[INFO] fetching crate utf8-decode 1.0.1...
[INFO] testing utf8-decode-1.0.1 against 1.90.0 for beta-1.91-3
[INFO] extracting crate utf8-decode 1.0.1 into /workspace/builds/worker-5-tc1/source
[INFO] started tweaking crates.io crate utf8-decode 1.0.1
[INFO] finished tweaking crates.io crate utf8-decode 1.0.1
[INFO] tweaked toml for crates.io crate utf8-decode 1.0.1 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate utf8-decode 1.0.1 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "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" "+1.90.0" "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" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 71b0654a243ed9f9cf4531be0f363128bbf055c3241fa18438a975b789be096f
[INFO] running `Command { std: "docker" "start" "-a" "71b0654a243ed9f9cf4531be0f363128bbf055c3241fa18438a975b789be096f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "71b0654a243ed9f9cf4531be0f363128bbf055c3241fa18438a975b789be096f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "71b0654a243ed9f9cf4531be0f363128bbf055c3241fa18438a975b789be096f", kill_on_drop: false }`
[INFO] [stdout] 71b0654a243ed9f9cf4531be0f363128bbf055c3241fa18438a975b789be096f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bb9fa2b2e00c70fe58f07d31a4ab35353fa2661901b97f4b74cc416262606fd1
[INFO] running `Command { std: "docker" "start" "-a" "bb9fa2b2e00c70fe58f07d31a4ab35353fa2661901b97f4b74cc416262606fd1", kill_on_drop: false }`
[INFO] [stderr]    Compiling utf8-decode v1.0.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.18s
[INFO] running `Command { std: "docker" "inspect" "bb9fa2b2e00c70fe58f07d31a4ab35353fa2661901b97f4b74cc416262606fd1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb9fa2b2e00c70fe58f07d31a4ab35353fa2661901b97f4b74cc416262606fd1", kill_on_drop: false }`
[INFO] [stdout] bb9fa2b2e00c70fe58f07d31a4ab35353fa2661901b97f4b74cc416262606fd1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 31e431e2dee93b3e5f6db2e57b8786722002f4613cebe7642dfe93781559dc0f
[INFO] running `Command { std: "docker" "start" "-a" "31e431e2dee93b3e5f6db2e57b8786722002f4613cebe7642dfe93781559dc0f", kill_on_drop: false }`
[INFO] [stderr]    Compiling utf8-decode v1.0.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.56s
[INFO] running `Command { std: "docker" "inspect" "31e431e2dee93b3e5f6db2e57b8786722002f4613cebe7642dfe93781559dc0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "31e431e2dee93b3e5f6db2e57b8786722002f4613cebe7642dfe93781559dc0f", kill_on_drop: false }`
[INFO] [stdout] 31e431e2dee93b3e5f6db2e57b8786722002f4613cebe7642dfe93781559dc0f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 4e79b1dbf8fe992a8eaf0b0c58625893adce1b54b6ddb523c9937abc529150a4
[INFO] running `Command { std: "docker" "start" "-a" "4e79b1dbf8fe992a8eaf0b0c58625893adce1b54b6ddb523c9937abc529150a4", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/utf8_decode-44f3190dd84873a5)
[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 utf8_decode
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test src/safe.rs - safe::Decoder (line 80) ... FAILED
[INFO] [stdout] test src/lib.rs - UnsafeDecoder (line 141) ... FAILED
[INFO] [stdout] test src/lib.rs - (line 35) ... ok
[INFO] [stdout] test src/lib.rs - (line 9) ... ok
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/safe.rs - safe::Decoder (line 80) stdout ----
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Decoder`
[INFO] [stdout]  --> src/safe.rs:83:15
[INFO] [stdout]   |
[INFO] [stdout] 5 | let decoder = Decoder::new(bytes.iter().cloned());
[INFO] [stdout]   |               ^^^^^^^ use of undeclared type `Decoder`
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]   |
[INFO] [stdout] 2 + use utf8_decode::Decoder;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]  --> src/safe.rs:87:18
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_safe_rs_80_0() {
[INFO] [stdout]   |                                      ----------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 9 |     string.push(c?);
[INFO] [stdout]   |                  ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0433.
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - UnsafeDecoder (line 141) stdout ----
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `File`
[INFO] [stdout]  --> src/lib.rs:142:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | let file = File::open("file.txt")?;
[INFO] [stdout]   |            ^^^^ use of undeclared type `File`
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]   |
[INFO] [stdout] 2 + use std::fs::File;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `UnsafeDecoder`
[INFO] [stdout]  --> src/lib.rs:144:15
[INFO] [stdout]   |
[INFO] [stdout] 5 | let decoder = UnsafeDecoder::new(file.bytes());
[INFO] [stdout]   |               ^^^^^^^^^^^^^ use of undeclared type `UnsafeDecoder`
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]   |
[INFO] [stdout] 2 + use utf8_decode::UnsafeDecoder;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]  --> src/lib.rs:148:18
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_141_0() {
[INFO] [stdout]   |                                      ----------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 9 |     string.push(c?);
[INFO] [stdout]   |                  ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0433.
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - UnsafeDecoder (line 141)
[INFO] [stdout]     src/safe.rs - safe::Decoder (line 80)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 2 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.69s
[INFO] [stdout] 
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] running `Command { std: "docker" "inspect" "4e79b1dbf8fe992a8eaf0b0c58625893adce1b54b6ddb523c9937abc529150a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e79b1dbf8fe992a8eaf0b0c58625893adce1b54b6ddb523c9937abc529150a4", kill_on_drop: false }`
[INFO] [stdout] 4e79b1dbf8fe992a8eaf0b0c58625893adce1b54b6ddb523c9937abc529150a4