[INFO] fetching crate rasta-verilog 0.1.0...
[INFO] checking rasta-verilog-0.1.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate rasta-verilog 0.1.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate rasta-verilog 0.1.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate rasta-verilog 0.1.0
[INFO] tweaked toml for crates.io crate rasta-verilog 0.1.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rasta-verilog 0.1.0 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate rasta-verilog 0.1.0 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] be8ffc0ba30b953068a98895e6ba21eecc23336d18bb6fe71c51b9c91fda6559
[INFO] running `Command { std: "docker" "start" "-a" "be8ffc0ba30b953068a98895e6ba21eecc23336d18bb6fe71c51b9c91fda6559", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "be8ffc0ba30b953068a98895e6ba21eecc23336d18bb6fe71c51b9c91fda6559", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be8ffc0ba30b953068a98895e6ba21eecc23336d18bb6fe71c51b9c91fda6559", kill_on_drop: false }`
[INFO] [stdout] be8ffc0ba30b953068a98895e6ba21eecc23336d18bb6fe71c51b9c91fda6559
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ea80e86b83e45c1dfc80750648ab4c1e598b3af7211b48578da205081a85b722
[INFO] running `Command { std: "docker" "start" "-a" "ea80e86b83e45c1dfc80750648ab4c1e598b3af7211b48578da205081a85b722", kill_on_drop: false }`
[INFO] [stderr]    Compiling thiserror v1.0.63
[INFO] [stderr]    Compiling serde v1.0.210
[INFO] [stderr]    Compiling memchr v2.7.4
[INFO] [stderr]     Checking escape-bytes v0.1.1
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling syn v2.0.77
[INFO] [stderr]     Checking rmp v0.8.14
[INFO] [stderr]    Compiling thiserror-impl v1.0.63
[INFO] [stderr]    Compiling serde_derive v1.0.210
[INFO] [stderr]     Checking rmp-serde v1.3.0
[INFO] [stderr]     Checking pest v2.7.13
[INFO] [stderr]    Compiling pest_meta v2.7.13
[INFO] [stderr]     Checking rasta v0.1.2
[INFO] [stderr]    Compiling pest_generator v2.7.13
[INFO] [stderr]     Checking rasta-verilog v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<String, Error>
[INFO] [stdout]   --> src/lib.rs:20:66
[INFO] [stdout]    |
[INFO] [stdout] 20 |   pub fn generate_verilog(ast: &CompUnit) -> Result<String, Error> {
[INFO] [stdout]    |  __________________________________________________________________^
[INFO] [stdout] 21 | |     let code = Rc::new(RefCell::new(String::new()));
[INFO] [stdout] 22 | |     ast.generate(code.clone())?;
[INFO] [stdout] 23 | |     let code = code.borrow().clone();
[INFO] [stdout] 24 | |     
[INFO] [stdout] 25 | |     Ok(code)
[INFO] [stdout] 26 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Error>
[INFO] [stdout]   --> src/lib.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     ast.generate(code.clone())?;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Error>
[INFO] [stdout]   --> src/lib.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     Ok(code)
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rasta-verilog` (lib) due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "ea80e86b83e45c1dfc80750648ab4c1e598b3af7211b48578da205081a85b722", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea80e86b83e45c1dfc80750648ab4c1e598b3af7211b48578da205081a85b722", kill_on_drop: false }`
[INFO] [stdout] ea80e86b83e45c1dfc80750648ab4c1e598b3af7211b48578da205081a85b722