[INFO] fetching crate grep_cdylib 0.1.3...
[INFO] checking grep_cdylib-0.1.3 against try#7014e13d5becc920d4bea3cd87942c8a13d359bf+rustflags=-Dtail_expr_drop_order for pr-129864
[INFO] extracting crate grep_cdylib 0.1.3 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate grep_cdylib 0.1.3 on toolchain 7014e13d5becc920d4bea3cd87942c8a13d359bf
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "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-6-tc2/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" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9ace4d655972127de9676771ba2df79b91d9c3fd81fd63d9929978b5c2662cfd
[INFO] running `Command { std: "docker" "start" "-a" "9ace4d655972127de9676771ba2df79b91d9c3fd81fd63d9929978b5c2662cfd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9ace4d655972127de9676771ba2df79b91d9c3fd81fd63d9929978b5c2662cfd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ace4d655972127de9676771ba2df79b91d9c3fd81fd63d9929978b5c2662cfd", kill_on_drop: false }`
[INFO] [stdout] 9ace4d655972127de9676771ba2df79b91d9c3fd81fd63d9929978b5c2662cfd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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 -Dtail_expr_drop_order" "-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5ac063afbfae47a53d2004046e6892437c66597ba21c3fa6ff35c9a189084bc3
[INFO] running `Command { std: "docker" "start" "-a" "5ac063afbfae47a53d2004046e6892437c66597ba21c3fa6ff35c9a189084bc3", kill_on_drop: false }`
[INFO] [stderr]    Compiling anyhow v1.0.55
[INFO] [stderr]     Checking grep_cdylib v0.1.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking libloading v0.7.3
[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 0.86s
[INFO] running `Command { std: "docker" "inspect" "5ac063afbfae47a53d2004046e6892437c66597ba21c3fa6ff35c9a189084bc3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5ac063afbfae47a53d2004046e6892437c66597ba21c3fa6ff35c9a189084bc3", kill_on_drop: false }`
[INFO] [stdout] 5ac063afbfae47a53d2004046e6892437c66597ba21c3fa6ff35c9a189084bc3