[INFO] fetching crate twiggy-traits 0.7.0...
[INFO] checking twiggy-traits-0.7.0 against try#cac44d9528e3bbbdaa1537d187bd489ccc5de18c for pr-91141
[INFO] extracting crate twiggy-traits 0.7.0 into /workspace/builds/worker-35/source
[INFO] validating manifest of crates.io crate twiggy-traits 0.7.0 on toolchain cac44d9528e3bbbdaa1537d187bd489ccc5de18c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate twiggy-traits 0.7.0
[INFO] finished tweaking crates.io crate twiggy-traits 0.7.0
[INFO] tweaked toml for crates.io crate twiggy-traits 0.7.0 written to /workspace/builds/worker-35/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "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-35/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-35/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bb296b34db88983b034d077c8718f35a850f316de702b19ef6d0ca02cc205c41
[INFO] running `Command { std: "docker" "start" "-a" "bb296b34db88983b034d077c8718f35a850f316de702b19ef6d0ca02cc205c41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bb296b34db88983b034d077c8718f35a850f316de702b19ef6d0ca02cc205c41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb296b34db88983b034d077c8718f35a850f316de702b19ef6d0ca02cc205c41", kill_on_drop: false }`
[INFO] [stdout] bb296b34db88983b034d077c8718f35a850f316de702b19ef6d0ca02cc205c41
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-35/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-35/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f9e6e2c2889314ffc2a761ca46de0410cd69def51103b27996a081f90525b88e
[INFO] running `Command { std: "docker" "start" "-a" "f9e6e2c2889314ffc2a761ca46de0410cd69def51103b27996a081f90525b88e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling cc v1.0.72
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling ryu v1.0.6
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]     Checking rustc-demangle v0.1.21
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling cpp_demangle v0.3.4
[INFO] [stderr]     Checking gimli v0.26.1
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]     Checking fixedbitset v0.4.0
[INFO] [stderr]     Checking frozen v1.0.0
[INFO] [stderr]     Checking itoa v0.4.8
[INFO] [stderr]     Checking wasmparser v0.35.3
[INFO] [stderr]    Compiling backtrace v0.3.63
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]     Checking object v0.27.1
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking petgraph v0.6.0
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking addr2line v0.17.0
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking csv v1.1.6
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking twiggy-ir v0.7.0
[INFO] [stderr]     Checking twiggy-traits v0.7.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `items`
[INFO] [stdout]    --> traits.rs:224:9
[INFO] [stdout]     |
[INFO] [stdout] 224 |         items: &ir::Items,
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_items`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `destination`
[INFO] [stdout]    --> traits.rs:225:9
[INFO] [stdout]     |
[INFO] [stdout] 225 |         destination: &mut dyn io::Write,
[INFO] [stdout]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_destination`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `items`
[INFO] [stdout]    --> traits.rs:224:9
[INFO] [stdout]     |
[INFO] [stdout] 224 |         items: &ir::Items,
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_items`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `destination`
[INFO] [stdout]    --> traits.rs:225:9
[INFO] [stdout]     |
[INFO] [stdout] 225 |         destination: &mut dyn io::Write,
[INFO] [stdout]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_destination`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 19.97s
[INFO] running `Command { std: "docker" "inspect" "f9e6e2c2889314ffc2a761ca46de0410cd69def51103b27996a081f90525b88e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9e6e2c2889314ffc2a761ca46de0410cd69def51103b27996a081f90525b88e", kill_on_drop: false }`
[INFO] [stdout] f9e6e2c2889314ffc2a761ca46de0410cd69def51103b27996a081f90525b88e