[INFO] fetching crate flowclib 0.8.8...
[INFO] checking flowclib-0.8.8 against try#ffa4a0215752773248fb0f0a8092f1c3e7907e9e for pr-75585
[INFO] extracting crate flowclib 0.8.8 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate flowclib 0.8.8 on toolchain ffa4a0215752773248fb0f0a8092f1c3e7907e9e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate flowclib 0.8.8
[INFO] finished tweaking crates.io crate flowclib 0.8.8
[INFO] tweaked toml for crates.io crate flowclib 0.8.8 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f9cdcedb3dad0e18c206ddab030e909b707c580be86cd24740d0a649a0dd8f7d
[INFO] running `Command { std: "docker" "start" "-a" "f9cdcedb3dad0e18c206ddab030e909b707c580be86cd24740d0a649a0dd8f7d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f9cdcedb3dad0e18c206ddab030e909b707c580be86cd24740d0a649a0dd8f7d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9cdcedb3dad0e18c206ddab030e909b707c580be86cd24740d0a649a0dd8f7d", kill_on_drop: false }`
[INFO] [stdout] f9cdcedb3dad0e18c206ddab030e909b707c580be86cd24740d0a649a0dd8f7d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ce6b865aee479c6f46704687fe7c75e7bf1ef4eeabad63a18326ff2a7bc5b6ea
[INFO] running `Command { std: "docker" "start" "-a" "ce6b865aee479c6f46704687fe7c75e7bf1ef4eeabad63a18326ff2a7bc5b6ea", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.76
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]     Checking gimli v0.22.0
[INFO] [stderr]     Checking object v0.20.0
[INFO] [stderr]     Checking rustc-demangle v0.1.16
[INFO] [stderr]    Compiling either v1.6.0
[INFO] [stderr]     Checking memory_units v0.3.0
[INFO] [stderr]     Checking tinyvec v0.3.4
[INFO] [stderr]     Checking dtoa v0.4.6
[INFO] [stderr]     Checking strfmt v0.1.6
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]     Checking miniz_oxide v0.4.1
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking parity-wasm v0.31.3
[INFO] [stderr]    Compiling itertools v0.8.2
[INFO] [stderr]     Checking unicode-normalization v0.1.13
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]     Checking wasmi-validation v0.1.0
[INFO] [stderr]     Checking instant v0.1.6
[INFO] [stderr]     Checking tempdir v0.3.7
[INFO] [stderr]     Checking wasmi v0.4.5
[INFO] [stderr]     Checking url v2.1.1
[INFO] [stderr]     Checking addr2line v0.13.0
[INFO] [stderr]     Checking backtrace v0.3.50
[INFO] [stderr]     Checking error-chain v0.12.4
[INFO] [stderr]     Checking serde_json v1.0.57
[INFO] [stderr]     Checking multimap v0.5.0
[INFO] [stderr]     Checking toml v0.4.10
[INFO] [stderr]     Checking erased-serde v0.3.12
[INFO] [stderr]     Checking serde_yaml v0.8.13
[INFO] [stderr]     Checking flow_impl v0.8.5
[INFO] [stderr]    Compiling serde_derive v1.0.115
[INFO] [stderr]    Compiling shrinkwraprs v0.2.3
[INFO] [stderr]     Checking flowrlib v0.8.8
[INFO] [stderr]     Checking flowclib v0.8.8 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/model/flow.rs:320:9
[INFO] [stdout]     |
[INFO] [stdout] 320 |         replace(&mut self.connections, Some(connections));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/model/flow.rs:320:9
[INFO] [stdout]     |
[INFO] [stdout] 320 |         replace(&mut self.connections, Some(connections));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 12s
[INFO] running `Command { std: "docker" "inspect" "ce6b865aee479c6f46704687fe7c75e7bf1ef4eeabad63a18326ff2a7bc5b6ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce6b865aee479c6f46704687fe7c75e7bf1ef4eeabad63a18326ff2a7bc5b6ea", kill_on_drop: false }`
[INFO] [stdout] ce6b865aee479c6f46704687fe7c75e7bf1ef4eeabad63a18326ff2a7bc5b6ea