[INFO] fetching crate midstring 0.1.3...
[INFO] testing midstring-0.1.3 against beta-2025-10-28 for beta-1.92-2
[INFO] extracting crate midstring 0.1.3 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate midstring 0.1.3
[INFO] finished tweaking crates.io crate midstring 0.1.3
[INFO] tweaked toml for crates.io crate midstring 0.1.3 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate midstring 0.1.3 on toolchain beta-2025-10-28
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate midstring 0.1.3 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" "+beta-2025-10-28" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+beta-2025-10-28" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c36f75aacab142a8846879e65db03aff5353c4148aa49f3f09384f1f909df6be
[INFO] running `Command { std: "docker" "start" "-a" "c36f75aacab142a8846879e65db03aff5353c4148aa49f3f09384f1f909df6be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c36f75aacab142a8846879e65db03aff5353c4148aa49f3f09384f1f909df6be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c36f75aacab142a8846879e65db03aff5353c4148aa49f3f09384f1f909df6be", kill_on_drop: false }`
[INFO] [stdout] c36f75aacab142a8846879e65db03aff5353c4148aa49f3f09384f1f909df6be
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5b8dd4dc2faac15f7688dfe1a2513e9b6d8c32fb6e4732fae18ff450c71ab079
[INFO] running `Command { std: "docker" "start" "-a" "5b8dd4dc2faac15f7688dfe1a2513e9b6d8c32fb6e4732fae18ff450c71ab079", kill_on_drop: false }`
[INFO] [stderr]    Compiling midstring v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `len` is never read
[INFO] [stdout]    --> src/lib.rs:153:13
[INFO] [stdout]     |
[INFO] [stdout] 153 |             len += 1;
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[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 0.62s
[INFO] running `Command { std: "docker" "inspect" "5b8dd4dc2faac15f7688dfe1a2513e9b6d8c32fb6e4732fae18ff450c71ab079", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b8dd4dc2faac15f7688dfe1a2513e9b6d8c32fb6e4732fae18ff450c71ab079", kill_on_drop: false }`
[INFO] [stdout] 5b8dd4dc2faac15f7688dfe1a2513e9b6d8c32fb6e4732fae18ff450c71ab079
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dc840bf580af6ec0df7d76b67c7ea30ddaf826c60302cef01982e6773a30bf12
[INFO] running `Command { std: "docker" "start" "-a" "dc840bf580af6ec0df7d76b67c7ea30ddaf826c60302cef01982e6773a30bf12", kill_on_drop: false }`
[INFO] [stdout] warning: value assigned to `len` is never read
[INFO] [stdout]    --> src/lib.rs:153:13
[INFO] [stdout]     |
[INFO] [stdout] 153 |             len += 1;
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling midstring v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `len` is never read
[INFO] [stdout]    --> src/lib.rs:153:13
[INFO] [stdout]     |
[INFO] [stdout] 153 |             len += 1;
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[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 0.62s
[INFO] running `Command { std: "docker" "inspect" "dc840bf580af6ec0df7d76b67c7ea30ddaf826c60302cef01982e6773a30bf12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc840bf580af6ec0df7d76b67c7ea30ddaf826c60302cef01982e6773a30bf12", kill_on_drop: false }`
[INFO] [stdout] dc840bf580af6ec0df7d76b67c7ea30ddaf826c60302cef01982e6773a30bf12
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 0294c1fbe36fa6a27e2f24615656f7d4c4e9ce65cf1009c6a6d4b9dfafcf6326
[INFO] running `Command { std: "docker" "start" "-a" "0294c1fbe36fa6a27e2f24615656f7d4c4e9ce65cf1009c6a6d4b9dfafcf6326", kill_on_drop: false }`
[INFO] [stderr] warning: value assigned to `len` is never read
[INFO] [stderr]    --> src/lib.rs:153:13
[INFO] [stderr]     |
[INFO] [stderr] 153 |             len += 1;
[INFO] [stderr]     |             ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `midstring` (lib) generated 1 warning
[INFO] [stderr] warning: `midstring` (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/midstring-1a4b0064e1496c72)
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test tests::test_consecutive_characters_2 ... ok
[INFO] [stdout] test tests::test_right_character_is_a_or_b ... ok
[INFO] [stdout] test tests::test_consecutive_characters_1 ... ok
[INFO] [stdout] test tests::test_basic_case ... ok
[INFO] [stdout] test tests::test_simple ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/midstring-670eb835632d1a81)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests midstring
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test src/lib.rs - (line 4) ... ok
[INFO] [stdout] test src/lib.rs - mid_string (line 99) ... ok
[INFO] [stdout] test src/lib.rs - (line 28) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.34s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "0294c1fbe36fa6a27e2f24615656f7d4c4e9ce65cf1009c6a6d4b9dfafcf6326", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0294c1fbe36fa6a27e2f24615656f7d4c4e9ce65cf1009c6a6d4b9dfafcf6326", kill_on_drop: false }`
[INFO] [stdout] 0294c1fbe36fa6a27e2f24615656f7d4c4e9ce65cf1009c6a6d4b9dfafcf6326