[INFO] fetching crate grep_cdylib 0.1.3...
[INFO] checking grep_cdylib-0.1.3 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] extracting crate grep_cdylib 0.1.3 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate grep_cdylib 0.1.3 on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate grep_cdylib 0.1.3
[INFO] finished tweaking crates.io crate grep_cdylib 0.1.3
[INFO] tweaked toml for crates.io crate grep_cdylib 0.1.3 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate crates.io crate grep_cdylib 0.1.3 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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded anyhow v1.0.55
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 22626a263666083b996bb054cc9c7f06d23d7ef64028a14f009a520892779236
[INFO] running `Command { std: "docker" "start" "-a" "22626a263666083b996bb054cc9c7f06d23d7ef64028a14f009a520892779236", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "22626a263666083b996bb054cc9c7f06d23d7ef64028a14f009a520892779236", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22626a263666083b996bb054cc9c7f06d23d7ef64028a14f009a520892779236", kill_on_drop: false }`
[INFO] [stdout] 22626a263666083b996bb054cc9c7f06d23d7ef64028a14f009a520892779236
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6d156b35ddaaca7fdd2fe760f2fcfa3f960644dc228c11b108d353a1611c32fd
[INFO] running `Command { std: "docker" "start" "-a" "6d156b35ddaaca7fdd2fe760f2fcfa3f960644dc228c11b108d353a1611c32fd", kill_on_drop: false }`
[INFO] [stderr]    Compiling anyhow v1.0.55
[INFO] [stderr]     Checking libloading v0.7.3
[INFO] [stderr]     Checking grep_cdylib v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: found module declaration for lib.rs
[INFO] [stdout]   --> examples/grep_extern/main.rs:57:1
[INFO] [stdout]    |
[INFO] [stdout] 57 | mod lib;
[INFO] [stdout]    | ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: lib.rs is the root of this crate's library target
[INFO] [stdout]    = help: to refer to it from other targets, use the library's name as the path
[INFO] [stdout]    = note: `#[warn(special_module_name)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Ok`, `BufferTooSmall`, and `End` are never constructed
[INFO] [stdout]   --> examples/grep_extern/interface.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 9  | pub enum GetStrResult {
[INFO] [stdout]    |          ------------ variants in this enum
[INFO] [stdout] 10 |     Ok,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 11 |     BufferTooSmall,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 12 |     End,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `lib` is never read
[INFO] [stdout]  --> examples/grep_extern/lib.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct Lib {
[INFO] [stdout]   |            --- field in this struct
[INFO] [stdout] 7 |     pub lib: Arc<Library>,
[INFO] [stdout]   |         ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Lib` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.06s
[INFO] running `Command { std: "docker" "inspect" "6d156b35ddaaca7fdd2fe760f2fcfa3f960644dc228c11b108d353a1611c32fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d156b35ddaaca7fdd2fe760f2fcfa3f960644dc228c11b108d353a1611c32fd", kill_on_drop: false }`
[INFO] [stdout] 6d156b35ddaaca7fdd2fe760f2fcfa3f960644dc228c11b108d353a1611c32fd