[INFO] fetching crate mlcg-derive 0.0.1...
[INFO] testing mlcg-derive-0.0.1 against try#dec9417b8611e34e787a3e4c37686b5131f9e5c5 for pr-154210-1
[INFO] extracting crate mlcg-derive 0.0.1 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate mlcg-derive 0.0.1
[INFO] finished tweaking crates.io crate mlcg-derive 0.0.1
[INFO] tweaked toml for crates.io crate mlcg-derive 0.0.1 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate mlcg-derive 0.0.1 on toolchain dec9417b8611e34e787a3e4c37686b5131f9e5c5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "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" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 11 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] feec409669551cc30ba679e2bf1b9ed3f564ecc3219eecf374448ab47d1eb4d5
[INFO] running `Command { std: "docker" "start" "-a" "feec409669551cc30ba679e2bf1b9ed3f564ecc3219eecf374448ab47d1eb4d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "feec409669551cc30ba679e2bf1b9ed3f564ecc3219eecf374448ab47d1eb4d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "feec409669551cc30ba679e2bf1b9ed3f564ecc3219eecf374448ab47d1eb4d5", kill_on_drop: false }`
[INFO] [stdout] feec409669551cc30ba679e2bf1b9ed3f564ecc3219eecf374448ab47d1eb4d5
[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=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" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fe38aef33f495a367370bf7e7eb970876f851c5d7a2983c73ed675c1694dc93c
[INFO] running `Command { std: "docker" "start" "-a" "fe38aef33f495a367370bf7e7eb970876f851c5d7a2983c73ed675c1694dc93c", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling itoa v1.0.18
[INFO] [stderr]    Compiling zmij v1.0.21
[INFO] [stderr]    Compiling serde_json v1.0.149
[INFO] [stderr]    Compiling mlcg-derive v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/lib.rs:26:35
[INFO] [stdout]    |
[INFO] [stdout] 26 |         let path = PathBuf::from(&std::env::var("CARGO_MANIFEST_DIR")?).join(
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Result<_, Box<dyn Error>>`, found `Result<_, VarError>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected enum `Result<_, std::boxed::Box<dyn std::error::Error>>`
[INFO] [stdout]               found enum `Result<_, VarError>`
[INFO] [stdout] help: consider using `Result::expect` to unwrap the `Result<_, VarError>` value, panicking if the value is a `Result::Err`
[INFO] [stdout]    |
[INFO] [stdout] 26 |         let path = PathBuf::from(&std::env::var("CARGO_MANIFEST_DIR")?.expect("REASON")).join(
[INFO] [stdout]    |                                                                       +++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mlcg-derive` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "fe38aef33f495a367370bf7e7eb970876f851c5d7a2983c73ed675c1694dc93c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fe38aef33f495a367370bf7e7eb970876f851c5d7a2983c73ed675c1694dc93c", kill_on_drop: false }`
[INFO] [stdout] fe38aef33f495a367370bf7e7eb970876f851c5d7a2983c73ed675c1694dc93c