[INFO] fetching crate async-coap 0.1.0...
[INFO] checking async-coap-0.1.0 against master#0d56e340472882fa673d4b98d0802b9a799879d0 for pr-101692
[INFO] extracting crate async-coap 0.1.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate async-coap 0.1.0 on toolchain 0d56e340472882fa673d4b98d0802b9a799879d0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0d56e340472882fa673d4b98d0802b9a799879d0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate async-coap 0.1.0
[INFO] finished tweaking crates.io crate async-coap 0.1.0
[INFO] tweaked toml for crates.io crate async-coap 0.1.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0d56e340472882fa673d4b98d0802b9a799879d0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0d56e340472882fa673d4b98d0802b9a799879d0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded futures-preview v0.3.0-alpha.18
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[INFO] [stderr]   Downloaded num v0.2.1
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[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@sha256:824c28ce115f6b999260af6986f3384c158e782489540e41c0b698ca1d9fd927" "/opt/rustwide/cargo-home/bin/cargo" "+0d56e340472882fa673d4b98d0802b9a799879d0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eb44fb662064e0a724cf318d376e9eee4cf300598b108470b7989cf0bf357537
[INFO] running `Command { std: "docker" "start" "-a" "eb44fb662064e0a724cf318d376e9eee4cf300598b108470b7989cf0bf357537", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eb44fb662064e0a724cf318d376e9eee4cf300598b108470b7989cf0bf357537", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb44fb662064e0a724cf318d376e9eee4cf300598b108470b7989cf0bf357537", kill_on_drop: false }`
[INFO] [stdout] eb44fb662064e0a724cf318d376e9eee4cf300598b108470b7989cf0bf357537
[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" "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@sha256:824c28ce115f6b999260af6986f3384c158e782489540e41c0b698ca1d9fd927" "/opt/rustwide/cargo-home/bin/cargo" "+0d56e340472882fa673d4b98d0802b9a799879d0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 134c72abcdc857ad9052f878442e0787ec46f3cfce8bd20ef97c64a328055f34
[INFO] running `Command { std: "docker" "start" "-a" "134c72abcdc857ad9052f878442e0787ec46f3cfce8bd20ef97c64a328055f34", kill_on_drop: false }`
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[INFO] [stderr]    Compiling libc v0.2.132
[INFO] [stderr]    Compiling memchr v2.5.0
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[INFO] [stderr]    Compiling syn v0.15.44
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[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
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[INFO] [stderr]     Checking ppv-lite86 v0.2.16
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]    Compiling regex-syntax v0.6.27
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[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking rand_core v0.5.1
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[INFO] [stderr]    Compiling async-coap-uri-macros v0.1.0
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[INFO] [stderr]     Checking futures-executor-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking futures-preview v0.3.0-alpha.18
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[INFO] [stderr]     Checking async-coap v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: warn(rust_2018_idioms) is ignored unless specified at crate level
[INFO] [stdout]    --> src/arc_guard.rs:115:54
[INFO] [stdout]     |
[INFO] [stdout] 115 | #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]
[INFO] [stdout]     |                                                      ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `async_await` has been stable since 1.39.0 and no longer requires an attribute to enable
[INFO] [stdout]    --> src/lib.rs:317:12
[INFO] [stdout]     |
[INFO] [stdout] 317 | #![feature(async_await)]
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: warn(rust_2018_idioms) is ignored unless specified at crate level
[INFO] [stdout]    --> src/arc_guard.rs:115:54
[INFO] [stdout]     |
[INFO] [stdout] 115 | #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]
[INFO] [stdout]     |                                                      ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `async_await` has been stable since 1.39.0 and no longer requires an attribute to enable
[INFO] [stdout]    --> src/lib.rs:317:12
[INFO] [stdout]     |
[INFO] [stdout] 317 | #![feature(async_await)]
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `option_start` is never read
[INFO] [stdout]   --> src/message/std_parser.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct StandardMessageParser<'buf> {
[INFO] [stdout]    |            --------------------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 31 |     option_start: usize,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout]    = note: `StandardMessageParser` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `option_start` is never read
[INFO] [stdout]   --> src/message/std_parser.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct StandardMessageParser<'buf> {
[INFO] [stdout]    |            --------------------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 31 |     option_start: usize,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout]    = note: `StandardMessageParser` has a derived impl for the trait `Debug`, 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 [unoptimized + debuginfo] target(s) in 10.75s
[INFO] running `Command { std: "docker" "inspect" "134c72abcdc857ad9052f878442e0787ec46f3cfce8bd20ef97c64a328055f34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "134c72abcdc857ad9052f878442e0787ec46f3cfce8bd20ef97c64a328055f34", kill_on_drop: false }`
[INFO] [stdout] 134c72abcdc857ad9052f878442e0787ec46f3cfce8bd20ef97c64a328055f34