[INFO] fetching crate narc 0.2.0...
[INFO] checking narc-0.2.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate narc 0.2.0 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate narc 0.2.0 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate narc 0.2.0
[INFO] finished tweaking crates.io crate narc 0.2.0
[INFO] tweaked toml for crates.io crate narc 0.2.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 28 packages
[INFO] [stderr]       Adding num v0.2.1 (latest: v0.4.1)
[INFO] [stderr]       Adding num-complex v0.2.4 (latest: v0.4.5)
[INFO] [stderr]       Adding num-rational v0.2.4 (latest: v0.4.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded nitro_fs v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 81ee9689bd2367f6368bf8919d02455944f5881536a3e3c39dff9a21d226639a
[INFO] running `Command { std: "docker" "start" "-a" "81ee9689bd2367f6368bf8919d02455944f5881536a3e3c39dff9a21d226639a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "81ee9689bd2367f6368bf8919d02455944f5881536a3e3c39dff9a21d226639a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "81ee9689bd2367f6368bf8919d02455944f5881536a3e3c39dff9a21d226639a", kill_on_drop: false }`
[INFO] [stdout] 81ee9689bd2367f6368bf8919d02455944f5881536a3e3c39dff9a21d226639a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d4af1dcca9d087d5158519d3c1a1177cfa6064c5acf41bdaae9959b37f09cd2b
[INFO] running `Command { std: "docker" "start" "-a" "d4af1dcca9d087d5158519d3c1a1177cfa6064c5acf41bdaae9959b37f09cd2b", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.18
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]     Checking memmap v0.7.0
[INFO] [stderr]     Checking rayon v1.10.0
[INFO] [stderr]     Checking num-integer v0.1.46
[INFO] [stderr]     Checking num-iter v0.1.44
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]     Checking nitro_fs v0.2.0
[INFO] [stderr]     Checking narc v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `thiserror` is imported redundantly
[INFO] [stdout]   --> src/extract.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use thiserror;
[INFO] [stdout]    |     ^^^^^^^^^ the item `thiserror` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fat`
[INFO] [stdout]   --> src/extract.rs:68:13
[INFO] [stdout]    |
[INFO] [stdout] 68 |         let fat = &self.data[fat_offset..fat_offset + file_count * 8];
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_fat`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `read_u32` is never used
[INFO] [stdout]   --> src/extract.rs:97:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | impl Extractor {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 97 |     fn read_u32(&self, offset: usize) -> Result<u32> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `thiserror` is imported redundantly
[INFO] [stdout]   --> src/extract.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use thiserror;
[INFO] [stdout]    |     ^^^^^^^^^ the item `thiserror` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fat`
[INFO] [stdout]   --> src/extract.rs:68:13
[INFO] [stdout]    |
[INFO] [stdout] 68 |         let fat = &self.data[fat_offset..fat_offset + file_count * 8];
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_fat`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `read_u32` is never used
[INFO] [stdout]   --> src/extract.rs:97:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | impl Extractor {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 97 |     fn read_u32(&self, offset: usize) -> Result<u32> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.82s
[INFO] running `Command { std: "docker" "inspect" "d4af1dcca9d087d5158519d3c1a1177cfa6064c5acf41bdaae9959b37f09cd2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d4af1dcca9d087d5158519d3c1a1177cfa6064c5acf41bdaae9959b37f09cd2b", kill_on_drop: false }`
[INFO] [stdout] d4af1dcca9d087d5158519d3c1a1177cfa6064c5acf41bdaae9959b37f09cd2b