[INFO] crate arc_ast 0.1.0 is already in cache
[INFO] checking arc_ast-0.1.0 against master#6dee5f1126dfd5c9314ee5ae9d9eb010e35ef257 for pr-70872
[INFO] extracting crate arc_ast 0.1.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate arc_ast 0.1.0 on toolchain 6dee5f1126dfd5c9314ee5ae9d9eb010e35ef257
[INFO] running `"/workspace/cargo-home/bin/cargo" "+6dee5f1126dfd5c9314ee5ae9d9eb010e35ef257" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate arc_ast 0.1.0
[INFO] finished tweaking crates.io crate arc_ast 0.1.0
[INFO] tweaked toml for crates.io crate arc_ast 0.1.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+6dee5f1126dfd5c9314ee5ae9d9eb010e35ef257" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+6dee5f1126dfd5c9314ee5ae9d9eb010e35ef257" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+6dee5f1126dfd5c9314ee5ae9d9eb010e35ef257" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 69f6c3ee3b9f541ecb54fb4fcff8d243def6ff8720edbe0400f8b853ac9b3203
[INFO] running `"docker" "start" "-a" "69f6c3ee3b9f541ecb54fb4fcff8d243def6ff8720edbe0400f8b853ac9b3203"`
[INFO] [stderr]     Checking arc_number v0.1.1
[INFO] [stderr]     Checking arc_ast v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `ops::IndexMut`
[INFO] [stderr]  --> src/utils/ast_impl.rs:4:34
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::{collections::VecDeque, ops::IndexMut};
[INFO] [stderr]   |                                  ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Error`
[INFO] [stderr]  --> src/utils/ast_traits.rs:4:33
[INFO] [stderr]   |
[INFO] [stderr] 4 |     fmt::{self, Debug, Display, Error, Formatter},
[INFO] [stderr]   |                                 ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::VecDeque`
[INFO] [stderr]  --> src/lib.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use std::collections::VecDeque;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `ops::IndexMut`
[INFO] [stderr]  --> src/utils/ast_impl.rs:4:34
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::{collections::VecDeque, ops::IndexMut};
[INFO] [stderr]   |                                  ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Error`
[INFO] [stderr]  --> src/utils/ast_traits.rs:4:33
[INFO] [stderr]   |
[INFO] [stderr] 4 |     fmt::{self, Debug, Display, Error, Formatter},
[INFO] [stderr]   |                                 ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::VecDeque`
[INFO] [stderr]  --> src/lib.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use std::collections::VecDeque;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable `length` is assigned to, but never used
[INFO] [stderr]   --> src/utils/ast_traits.rs:71:25
[INFO] [stderr]    |
[INFO] [stderr] 71 |                 let mut length = 0;
[INFO] [stderr]    |                         ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr]    = note: consider using `_length` instead
[INFO] [stderr] 
[INFO] [stderr] warning: variable `length` is assigned to, but never used
[INFO] [stderr]   --> src/utils/ast_traits.rs:71:25
[INFO] [stderr]    |
[INFO] [stderr] 71 |                 let mut length = 0;
[INFO] [stderr]    |                         ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr]    = note: consider using `_length` instead
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.70s
[INFO] running `"docker" "inspect" "69f6c3ee3b9f541ecb54fb4fcff8d243def6ff8720edbe0400f8b853ac9b3203"`
[INFO] running `"docker" "rm" "-f" "69f6c3ee3b9f541ecb54fb4fcff8d243def6ff8720edbe0400f8b853ac9b3203"`
[INFO] [stdout] 69f6c3ee3b9f541ecb54fb4fcff8d243def6ff8720edbe0400f8b853ac9b3203