[INFO] fetching crate list_flattener 0.3.0...
[INFO] checking list_flattener-0.3.0 against master#350d0ef0ec0493e6d21cfb265cb8211a0e74d766 for pr-145342-1
[INFO] extracting crate list_flattener 0.3.0 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate list_flattener 0.3.0
[INFO] finished tweaking crates.io crate list_flattener 0.3.0
[INFO] tweaked toml for crates.io crate list_flattener 0.3.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate list_flattener 0.3.0 on toolchain 350d0ef0ec0493e6d21cfb265cb8211a0e74d766
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate list_flattener 0.3.0 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" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ctor v0.1.13
[INFO] [stderr]   Downloaded parse_int v0.4.0
[INFO] [stderr]   Downloaded syn v1.0.16
[INFO] [stderr]   Downloaded libc v0.2.67
[INFO] [stderr]   Downloaded afl v0.6.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 29ffdac51eb334a7c895a0e6f688132d978e36c9e71098fa5c78a9ab36e66708
[INFO] running `Command { std: "docker" "start" "-a" "29ffdac51eb334a7c895a0e6f688132d978e36c9e71098fa5c78a9ab36e66708", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "29ffdac51eb334a7c895a0e6f688132d978e36c9e71098fa5c78a9ab36e66708", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "29ffdac51eb334a7c895a0e6f688132d978e36c9e71098fa5c78a9ab36e66708", kill_on_drop: false }`
[INFO] [stdout] 29ffdac51eb334a7c895a0e6f688132d978e36c9e71098fa5c78a9ab36e66708
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3ab63d27d579780c1b0dc3b508778908ef27071daa950748dbbc359b5367f7fe
[INFO] running `Command { std: "docker" "start" "-a" "3ab63d27d579780c1b0dc3b508778908ef27071daa950748dbbc359b5367f7fe", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]     Checking difference v2.0.0
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking pretty_assertions v0.6.1
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]     Checking parse_int v0.4.0
[INFO] [stderr]     Checking list_flattener v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/lib.rs:22:38
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn iter<'a>(&'a self) -> Box<(dyn Iterator<Item = isize> + 'a)> {
[INFO] [stdout]    |                                      ^                               ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 22 -     pub fn iter<'a>(&'a self) -> Box<(dyn Iterator<Item = isize> + 'a)> {
[INFO] [stdout] 22 +     pub fn iter<'a>(&'a self) -> Box<dyn Iterator<Item = isize> + 'a> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/lib.rs:22:38
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn iter<'a>(&'a self) -> Box<(dyn Iterator<Item = isize> + 'a)> {
[INFO] [stdout]    |                                      ^                               ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 22 -     pub fn iter<'a>(&'a self) -> Box<(dyn Iterator<Item = isize> + 'a)> {
[INFO] [stdout] 22 +     pub fn iter<'a>(&'a self) -> Box<dyn Iterator<Item = isize> + 'a> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.12s
[INFO] running `Command { std: "docker" "inspect" "3ab63d27d579780c1b0dc3b508778908ef27071daa950748dbbc359b5367f7fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ab63d27d579780c1b0dc3b508778908ef27071daa950748dbbc359b5367f7fe", kill_on_drop: false }`
[INFO] [stdout] 3ab63d27d579780c1b0dc3b508778908ef27071daa950748dbbc359b5367f7fe