[INFO] fetching crate u4 0.1.2...
[INFO] checking u4-0.1.2 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate u4 0.1.2 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate u4 0.1.2
[INFO] finished tweaking crates.io crate u4 0.1.2
[INFO] tweaked toml for crates.io crate u4 0.1.2 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate u4 0.1.2 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 22 packages to latest compatible versions
[INFO] [stderr]       Adding itertools v0.13.0 (available: v0.14.0)
[INFO] [stderr]       Adding zerocopy v0.7.35 (available: v0.8.27)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 83f9a78e9a1b5146bdf575096812f68d810b2363be48abe0b060c24b710aff5e
[INFO] running `Command { std: "docker" "start" "-a" "83f9a78e9a1b5146bdf575096812f68d810b2363be48abe0b060c24b710aff5e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "83f9a78e9a1b5146bdf575096812f68d810b2363be48abe0b060c24b710aff5e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "83f9a78e9a1b5146bdf575096812f68d810b2363be48abe0b060c24b710aff5e", kill_on_drop: false }`
[INFO] [stdout] 83f9a78e9a1b5146bdf575096812f68d810b2363be48abe0b060c24b710aff5e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4960c0e2babe33ea2f0fdc848a4be10f47dcc91c80f1f58bb40d370b4b54738c
[INFO] running `Command { std: "docker" "start" "-a" "4960c0e2babe33ea2f0fdc848a4be10f47dcc91c80f1f58bb40d370b4b54738c", kill_on_drop: false }`
[INFO] [stderr]     Checking u4 v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `forward`
[INFO] [stdout]    --> src/lib.rs:880:16
[INFO] [stdout]     |
[INFO] [stdout] 880 | pub(crate) use forward;
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `backward`
[INFO] [stdout]    --> src/lib.rs:889:16
[INFO] [stdout]     |
[INFO] [stdout] 889 | pub(crate) use backward;
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `forward`
[INFO] [stdout]    --> src/lib.rs:880:16
[INFO] [stdout]     |
[INFO] [stdout] 880 | pub(crate) use forward;
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `backward`
[INFO] [stdout]    --> src/lib.rs:889:16
[INFO] [stdout]     |
[INFO] [stdout] 889 | pub(crate) use backward;
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, Infallible>, u8>
[INFO] [stdout]    --> src/lib.rs:433:25
[INFO] [stdout]     |
[INFO] [stdout] 433 |                           u8::try_from(value)?
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 441 | / impl_try_from! {
[INFO] [stdout] 442 | |     u8, u16, u32, u64, u128, usize,
[INFO] [stdout] 443 | |     i8, i16, i32, i64, i128, isize,
[INFO] [stdout] 444 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]     = note: this error originates in the macro `impl_try_from` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u8, Infallible>
[INFO] [stdout]    --> src/lib.rs:433:25
[INFO] [stdout]     |
[INFO] [stdout] 433 |                           u8::try_from(value)?
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 441 | / impl_try_from! {
[INFO] [stdout] 442 | |     u8, u16, u32, u64, u128, usize,
[INFO] [stdout] 443 | |     i8, i16, i32, i64, i128, isize,
[INFO] [stdout] 444 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_try_from` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `u4` (lib) due to 2 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, Infallible>, u8>
[INFO] [stdout]    --> src/lib.rs:433:25
[INFO] [stdout]     |
[INFO] [stdout] 433 |                           u8::try_from(value)?
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 441 | / impl_try_from! {
[INFO] [stdout] 442 | |     u8, u16, u32, u64, u128, usize,
[INFO] [stdout] 443 | |     i8, i16, i32, i64, i128, isize,
[INFO] [stdout] 444 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]     = note: this error originates in the macro `impl_try_from` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u8, Infallible>
[INFO] [stdout]    --> src/lib.rs:433:25
[INFO] [stdout]     |
[INFO] [stdout] 433 |                           u8::try_from(value)?
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 441 | / impl_try_from! {
[INFO] [stdout] 442 | |     u8, u16, u32, u64, u128, usize,
[INFO] [stdout] 443 | |     i8, i16, i32, i64, i128, isize,
[INFO] [stdout] 444 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_try_from` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `u4` (lib test) due to 2 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "4960c0e2babe33ea2f0fdc848a4be10f47dcc91c80f1f58bb40d370b4b54738c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4960c0e2babe33ea2f0fdc848a4be10f47dcc91c80f1f58bb40d370b4b54738c", kill_on_drop: false }`
[INFO] [stdout] 4960c0e2babe33ea2f0fdc848a4be10f47dcc91c80f1f58bb40d370b4b54738c
