[INFO] fetching crate slicestring 0.3.3...
[INFO] testing slicestring-0.3.3 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate slicestring 0.3.3 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate slicestring 0.3.3
[INFO] finished tweaking crates.io crate slicestring 0.3.3
[INFO] tweaked toml for crates.io crate slicestring 0.3.3 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate slicestring 0.3.3 on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "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" "+beta-2026-04-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 55e4502044f9231fc40780bd0c13b42e30579c04b5558f0173cd9888a9dc5369
[INFO] running `Command { std: "docker" "start" "-a" "55e4502044f9231fc40780bd0c13b42e30579c04b5558f0173cd9888a9dc5369", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "55e4502044f9231fc40780bd0c13b42e30579c04b5558f0173cd9888a9dc5369", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "55e4502044f9231fc40780bd0c13b42e30579c04b5558f0173cd9888a9dc5369", kill_on_drop: false }`
[INFO] [stdout] 55e4502044f9231fc40780bd0c13b42e30579c04b5558f0173cd9888a9dc5369
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cbc01ca0d39a6724e7bdacbb6c14cf9bd4a764ea85b86295af5a2c94ba22f3bf
[INFO] running `Command { std: "docker" "start" "-a" "cbc01ca0d39a6724e7bdacbb6c14cf9bd4a764ea85b86295af5a2c94ba22f3bf", kill_on_drop: false }`
[INFO] [stderr]    Compiling slicestring v0.3.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]   --> src/range.rs:12:28
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let mut y: usize = 0;
[INFO] [stdout]    |                            ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 17 |             y = self.end;
[INFO] [stdout]    |             ------------ `y` is overwritten here before the previous value is read
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.35s
[INFO] running `Command { std: "docker" "inspect" "cbc01ca0d39a6724e7bdacbb6c14cf9bd4a764ea85b86295af5a2c94ba22f3bf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cbc01ca0d39a6724e7bdacbb6c14cf9bd4a764ea85b86295af5a2c94ba22f3bf", kill_on_drop: false }`
[INFO] [stdout] cbc01ca0d39a6724e7bdacbb6c14cf9bd4a764ea85b86295af5a2c94ba22f3bf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e286fef573a6d856b3520a68f89d2fcf6b1803c7e45241d720120af254be8749
[INFO] running `Command { std: "docker" "start" "-a" "e286fef573a6d856b3520a68f89d2fcf6b1803c7e45241d720120af254be8749", kill_on_drop: false }`
[INFO] [stderr]    Compiling slicestring v0.3.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]   --> src/range.rs:12:28
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let mut y: usize = 0;
[INFO] [stdout]    |                            ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 17 |             y = self.end;
[INFO] [stdout]    |             ------------ `y` is overwritten here before the previous value is read
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]   --> src/range.rs:12:28
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let mut y: usize = 0;
[INFO] [stdout]    |                            ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 17 |             y = self.end;
[INFO] [stdout]    |             ------------ `y` is overwritten here before the previous value is read
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.36s
[INFO] running `Command { std: "docker" "inspect" "e286fef573a6d856b3520a68f89d2fcf6b1803c7e45241d720120af254be8749", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e286fef573a6d856b3520a68f89d2fcf6b1803c7e45241d720120af254be8749", kill_on_drop: false }`
[INFO] [stdout] e286fef573a6d856b3520a68f89d2fcf6b1803c7e45241d720120af254be8749
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] d5aeab078478c81deb5b095d61b67aed05767e5e7f179209e30b7a052effa684
[INFO] running `Command { std: "docker" "start" "-a" "d5aeab078478c81deb5b095d61b67aed05767e5e7f179209e30b7a052effa684", kill_on_drop: false }`
[INFO] [stderr] warning: value assigned to `y` is never read
[INFO] [stderr]   --> src/range.rs:12:28
[INFO] [stderr]    |
[INFO] [stderr] 12 |         let mut y: usize = 0;
[INFO] [stderr]    |                            ^ this value is reassigned later and never used
[INFO] [stderr] ...
[INFO] [stderr] 17 |             y = self.end;
[INFO] [stderr]    |             ------------ `y` is overwritten here before the previous value is read
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `slicestring` (lib) generated 1 warning
[INFO] [stderr] warning: `slicestring` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/slicestring-e562997ac7015581)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests slicestring
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test src/lib.rs - (line 8) ... FAILED
[INFO] [stdout] test src/lib.rs - String::slice (line 40) ... FAILED
[INFO] [stdout] test src/lib.rs - (line 18) ... FAILED
[INFO] [stdout] test src/lib.rs - str::slice (line 70) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - (line 8) stdout ----
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/lib.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | let mut s = "hello world!";
[INFO] [stdout]    |             -------------- expected due to this value
[INFO] [stdout] 13 | s = s.slice(..5);
[INFO] [stdout]    |     ^^^^^^^^^^^^ expected `&str`, found `String`
[INFO] [stdout]    |
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]    |
[INFO] [stdout] 13 | s = &s.slice(..5);
[INFO] [stdout]    |     +
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - String::slice (line 40) stdout ----
[INFO] [stdout] error[E0599]: no method named `slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/lib.rs:42:7
[INFO] [stdout]    |
[INFO] [stdout] 42 | s = s.slice(..5);
[INFO] [stdout]    |       ^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `split_once` with a similar name
[INFO] [stdout]    |
[INFO] [stdout] 42 - s = s.slice(..5);
[INFO] [stdout] 42 + s = s.split_once(..5);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - (line 18) stdout ----
[INFO] [stdout] error[E0599]: no method named `slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/lib.rs:20:7
[INFO] [stdout]    |
[INFO] [stdout] 20 | s = s.slice(5..);
[INFO] [stdout]    |       ^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `split_once` with a similar name
[INFO] [stdout]    |
[INFO] [stdout] 20 - s = s.slice(5..);
[INFO] [stdout] 20 + s = s.split_once(5..);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - str::slice (line 70) stdout ----
[INFO] [stdout] error[E0599]: no method named `slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/lib.rs:72:7
[INFO] [stdout]    |
[INFO] [stdout] 72 | s = s.slice(..5);
[INFO] [stdout]    |       ^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `split_once` with a similar name
[INFO] [stdout]    |
[INFO] [stdout] 72 - s = s.slice(..5);
[INFO] [stdout] 72 + s = s.split_once(..5);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 18)
[INFO] [stdout]     src/lib.rs - (line 8)
[INFO] [stdout]     src/lib.rs - String::slice (line 40)
[INFO] [stdout]     src/lib.rs - str::slice (line 70)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 4 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.27s
[INFO] [stdout] 
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] running `Command { std: "docker" "inspect" "d5aeab078478c81deb5b095d61b67aed05767e5e7f179209e30b7a052effa684", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5aeab078478c81deb5b095d61b67aed05767e5e7f179209e30b7a052effa684", kill_on_drop: false }`
[INFO] [stdout] d5aeab078478c81deb5b095d61b67aed05767e5e7f179209e30b7a052effa684
