArgAction, ArgMatches, Command};
[INFO] [stdout]   |                            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Command` is imported redundantly
[INFO] [stdout]  --> src/cmd/test.rs:4:40
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::command_prelude::*;
[INFO] [stdout]   |     ------------------------- the item `Command` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 4 | use clap::{Arg, ArgAction, ArgMatches, Command};
[INFO] [stdout]   |                                        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Arg` is imported redundantly
[INFO] [stdout]  --> src/cmd/test.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::command_prelude::*;
[INFO] [stdout]   |     ------------------------- the item `Arg` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 4 | use clap::{Arg, ArgAction, ArgMatches, Command};
[INFO] [stdout]   |            ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `ArgMatches` is imported redundantly
[INFO] [stdout]  --> src/cmd/test.rs:4:28
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::command_prelude::*;
[INFO] [stdout]   |     ------------------------- the item `ArgMatches` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 4 | use clap::{Arg, ArgAction, ArgMatches, Command};
[INFO] [stdout]   |                            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Command` is imported redundantly
[INFO] [stdout]  --> src/cmd/test.rs:4:40
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::command_prelude::*;
[INFO] [stdout]   |     ------------------------- the item `Command` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 4 | use clap::{Arg, ArgAction, ArgMatches, Command};
[INFO] [stdout]   |                                        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 49.61s
[INFO] running `Command { std: "docker" "inspect" "6c4f0210822d44904a1fa7754bd7ca6935dfff6c79bcb85f89e09a925af3bae8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6c4f0210822d44904a1fa7754bd7ca6935dfff6c79bcb85f89e09a925af3bae8", kill_on_drop: false }`
[INFO] [stdout] 6c4f0210822d44904a1fa7754bd7ca6935dfff6c79bcb85f89e09a925af3bae8