[INFO] fetching crate fnerror 0.1.4... [INFO] testing fnerror-0.1.4 against master#562dee4820c458d823175268e41601d4c060588a for pr-154210-1 [INFO] extracting crate fnerror 0.1.4 into /workspace/builds/worker-6-tc1/source [INFO] started tweaking crates.io crate fnerror 0.1.4 [INFO] finished tweaking crates.io crate fnerror 0.1.4 [INFO] tweaked toml for crates.io crate fnerror 0.1.4 written to /workspace/builds/worker-6-tc1/source/Cargo.toml [INFO] validating manifest of crates.io crate fnerror 0.1.4 on toolchain 562dee4820c458d823175268e41601d4c060588a [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+562dee4820c458d823175268e41601d4c060588a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate crates.io crate fnerror 0.1.4 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" "+562dee4820c458d823175268e41601d4c060588a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+562dee4820c458d823175268e41601d4c060588a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 3a1393778a415a5301c4a6007ecffa317de46f39818e2fc28ba4941207e43e38 [INFO] running `Command { std: "docker" "start" "-a" "3a1393778a415a5301c4a6007ecffa317de46f39818e2fc28ba4941207e43e38", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "3a1393778a415a5301c4a6007ecffa317de46f39818e2fc28ba4941207e43e38", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "3a1393778a415a5301c4a6007ecffa317de46f39818e2fc28ba4941207e43e38", kill_on_drop: false }` [INFO] [stdout] 3a1393778a415a5301c4a6007ecffa317de46f39818e2fc28ba4941207e43e38 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+562dee4820c458d823175268e41601d4c060588a" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 1cb06a3d8dae50fe92c8561f6ae55872486b6eeb78daaf32edffb5a8d8acb1ad [INFO] running `Command { std: "docker" "start" "-a" "1cb06a3d8dae50fe92c8561f6ae55872486b6eeb78daaf32edffb5a8d8acb1ad", kill_on_drop: false }` [INFO] [stderr] Compiling proc-macro2 v1.0.101 [INFO] [stderr] Compiling Inflector v0.11.4 [INFO] [stderr] Compiling quote v1.0.40 [INFO] [stderr] Compiling syn v2.0.106 [INFO] [stderr] Compiling fnerror v0.1.4 (/opt/rustwide/workdir) [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.96s [INFO] running `Command { std: "docker" "inspect" "1cb06a3d8dae50fe92c8561f6ae55872486b6eeb78daaf32edffb5a8d8acb1ad", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "1cb06a3d8dae50fe92c8561f6ae55872486b6eeb78daaf32edffb5a8d8acb1ad", kill_on_drop: false }` [INFO] [stdout] 1cb06a3d8dae50fe92c8561f6ae55872486b6eeb78daaf32edffb5a8d8acb1ad [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+562dee4820c458d823175268e41601d4c060588a" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] d6ca5d3f61a5cb523b29cafd80a28ac1241e952b0f685c25aef1855d4f3da643 [INFO] running `Command { std: "docker" "start" "-a" "d6ca5d3f61a5cb523b29cafd80a28ac1241e952b0f685c25aef1855d4f3da643", kill_on_drop: false }` [INFO] [stderr] Compiling fnerror v0.1.4 (/opt/rustwide/workdir) [INFO] [stderr] Finished `test` profile [unoptimized + debuginfo] target(s) in 0.99s [INFO] running `Command { std: "docker" "inspect" "d6ca5d3f61a5cb523b29cafd80a28ac1241e952b0f685c25aef1855d4f3da643", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "d6ca5d3f61a5cb523b29cafd80a28ac1241e952b0f685c25aef1855d4f3da643", kill_on_drop: false }` [INFO] [stdout] d6ca5d3f61a5cb523b29cafd80a28ac1241e952b0f685c25aef1855d4f3da643 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+562dee4820c458d823175268e41601d4c060588a" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] 3d22bc6e5f9c76c4348379491a320b154a823ad55d6ac27c9bcf65e45f15e11a [INFO] running `Command { std: "docker" "start" "-a" "3d22bc6e5f9c76c4348379491a320b154a823ad55d6ac27c9bcf65e45f15e11a", 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/fnerror-3a969c4696106622) [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 fnerror [INFO] [stdout] [INFO] [stdout] running 2 tests [INFO] [stdout] test src/lib.rs - fnerror (line 22) ... FAILED [INFO] [stdout] test src/lib.rs - fnerror (line 47) ... FAILED [INFO] [stdout] [INFO] [stdout] failures: [INFO] [stdout] [INFO] [stdout] ---- src/lib.rs - fnerror (line 22) stdout ---- [INFO] [stdout] error[E0658]: attributes on expressions are experimental [INFO] [stdout] --> src/lib.rs:27:9 [INFO] [stdout] | [INFO] [stdout] 27 | #[fnerr] [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: see issue #15701 for more information [INFO] [stdout] = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable [INFO] [stdout] = note: this compiler was built on 2026-03-21; consider upgrading it if it is out of date [INFO] [stdout] [INFO] [stdout] error[E0658]: attributes on expressions are experimental [INFO] [stdout] --> src/lib.rs:31:9 [INFO] [stdout] | [INFO] [stdout] 31 | #[fnerr] [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: see issue #15701 for more information [INFO] [stdout] = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable [INFO] [stdout] = note: this compiler was built on 2026-03-21; consider upgrading it if it is out of date [INFO] [stdout] [INFO] [stdout] error: cannot find attribute `fnerror` in this scope [INFO] [stdout] --> src/lib.rs:24:3 [INFO] [stdout] | [INFO] [stdout] 24 | #[fnerror] [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] note: `fnerror` is imported here, but it is a crate, not an attribute [INFO] [stdout] --> src/lib.rs:22:1 [INFO] [stdout] | [INFO] [stdout] 22 | extern crate r#fnerror; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] help: consider importing this attribute macro [INFO] [stdout] | [INFO] [stdout] 21 + use fnerror::fnerror; [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] error: cannot find attribute `fnerr` in this scope [INFO] [stdout] --> src/lib.rs:27:11 [INFO] [stdout] | [INFO] [stdout] 27 | #[fnerr] [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] error: cannot find attribute `fnerr` in this scope [INFO] [stdout] --> src/lib.rs:31:11 [INFO] [stdout] | [INFO] [stdout] 31 | #[fnerr] [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] error[E0425]: cannot find type `MyError` in this scope [INFO] [stdout] --> src/lib.rs:25:24 [INFO] [stdout] | [INFO] [stdout] 25 | fn foo() -> Result<(), MyError> { [INFO] [stdout] | ^^^^^^^ not found in this scope [INFO] [stdout] | [INFO] [stdout] help: you might be missing a type parameter [INFO] [stdout] | [INFO] [stdout] 25 | fn foo() -> Result<(), MyError> { [INFO] [stdout] | +++++++++ [INFO] [stdout] [INFO] [stdout] error[E0425]: cannot find function, tuple struct or tuple variant `Error2` in this scope [INFO] [stdout] --> src/lib.rs:28:9 [INFO] [stdout] | [INFO] [stdout] 28 | Error2("{}", e as String) [INFO] [stdout] | ^^^^^^ not found in this scope [INFO] [stdout] [INFO] [stdout] error[E0425]: cannot find function, tuple struct or tuple variant `Error3` in this scope [INFO] [stdout] --> src/lib.rs:32:9 [INFO] [stdout] | [INFO] [stdout] 32 | Error3("{}, {}", e as &'static str, 123 as u8) [INFO] [stdout] | ^^^^^^ not found in this scope [INFO] [stdout] [INFO] [stdout] error: aborting due to 8 previous errors [INFO] [stdout] [INFO] [stdout] Some errors have detailed explanations: E0425, E0658. [INFO] [stdout] For more information about an error, try `rustc --explain E0425`. [INFO] [stdout] Couldn't compile the test. [INFO] [stdout] ---- src/lib.rs - fnerror (line 47) stdout ---- [INFO] [stdout] error[E0433]: cannot find `thiserror` in the crate root [INFO] [stdout] --> src/lib.rs:53:19 [INFO] [stdout] | [INFO] [stdout] 53 | #[derive(Debug, ::thiserror::Error)] [INFO] [stdout] | ^^^^^^^^^ could not find `thiserror` in the list of imported crates [INFO] [stdout] [INFO] [stdout] error: cannot find attribute `error` in this scope [INFO] [stdout] --> src/lib.rs:55:7 [INFO] [stdout] | [INFO] [stdout] 55 | #[error("{}", 0usize)] [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] error: cannot find attribute `error` in this scope [INFO] [stdout] --> src/lib.rs:57:7 [INFO] [stdout] | [INFO] [stdout] 57 | #[error("{}, {}",0usize, 1usize)] [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] error[E0425]: cannot find function `bar` in this scope [INFO] [stdout] --> src/lib.rs:49:5 [INFO] [stdout] | [INFO] [stdout] 49 | bar().map_err(|e| MyError::Error2(e))?; [INFO] [stdout] | ^^^ not found in this scope [INFO] [stdout] [INFO] [stdout] error[E0425]: cannot find function `baz` in this scope [INFO] [stdout] --> src/lib.rs:50:5 [INFO] [stdout] | [INFO] [stdout] 50 | baz().map_err(|e| MyError::Error3(e, 123))?; [INFO] [stdout] | ^^^ not found in this scope [INFO] [stdout] [INFO] [stdout] error: aborting due to 5 previous errors [INFO] [stdout] [INFO] [stdout] Some errors have detailed explanations: E0425, E0433. [INFO] [stdout] For more information about an error, try `rustc --explain E0425`. [INFO] [stdout] Couldn't compile the test. [INFO] [stdout] [INFO] [stdout] failures: [INFO] [stdout] src/lib.rs - fnerror (line 22) [INFO] [stdout] src/lib.rs - fnerror (line 47) [INFO] [stdout] [INFO] [stdout] test result: FAILED. 0 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.25s [INFO] [stdout] [INFO] [stdout] all doctests ran in 0.58s; merged doctests compilation took 0.32s [INFO] [stderr] error: doctest failed, to rerun pass `--doc` [INFO] running `Command { std: "docker" "inspect" "3d22bc6e5f9c76c4348379491a320b154a823ad55d6ac27c9bcf65e45f15e11a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "3d22bc6e5f9c76c4348379491a320b154a823ad55d6ac27c9bcf65e45f15e11a", kill_on_drop: false }` [INFO] [stdout] 3d22bc6e5f9c76c4348379491a320b154a823ad55d6ac27c9bcf65e45f15e11a