[INFO] updating cached repository Byron/rust-tracer
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Byron/rust-tracer
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Byron/rust-tracer" "work/ex/beta-1.38-1/sources/1.37.0/gh/Byron/rust-tracer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Byron/rust-tracer'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Byron/rust-tracer" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Byron/rust-tracer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Byron/rust-tracer'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f16522fbd01fb1361ac4b94746e3d46539a54355
[INFO] sha for GitHub repo Byron/rust-tracer: f16522fbd01fb1361ac4b94746e3d46539a54355
[INFO] validating manifest of Byron/rust-tracer on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Byron/rust-tracer on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Byron/rust-tracer
[INFO] finished frobbing Byron/rust-tracer
[INFO] frobbed toml for Byron/rust-tracer written to work/ex/beta-1.38-1/sources/1.37.0/gh/Byron/rust-tracer/Cargo.toml
[INFO] started frobbing Byron/rust-tracer
[INFO] finished frobbing Byron/rust-tracer
[INFO] frobbed toml for Byron/rust-tracer written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Byron/rust-tracer/Cargo.toml
[INFO] crate Byron/rust-tracer already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Byron/rust-tracer/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing Byron/rust-tracer against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Byron/rust-tracer:/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=warn" "-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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 68f5187c1b6c55fa44b7a7d5800877f8ece30ca1205c0f36e54bc795fd40b963
[INFO] running `"docker" "start" "-a" "68f5187c1b6c55fa44b7a7d5800877f8ece30ca1205c0f36e54bc795fd40b963"`
[INFO] [stderr]    Compiling unicode-width v0.1.6
[INFO] [stderr]    Compiling threadpool v1.7.1
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling rtrace v1.0.0 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/rust/render.rs:262:32
[INFO] [stderr]     |
[INFO] [stderr] 262 |                   writer: &mut RGBABufferWriter,
[INFO] [stderr]     |                                ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn RGBABufferWriter`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/rust/render.rs:364:23
[INFO] [stderr]     |
[INFO] [stderr] 364 |         let out: &mut io::Write = match *self.out {
[INFO] [stderr]     |                       ^^^^^^^^^ help: use `dyn`: `dyn io::Write`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 19.61s
[INFO] running `"docker" "inspect" "68f5187c1b6c55fa44b7a7d5800877f8ece30ca1205c0f36e54bc795fd40b963"`
[INFO] running `"docker" "rm" "-f" "68f5187c1b6c55fa44b7a7d5800877f8ece30ca1205c0f36e54bc795fd40b963"`
[INFO] [stdout] 68f5187c1b6c55fa44b7a7d5800877f8ece30ca1205c0f36e54bc795fd40b963
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Byron/rust-tracer:/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=warn" "-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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] c05add492f4b8e1fe2300f350438c4439e61ff23c8ffb5d8b39a344bec8ee88a
[INFO] running `"docker" "start" "-a" "c05add492f4b8e1fe2300f350438c4439e61ff23c8ffb5d8b39a344bec8ee88a"`
[INFO] [stderr]    Compiling rtrace v1.0.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/rust/lib.rs:1:19
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![cfg_attr(test, feature(test))]
[INFO] [stderr]   |                   ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/rust/render.rs:262:32
[INFO] [stderr]     |
[INFO] [stderr] 262 |                   writer: &mut RGBABufferWriter,
[INFO] [stderr]     |                                ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn RGBABufferWriter`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/rust/render.rs:364:23
[INFO] [stderr]     |
[INFO] [stderr] 364 |         let out: &mut io::Write = match *self.out {
[INFO] [stderr]     |                       ^^^^^^^^^ help: use `dyn`: `dyn io::Write`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `rtrace`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "c05add492f4b8e1fe2300f350438c4439e61ff23c8ffb5d8b39a344bec8ee88a"`
[INFO] running `"docker" "rm" "-f" "c05add492f4b8e1fe2300f350438c4439e61ff23c8ffb5d8b39a344bec8ee88a"`
[INFO] [stdout] c05add492f4b8e1fe2300f350438c4439e61ff23c8ffb5d8b39a344bec8ee88a