[INFO] fetching crate ubend 0.2.1...
[INFO] checking ubend-0.2.1 against master#a609fb45efad59dfd459c76e50899be9f0583b5a for pr-80579
[INFO] extracting crate ubend 0.2.1 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate ubend 0.2.1 on toolchain a609fb45efad59dfd459c76e50899be9f0583b5a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ubend 0.2.1
[INFO] finished tweaking crates.io crate ubend 0.2.1
[INFO] tweaked toml for crates.io crate ubend 0.2.1 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dd140b5784422007c2fecb90483c50b02a65420976be5005ab4767447726c913
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "dd140b5784422007c2fecb90483c50b02a65420976be5005ab4767447726c913", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dd140b5784422007c2fecb90483c50b02a65420976be5005ab4767447726c913", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd140b5784422007c2fecb90483c50b02a65420976be5005ab4767447726c913", kill_on_drop: false }`
[INFO] [stdout] dd140b5784422007c2fecb90483c50b02a65420976be5005ab4767447726c913
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c4e4f1e7ecd2c00c7480415f37124c07bf3c321ef6f0685288c1bfec2bdc23a3
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "c4e4f1e7ecd2c00c7480415f37124c07bf3c321ef6f0685288c1bfec2bdc23a3", kill_on_drop: false }`
[INFO] [stderr]     Checking ubend v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:535:13
[INFO] [stdout]     |
[INFO] [stdout] 535 |         (self as &Display).fmt(f)
[INFO] [stdout]     |                   ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:541:13
[INFO] [stdout]     |
[INFO] [stdout] 541 |         (self as &Display).fmt(f)
[INFO] [stdout]     |                   ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:547:13
[INFO] [stdout]     |
[INFO] [stdout] 547 |         (self as &Display).fmt(f)
[INFO] [stdout]     |                   ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:553:13
[INFO] [stdout]     |
[INFO] [stdout] 553 |         (self as &Display).fmt(f)
[INFO] [stdout]     |                   ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:535:13
[INFO] [stdout]     |
[INFO] [stdout] 535 |         (self as &Display).fmt(f)
[INFO] [stdout]     |                   ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:541:13
[INFO] [stdout]     |
[INFO] [stdout] 541 |         (self as &Display).fmt(f)
[INFO] [stdout]     |                   ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:547:13
[INFO] [stdout]     |
[INFO] [stdout] 547 |         (self as &Display).fmt(f)
[INFO] [stdout]     |                   ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:553:13
[INFO] [stdout]     |
[INFO] [stdout] 553 |         (self as &Display).fmt(f)
[INFO] [stdout]     |                   ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/lib.rs:1597:10
[INFO] [stdout]      |
[INFO] [stdout] 1597 |                     for mut child in &mut children {
[INFO] [stdout]      |                         ----^^^^^
[INFO] [stdout]      |                         |
[INFO] [stdout]      |                         help: remove this `mut`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:911:6
[INFO] [stdout]     |
[INFO] [stdout] 911 |         if unsafe { WIFEXITED(status) } {
[INFO] [stdout]     |            ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:912:14
[INFO] [stdout]     |
[INFO] [stdout] 912 |             return Ok(unsafe { WEXITSTATUS(status) });
[INFO] [stdout]     |                       ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:915:6
[INFO] [stdout]     |
[INFO] [stdout] 915 |         if unsafe { WIFSIGNALED(status) } {
[INFO] [stdout]     |            ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:916:40
[INFO] [stdout]     |
[INFO] [stdout] 916 |             return Err(WaitError::ChildSignaled(unsafe { WTERMSIG(status) }));
[INFO] [stdout]     |                                                 ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:919:6
[INFO] [stdout]     |
[INFO] [stdout] 919 |         if unsafe { WCOREDUMP(status) } {
[INFO] [stdout]     |            ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:923:6
[INFO] [stdout]     |
[INFO] [stdout] 923 |         if unsafe { WIFSTOPPED(status) } {
[INFO] [stdout]     |            ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:924:39
[INFO] [stdout]     |
[INFO] [stdout] 924 |             return Err(WaitError::ChildStopped(unsafe { WSTOPSIG(status) }));
[INFO] [stdout]     |                                                ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:927:6
[INFO] [stdout]     |
[INFO] [stdout] 927 |         if unsafe { WIFCONTINUED(status) } {
[INFO] [stdout]     |            ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/lib.rs:1597:10
[INFO] [stdout]      |
[INFO] [stdout] 1597 |                     for mut child in &mut children {
[INFO] [stdout]      |                         ----^^^^^
[INFO] [stdout]      |                         |
[INFO] [stdout]      |                         help: remove this `mut`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:911:6
[INFO] [stdout]     |
[INFO] [stdout] 911 |         if unsafe { WIFEXITED(status) } {
[INFO] [stdout]     |            ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:912:14
[INFO] [stdout]     |
[INFO] [stdout] 912 |             return Ok(unsafe { WEXITSTATUS(status) });
[INFO] [stdout]     |                       ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:915:6
[INFO] [stdout]     |
[INFO] [stdout] 915 |         if unsafe { WIFSIGNALED(status) } {
[INFO] [stdout]     |            ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:916:40
[INFO] [stdout]     |
[INFO] [stdout] 916 |             return Err(WaitError::ChildSignaled(unsafe { WTERMSIG(status) }));
[INFO] [stdout]     |                                                 ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:919:6
[INFO] [stdout]     |
[INFO] [stdout] 919 |         if unsafe { WCOREDUMP(status) } {
[INFO] [stdout]     |            ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:923:6
[INFO] [stdout]     |
[INFO] [stdout] 923 |         if unsafe { WIFSTOPPED(status) } {
[INFO] [stdout]     |            ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:924:39
[INFO] [stdout]     |
[INFO] [stdout] 924 |             return Err(WaitError::ChildStopped(unsafe { WSTOPSIG(status) }));
[INFO] [stdout]     |                                                ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:927:6
[INFO] [stdout]     |
[INFO] [stdout] 927 |         if unsafe { WIFCONTINUED(status) } {
[INFO] [stdout]     |            ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> tests/main.rs:180:3
[INFO] [stdout]     |
[INFO] [stdout] 180 |         write!(stream, "hello world");
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> tests/main.rs:211:3
[INFO] [stdout]     |
[INFO] [stdout] 211 |         write!(stream, "spam\neggs\nspam spam\n");
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.75s
[INFO] running `Command { std: "docker" "inspect" "c4e4f1e7ecd2c00c7480415f37124c07bf3c321ef6f0685288c1bfec2bdc23a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c4e4f1e7ecd2c00c7480415f37124c07bf3c321ef6f0685288c1bfec2bdc23a3", kill_on_drop: false }`
[INFO] [stdout] c4e4f1e7ecd2c00c7480415f37124c07bf3c321ef6f0685288c1bfec2bdc23a3