[INFO] updating cached repository davidbarsky/trace-prototype
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/davidbarsky/trace-prototype
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/davidbarsky/trace-prototype" "work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/davidbarsky/trace-prototype"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/davidbarsky/trace-prototype'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/davidbarsky/trace-prototype" "work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/davidbarsky/trace-prototype"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/davidbarsky/trace-prototype'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b14cbdf110c04525d9516a718e4b8b0449b9bfdb
[INFO] sha for GitHub repo davidbarsky/trace-prototype: b14cbdf110c04525d9516a718e4b8b0449b9bfdb
[INFO] validating manifest of davidbarsky/trace-prototype on toolchain master#60960a260f7b5c695fd0717311d72ce62dd4eb43
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of davidbarsky/trace-prototype on toolchain try#266783e4e09e4e9d5307c1c8e695659c58bbcac7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing davidbarsky/trace-prototype
[INFO] finished frobbing davidbarsky/trace-prototype
[INFO] frobbed toml for davidbarsky/trace-prototype written to work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/davidbarsky/trace-prototype/Cargo.toml
[INFO] started frobbing davidbarsky/trace-prototype
[INFO] finished frobbing davidbarsky/trace-prototype
[INFO] frobbed toml for davidbarsky/trace-prototype written to work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/davidbarsky/trace-prototype/Cargo.toml
[INFO] crate davidbarsky/trace-prototype already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] checking davidbarsky/trace-prototype against master#60960a260f7b5c695fd0717311d72ce62dd4eb43 for pr-63376
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63376/worker-7/master#60960a260f7b5c695fd0717311d72ce62dd4eb43:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/davidbarsky/trace-prototype:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 59c9058dfd767e2b6aeb5f70711abd4d6558a829502d9f1aca136431f2520e73
[INFO] running `"docker" "start" "-a" "59c9058dfd767e2b6aeb5f70711abd4d6558a829502d9f1aca136431f2520e73"`
[INFO] [stderr] warning: the cargo feature `edition` is now stable and is no longer necessary to be listed in the manifest
[INFO] [stderr]    Compiling cc v1.0.22
[INFO] [stderr]    Compiling quote v0.6.8
[INFO] [stderr]     Checking parking_lot_core v0.2.14
[INFO] [stderr]     Checking crossbeam-deque v0.5.2
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]     Checking parking_lot v0.6.3
[INFO] [stderr]     Checking crossbeam-channel v0.2.4
[INFO] [stderr]     Checking crossbeam v0.4.1
[INFO] [stderr]    Compiling backtrace-sys v0.1.24
[INFO] [stderr]     Checking backtrace v0.3.9
[INFO] [stderr]    Compiling synstructure v0.9.0
[INFO] [stderr]    Compiling failure_derive v0.1.2
[INFO] [stderr]     Checking failure v0.1.2
[INFO] [stderr]     Checking trace-prototype v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `channel`
[INFO] [stderr]   --> src/main.rs:15:17
[INFO] [stderr]    |
[INFO] [stderr] 15 | use crossbeam::{channel, queue::SegQueue, Receiver, Sender};
[INFO] [stderr]    |                 ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `channel`
[INFO] [stderr]   --> src/main.rs:15:17
[INFO] [stderr]    |
[INFO] [stderr] 15 | use crossbeam::{channel, queue::SegQueue, Receiver, Sender};
[INFO] [stderr]    |                 ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `Channels`
[INFO] [stderr]   --> src/main.rs:36:1
[INFO] [stderr]    |
[INFO] [stderr] 36 | type Channels = Vec<(Sender<Span>, Receiver<Span>)>;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Super`
[INFO] [stderr]   --> src/main.rs:37:1
[INFO] [stderr]    |
[INFO] [stderr] 37 | struct Super {
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/main.rs:43:5
[INFO] [stderr]    |
[INFO] [stderr] 43 |     fn new(queue: SegQueue<Span>, channels: Channels) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `Channels`
[INFO] [stderr]   --> src/main.rs:36:1
[INFO] [stderr]    |
[INFO] [stderr] 36 | type Channels = Vec<(Sender<Span>, Receiver<Span>)>;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Super`
[INFO] [stderr]   --> src/main.rs:37:1
[INFO] [stderr]    |
[INFO] [stderr] 37 | struct Super {
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/main.rs:43:5
[INFO] [stderr]    |
[INFO] [stderr] 43 |     fn new(queue: SegQueue<Span>, channels: Channels) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 20.74s
[INFO] running `"docker" "inspect" "59c9058dfd767e2b6aeb5f70711abd4d6558a829502d9f1aca136431f2520e73"`
[INFO] running `"docker" "rm" "-f" "59c9058dfd767e2b6aeb5f70711abd4d6558a829502d9f1aca136431f2520e73"`
[INFO] [stdout] 59c9058dfd767e2b6aeb5f70711abd4d6558a829502d9f1aca136431f2520e73