[INFO] fetching crate halfling 0.8.0...
[INFO] checking halfling-0.8.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate halfling 0.8.0 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate halfling 0.8.0
[INFO] finished tweaking crates.io crate halfling 0.8.0
[INFO] tweaked toml for crates.io crate halfling 0.8.0 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate halfling 0.8.0 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] crate crates.io crate halfling 0.8.0 already has a lockfile, it will not be regenerated
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 2c02f47b24f6bb893ac50f073639fafc26e67ced999dfc4010afb4b45389f2fc
[INFO] running `Command { std: "docker" "start" "-a" "2c02f47b24f6bb893ac50f073639fafc26e67ced999dfc4010afb4b45389f2fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2c02f47b24f6bb893ac50f073639fafc26e67ced999dfc4010afb4b45389f2fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c02f47b24f6bb893ac50f073639fafc26e67ced999dfc4010afb4b45389f2fc", kill_on_drop: false }`
[INFO] [stdout] 2c02f47b24f6bb893ac50f073639fafc26e67ced999dfc4010afb4b45389f2fc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] e75ccd263a115c43372577aa686b32e1c322f3389e872708d09f8e8b5203944c
[INFO] running `Command { std: "docker" "start" "-a" "e75ccd263a115c43372577aa686b32e1c322f3389e872708d09f8e8b5203944c", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.94
[INFO] [stderr]    Compiling unicode-ident v1.0.18
[INFO] [stderr]    Compiling thiserror v2.0.12
[INFO] [stderr]    Compiling quote v1.0.39
[INFO] [stderr]    Compiling syn v2.0.99
[INFO] [stderr]    Compiling thiserror-impl v2.0.12
[INFO] [stderr]     Checking halfling v0.8.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<u8, Infallible>
[INFO] [stdout]    --> src/internal.rs:92:36
[INFO] [stdout]     |
[INFO] [stdout]  92 |                       let byte: u8 = value.try_into().map_err(|_| crate::NibbleTryFromIntError(value))?;
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/lib.rs:126:1
[INFO] [stdout]     |
[INFO] [stdout] 126 | / nibble_try_from_impls!(
[INFO] [stdout] 127 | |     u8,
[INFO] [stdout] 128 | |     i8,
[INFO] [stdout] 129 | |     core::num::NonZeroU8,
[INFO] [stdout] ...   |
[INFO] [stdout] 141 | |     bool
[INFO] [stdout] 142 | | );
[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 `nibble_try_from_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary transmute
[INFO] [stdout]   --> src/internal.rs:74:18
[INFO] [stdout]    |
[INFO] [stdout] 74 |         unsafe { core::mem::transmute(int) }
[INFO] [stdout]    |                  --------------------^^^^^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  help: replace this with: `u8::cast_signed`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unnecessary_transmutes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `halfling` (lib test) due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<u8, Infallible>
[INFO] [stdout]    --> src/internal.rs:92:36
[INFO] [stdout]     |
[INFO] [stdout]  92 |                       let byte: u8 = value.try_into().map_err(|_| crate::NibbleTryFromIntError(value))?;
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/lib.rs:126:1
[INFO] [stdout]     |
[INFO] [stdout] 126 | / nibble_try_from_impls!(
[INFO] [stdout] 127 | |     u8,
[INFO] [stdout] 128 | |     i8,
[INFO] [stdout] 129 | |     core::num::NonZeroU8,
[INFO] [stdout] ...   |
[INFO] [stdout] 141 | |     bool
[INFO] [stdout] 142 | | );
[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 `nibble_try_from_impls` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary transmute
[INFO] [stdout]   --> src/internal.rs:74:18
[INFO] [stdout]    |
[INFO] [stdout] 74 |         unsafe { core::mem::transmute(int) }
[INFO] [stdout]    |                  --------------------^^^^^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  help: replace this with: `u8::cast_signed`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unnecessary_transmutes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `halfling` (lib) due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "e75ccd263a115c43372577aa686b32e1c322f3389e872708d09f8e8b5203944c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e75ccd263a115c43372577aa686b32e1c322f3389e872708d09f8e8b5203944c", kill_on_drop: false }`
[INFO] [stdout] e75ccd263a115c43372577aa686b32e1c322f3389e872708d09f8e8b5203944c