[INFO] cloning repository https://github.com/kunal171/libp2p_learning
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kunal171/libp2p_learning" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkunal171%2Flibp2p_learning", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkunal171%2Flibp2p_learning'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a0d1a4793ec6dc30095c766adf9d6210adada6db
[INFO] checking kunal171/libp2p_learning against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkunal171%2Flibp2p_learning" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/kunal171/libp2p_learning
[INFO] finished tweaking git repo https://github.com/kunal171/libp2p_learning
[INFO] tweaked toml for git repo https://github.com/kunal171/libp2p_learning written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/kunal171/libp2p_learning on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/kunal171/libp2p_learning 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 414f73023321fdd843d803186f0fde197d922ded6e13ef8e606cd624a1ea231f
[INFO] running `Command { std: "docker" "start" "-a" "414f73023321fdd843d803186f0fde197d922ded6e13ef8e606cd624a1ea231f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "414f73023321fdd843d803186f0fde197d922ded6e13ef8e606cd624a1ea231f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "414f73023321fdd843d803186f0fde197d922ded6e13ef8e606cd624a1ea231f", kill_on_drop: false }`
[INFO] [stdout] 414f73023321fdd843d803186f0fde197d922ded6e13ef8e606cd624a1ea231f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d81a5528802a3be3cf76ce8a91bb56bc521d40a8e6b2d78aaa1c3ffd19ef9f5c
[INFO] running `Command { std: "docker" "start" "-a" "d81a5528802a3be3cf76ce8a91bb56bc521d40a8e6b2d78aaa1c3ffd19ef9f5c", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.72
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[INFO] [stderr]    Compiling enum-as-inner v0.6.0
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[INFO] [stderr]     Checking libp2p-tls v0.2.1
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[INFO] [stderr]     Checking libp2p-tcp v0.40.1
[INFO] [stderr]     Checking libp2p-swarm v0.43.7
[INFO] [stderr]     Checking trust-dns-resolver v0.23.2
[INFO] [stderr]     Checking libp2p-connection-limits v0.2.1
[INFO] [stderr]     Checking libp2p-ping v0.43.1
[INFO] [stderr]     Checking libp2p-allow-block-list v0.2.0
[INFO] [stderr]     Checking async-std-resolver v0.23.2
[INFO] [stderr]     Checking libp2p-dns v0.40.1
[INFO] [stderr]     Checking libp2p v0.52.4
[INFO] [stderr]     Checking libp2p-learnings v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, Infallible>, libp2p::SwarmBuilder<libp2p::builder::phase::provider::AsyncStd, libp2p::builder::phase::swarm::SwarmPhase<impl libp2p::builder::phase::AuthenticatedMultiplexedTransport, libp2p::libp2p_ping::Behaviour>>>
[INFO] [stdout]   --> src/main.rs:12:21
[INFO] [stdout]    |
[INFO] [stdout] 12 |       let mut swarm = libp2p::SwarmBuilder::with_new_identity()
[INFO] [stdout]    |  _____________________^
[INFO] [stdout] 13 | |         .with_async_std()
[INFO] [stdout] 14 | |         .with_tcp(
[INFO] [stdout] 15 | |             libp2p::tcp::Config::default(),
[INFO] [stdout] ...  |
[INFO] [stdout] 18 | |         )?
[INFO] [stdout] 19 | |         .with_behaviour(|_| ping::Behaviour::default())?
[INFO] [stdout]    | |________________________________________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<libp2p::SwarmBuilder<libp2p::builder::phase::provider::AsyncStd, libp2p::builder::phase::swarm::SwarmPhase<impl libp2p::builder::phase::AuthenticatedMultiplexedTransport, libp2p::libp2p_ping::Behaviour>>, Infallible>
[INFO] [stdout]   --> src/main.rs:12:21
[INFO] [stdout]    |
[INFO] [stdout] 12 |       let mut swarm = libp2p::SwarmBuilder::with_new_identity()
[INFO] [stdout]    |  _____________________^
[INFO] [stdout] 13 | |         .with_async_std()
[INFO] [stdout] 14 | |         .with_tcp(
[INFO] [stdout] 15 | |             libp2p::tcp::Config::default(),
[INFO] [stdout] ...  |
[INFO] [stdout] 18 | |         )?
[INFO] [stdout] 19 | |         .with_behaviour(|_| ping::Behaviour::default())?
[INFO] [stdout]    | |_______________________________________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `libp2p-learnings` (bin "libp2p-learnings" test) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `libp2p-learnings` (bin "libp2p-learnings") due to 2 previous errors
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, Infallible>, libp2p::SwarmBuilder<libp2p::builder::phase::provider::AsyncStd, libp2p::builder::phase::swarm::SwarmPhase<impl libp2p::builder::phase::AuthenticatedMultiplexedTransport, libp2p::libp2p_ping::Behaviour>>>
[INFO] [stdout]   --> src/main.rs:12:21
[INFO] [stdout]    |
[INFO] [stdout] 12 |       let mut swarm = libp2p::SwarmBuilder::with_new_identity()
[INFO] [stdout]    |  _____________________^
[INFO] [stdout] 13 | |         .with_async_std()
[INFO] [stdout] 14 | |         .with_tcp(
[INFO] [stdout] 15 | |             libp2p::tcp::Config::default(),
[INFO] [stdout] ...  |
[INFO] [stdout] 18 | |         )?
[INFO] [stdout] 19 | |         .with_behaviour(|_| ping::Behaviour::default())?
[INFO] [stdout]    | |________________________________________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<libp2p::SwarmBuilder<libp2p::builder::phase::provider::AsyncStd, libp2p::builder::phase::swarm::SwarmPhase<impl libp2p::builder::phase::AuthenticatedMultiplexedTransport, libp2p::libp2p_ping::Behaviour>>, Infallible>
[INFO] [stdout]   --> src/main.rs:12:21
[INFO] [stdout]    |
[INFO] [stdout] 12 |       let mut swarm = libp2p::SwarmBuilder::with_new_identity()
[INFO] [stdout]    |  _____________________^
[INFO] [stdout] 13 | |         .with_async_std()
[INFO] [stdout] 14 | |         .with_tcp(
[INFO] [stdout] 15 | |             libp2p::tcp::Config::default(),
[INFO] [stdout] ...  |
[INFO] [stdout] 18 | |         )?
[INFO] [stdout] 19 | |         .with_behaviour(|_| ping::Behaviour::default())?
[INFO] [stdout]    | |_______________________________________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "d81a5528802a3be3cf76ce8a91bb56bc521d40a8e6b2d78aaa1c3ffd19ef9f5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d81a5528802a3be3cf76ce8a91bb56bc521d40a8e6b2d78aaa1c3ffd19ef9f5c", kill_on_drop: false }`
[INFO] [stdout] d81a5528802a3be3cf76ce8a91bb56bc521d40a8e6b2d78aaa1c3ffd19ef9f5c
