[INFO] cloning repository https://github.com/sammyfilly/Letting-kstring
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sammyfilly/Letting-kstring" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsammyfilly%2FLetting-kstring", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsammyfilly%2FLetting-kstring'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5997d7a8b0c51fa5d99a4e38d1ac401bc81fc1e5
[INFO] checking sammyfilly/Letting-kstring against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsammyfilly%2FLetting-kstring" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/sammyfilly/Letting-kstring
[INFO] finished tweaking git repo https://github.com/sammyfilly/Letting-kstring
[INFO] tweaked toml for git repo https://github.com/sammyfilly/Letting-kstring written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/sammyfilly/Letting-kstring 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 git repo https://github.com/sammyfilly/Letting-kstring 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-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] d4fbd7667d30a67d6e55ca5e6272460c8f6561b82102986287af770fadfb7ee9
[INFO] running `Command { std: "docker" "start" "-a" "d4fbd7667d30a67d6e55ca5e6272460c8f6561b82102986287af770fadfb7ee9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d4fbd7667d30a67d6e55ca5e6272460c8f6561b82102986287af770fadfb7ee9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d4fbd7667d30a67d6e55ca5e6272460c8f6561b82102986287af770fadfb7ee9", kill_on_drop: false }`
[INFO] [stdout] d4fbd7667d30a67d6e55ca5e6272460c8f6561b82102986287af770fadfb7ee9
[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] dfe5cad75bf9d26bf2693e6176d1d00c3ecebe1c202df433baa33b5f5174b78c
[INFO] running `Command { std: "docker" "start" "-a" "dfe5cad75bf9d26bf2693e6176d1d00c3ecebe1c202df433baa33b5f5174b78c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.144
[INFO] [stderr]    Compiling syn v1.0.90
[INFO] [stderr]    Compiling crossbeam-utils v0.8.8
[INFO] [stderr]    Compiling serde_derive v1.0.145
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.8
[INFO] [stderr]    Compiling libm v0.2.7
[INFO] [stderr]    Compiling serde v1.0.145
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling io-lifetimes v1.0.11
[INFO] [stderr]    Compiling rustix v0.37.19
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]     Checking clap_lex v0.5.0
[INFO] [stderr]     Checking anstyle v1.0.0
[INFO] [stderr]     Checking plotters-backend v0.3.2
[INFO] [stderr]     Checking fastrand v1.7.0
[INFO] [stderr]     Checking ciborium-io v0.2.0
[INFO] [stderr]     Checking ciborium-ll v0.2.0
[INFO] [stderr]     Checking criterion-plot v0.5.0
[INFO] [stderr]     Checking plotters-svg v0.3.1
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking regex v1.5.5
[INFO] [stderr]     Checking clap_builder v4.3.0
[INFO] [stderr]     Checking once_cell v1.17.2
[INFO] [stderr]     Checking anes v0.1.6
[INFO] [stderr]     Checking unarray v0.1.4
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking oorandom v11.1.3
[INFO] [stderr]     Checking kstring v2.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unexpected `cfg` condition value: `safe`
[INFO] [stdout]   --> src/lib.rs:39:13
[INFO] [stdout]    |
[INFO] [stdout] 39 | #![cfg_attr(feature = "safe", forbid(unsafe_code))]
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected values for `feature` are: `arc`, `default`, `document-features`, `max_inline`, `serde`, `std`, `unsafe`, and `unstable_bench_subset`
[INFO] [stdout]    = help: consider adding `safe` as a feature in `Cargo.toml`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking crossbeam-channel v0.5.4
[INFO] [stdout] error: this type will no longer be must used: Result<string::KStringBase<B>, Infallible>
[INFO] [stdout]    --> src/string.rs:292:53
[INFO] [stdout]     |
[INFO] [stdout] 292 |       fn from_str(s: &str) -> Result<Self, Self::Err> {
[INFO] [stdout]     |  _____________________________________________________^
[INFO] [stdout] 293 | |         Ok(Self::from_ref(s))
[INFO] [stdout] 294 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<string::KStringBase<B>, Infallible>
[INFO] [stdout]    --> src/string.rs:293:9
[INFO] [stdout]     |
[INFO] [stdout] 293 |         Ok(Self::from_ref(s))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<string_cow::KStringCowBase<'_, B>, Infallible>
[INFO] [stdout]    --> src/string_cow.rs:349:53
[INFO] [stdout]     |
[INFO] [stdout] 349 |       fn from_str(s: &str) -> Result<Self, Self::Err> {
[INFO] [stdout]     |  _____________________________________________________^
[INFO] [stdout] 350 | |         Ok(Self::from_string(s.into()))
[INFO] [stdout] 351 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<string_cow::KStringCowBase<'_, B>, Infallible>
[INFO] [stdout]    --> src/string_cow.rs:350:9
[INFO] [stdout]     |
[INFO] [stdout] 350 |         Ok(Self::from_string(s.into()))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `kstring` (lib) due to 4 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "dfe5cad75bf9d26bf2693e6176d1d00c3ecebe1c202df433baa33b5f5174b78c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dfe5cad75bf9d26bf2693e6176d1d00c3ecebe1c202df433baa33b5f5174b78c", kill_on_drop: false }`
[INFO] [stdout] dfe5cad75bf9d26bf2693e6176d1d00c3ecebe1c202df433baa33b5f5174b78c
