[INFO] updating cached repository panzi/rust-ubend
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/panzi/rust-ubend
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/panzi/rust-ubend" "work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/panzi/rust-ubend"`
[INFO] [stderr] Cloning into 'work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/panzi/rust-ubend'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/panzi/rust-ubend" "work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/panzi/rust-ubend"`
[INFO] [stderr] Cloning into 'work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/panzi/rust-ubend'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 16a6ac1c07778f3fedd761068aae403dfccaedf3
[INFO] sha for GitHub repo panzi/rust-ubend: 16a6ac1c07778f3fedd761068aae403dfccaedf3
[INFO] validating manifest of panzi/rust-ubend on toolchain master#452087b4bf18cece2d52d7cd8c9147195e5404bf
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of panzi/rust-ubend on toolchain try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing panzi/rust-ubend
[INFO] finished frobbing panzi/rust-ubend
[INFO] frobbed toml for panzi/rust-ubend written to work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/panzi/rust-ubend/Cargo.toml
[INFO] started frobbing panzi/rust-ubend
[INFO] finished frobbing panzi/rust-ubend
[INFO] frobbed toml for panzi/rust-ubend written to work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/panzi/rust-ubend/Cargo.toml
[INFO] crate panzi/rust-ubend already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking panzi/rust-ubend against try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab for pr-63247
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63247/worker-7/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/panzi/rust-ubend:/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" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 8c40cf7e97e50ea8338b1bd619c14d8287de7dec2d751b76220423db12f1e9c1
[INFO] running `"docker" "start" "-a" "8c40cf7e97e50ea8338b1bd619c14d8287de7dec2d751b76220423db12f1e9c1"`
[INFO] [stderr]     Checking libc v0.2.43
[INFO] [stderr]     Checking ubend v0.2.1 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:535:13
[INFO] [stderr]     |
[INFO] [stderr] 535 |         (self as &Display).fmt(f)
[INFO] [stderr]     |                   ^^^^^^^ help: use `dyn`: `dyn Display`
[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/lib.rs:541:13
[INFO] [stderr]     |
[INFO] [stderr] 541 |         (self as &Display).fmt(f)
[INFO] [stderr]     |                   ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:547:13
[INFO] [stderr]     |
[INFO] [stderr] 547 |         (self as &Display).fmt(f)
[INFO] [stderr]     |                   ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:553:13
[INFO] [stderr]     |
[INFO] [stderr] 553 |         (self as &Display).fmt(f)
[INFO] [stderr]     |                   ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:535:13
[INFO] [stderr]     |
[INFO] [stderr] 535 |         (self as &Display).fmt(f)
[INFO] [stderr]     |                   ^^^^^^^ help: use `dyn`: `dyn Display`
[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/lib.rs:541:13
[INFO] [stderr]     |
[INFO] [stderr] 541 |         (self as &Display).fmt(f)
[INFO] [stderr]     |                   ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:547:13
[INFO] [stderr]     |
[INFO] [stderr] 547 |         (self as &Display).fmt(f)
[INFO] [stderr]     |                   ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:553:13
[INFO] [stderr]     |
[INFO] [stderr] 553 |         (self as &Display).fmt(f)
[INFO] [stderr]     |                   ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/lib.rs:1703:10
[INFO] [stderr]      |
[INFO] [stderr] 1703 |                     for mut child in &mut children {
[INFO] [stderr]      |                         ----^^^^^
[INFO] [stderr]      |                         |
[INFO] [stderr]      |                         help: remove this `mut`
[INFO] [stderr]      |
[INFO] [stderr]      = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/lib.rs:1703:10
[INFO] [stderr]      |
[INFO] [stderr] 1703 |                     for mut child in &mut children {
[INFO] [stderr]      |                         ----^^^^^
[INFO] [stderr]      |                         |
[INFO] [stderr]      |                         help: remove this `mut`
[INFO] [stderr]      |
[INFO] [stderr]      = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> tests/main.rs:180:3
[INFO] [stderr]     |
[INFO] [stderr] 180 |         write!(stream, "hello world");
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> tests/main.rs:211:3
[INFO] [stderr]     |
[INFO] [stderr] 211 |         write!(stream, "spam\neggs\nspam spam\n");
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.26s
[INFO] running `"docker" "inspect" "8c40cf7e97e50ea8338b1bd619c14d8287de7dec2d751b76220423db12f1e9c1"`
[INFO] running `"docker" "rm" "-f" "8c40cf7e97e50ea8338b1bd619c14d8287de7dec2d751b76220423db12f1e9c1"`
[INFO] [stdout] 8c40cf7e97e50ea8338b1bd619c14d8287de7dec2d751b76220423db12f1e9c1