[INFO] fetching crate observer 0.2.5...
[INFO] checking observer-0.2.5 against master#c5fbcd35a8217a17f6b63a22217ace06cf8f5f02 for pr-86194
[INFO] extracting crate observer 0.2.5 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate observer 0.2.5 on toolchain c5fbcd35a8217a17f6b63a22217ace06cf8f5f02
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c5fbcd35a8217a17f6b63a22217ace06cf8f5f02" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate observer 0.2.5
[INFO] finished tweaking crates.io crate observer 0.2.5
[INFO] tweaked toml for crates.io crate observer 0.2.5 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c5fbcd35a8217a17f6b63a22217ace06cf8f5f02" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c5fbcd35a8217a17f6b63a22217ace06cf8f5f02" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+c5fbcd35a8217a17f6b63a22217ace06cf8f5f02" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0d3d1ab354e22f29338fe538221d579cdb10c43ffb741798ee80ddd0fd901ee9
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "0d3d1ab354e22f29338fe538221d579cdb10c43ffb741798ee80ddd0fd901ee9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0d3d1ab354e22f29338fe538221d579cdb10c43ffb741798ee80ddd0fd901ee9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d3d1ab354e22f29338fe538221d579cdb10c43ffb741798ee80ddd0fd901ee9", kill_on_drop: false }`
[INFO] [stdout] 0d3d1ab354e22f29338fe538221d579cdb10c43ffb741798ee80ddd0fd901ee9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+c5fbcd35a8217a17f6b63a22217ace06cf8f5f02" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 57e5e0dd99e252110eacb6f0e88fb1e0f387810ce131ea630aa2ee1128632fc5
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "57e5e0dd99e252110eacb6f0e88fb1e0f387810ce131ea630aa2ee1128632fc5", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.97
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]    Compiling typenum v1.13.0
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]    Compiling strsim v0.7.0
[INFO] [stderr]    Compiling cc v1.0.68
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking linked-hash-map v0.5.4
[INFO] [stderr]     Checking gimli v0.24.0
[INFO] [stderr]     Checking dtoa v0.4.8
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking rustc-demangle v0.1.19
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]    Compiling itoa v0.4.7
[INFO] [stderr]     Checking opaque-debug v0.3.0
[INFO] [stderr]     Checking cpufeatures v0.1.4
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]     Checking lock_api v0.4.4
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking instant v0.1.9
[INFO] [stderr]     Checking unsafe-any v0.4.2
[INFO] [stderr]     Checking yaml-rust v0.4.5
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]     Checking log v0.4.14
[INFO] [stderr]     Checking typemap v0.3.3
[INFO] [stderr]     Checking serde_yaml v0.8.17
[INFO] [stderr]     Checking sqlparser v0.5.1
[INFO] [stderr]     Checking object v0.25.3
[INFO] [stderr]     Checking parking_lot_core v0.8.3
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking parking_lot_core v0.7.2
[INFO] [stderr]     Checking thread-id v3.3.0
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking parking_lot v0.10.2
[INFO] [stderr]     Checking parking_lot v0.11.1
[INFO] [stderr]    Compiling backtrace v0.3.60
[INFO] [stderr]     Checking colored v1.9.3
[INFO] [stderr]     Checking uuid v0.8.2
[INFO] [stderr]     Checking flate2 v1.0.20
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking ordered-float v1.1.1
[INFO] [stderr]    Compiling syn v1.0.73
[INFO] [stderr]     Checking scheduled-thread-pool v0.2.5
[INFO] [stderr]     Checking serde-value v0.6.0
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]     Checking block-buffer v0.9.0
[INFO] [stderr]     Checking r2d2 v0.8.9
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking sha2 v0.9.5
[INFO] [stderr]     Checking addr2line v0.15.2
[INFO] [stderr]    Compiling darling_core v0.9.0
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling darling_macro v0.9.0
[INFO] [stderr]    Compiling diesel_derives v1.4.1
[INFO] [stderr]    Compiling darling v0.9.0
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking log4rs v0.11.0
[INFO] [stderr]    Compiling observer_attribute v0.1.8
[INFO] [stderr]     Checking diesel v1.4.7
[INFO] [stderr]     Checking r2d2-diesel v1.0.0
[INFO] [stderr]     Checking observer v0.2.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `stderr`
[INFO] [stdout]  --> src/backends/logger.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     stderr: bool,
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `stderr`
[INFO] [stdout]  --> src/backends/logger.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     stderr: bool,
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 49.75s
[INFO] running `Command { std: "docker" "inspect" "57e5e0dd99e252110eacb6f0e88fb1e0f387810ce131ea630aa2ee1128632fc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57e5e0dd99e252110eacb6f0e88fb1e0f387810ce131ea630aa2ee1128632fc5", kill_on_drop: false }`
[INFO] [stdout] 57e5e0dd99e252110eacb6f0e88fb1e0f387810ce131ea630aa2ee1128632fc5