[INFO] fetching crate futures-mockstream 0.1.2...
[INFO] checking futures-mockstream-0.1.2 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate futures-mockstream 0.1.2 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate futures-mockstream 0.1.2 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate futures-mockstream 0.1.2
[INFO] finished tweaking crates.io crate futures-mockstream 0.1.2
[INFO] tweaked toml for crates.io crate futures-mockstream 0.1.2 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 42 packages
[INFO] [stderr]       Adding async-channel v1.9.0 (latest: v2.2.0)
[INFO] [stderr]       Adding async-task v3.0.0 (latest: v4.7.0)
[INFO] [stderr]       Adding blocking v0.4.7 (latest: v1.5.1)
[INFO] [stderr]       Adding concurrent-queue v1.2.4 (latest: v2.4.0)
[INFO] [stderr]       Adding event-listener v2.5.3 (latest: v5.3.0)
[INFO] [stderr]       Adding fastrand v1.9.0 (latest: v2.0.2)
[INFO] [stderr]       Adding futures-lite v0.1.11 (latest: v2.3.0)
[INFO] [stderr]       Adding parking v1.0.6 (latest: v2.2.0)
[INFO] [stderr]       Adding pin-project-lite v0.1.12 (latest: v0.2.14)
[INFO] [stderr]       Adding smol v0.1.18 (latest: v2.0.0)
[INFO] [stderr]       Adding socket2 v0.3.19 (latest: v0.5.6)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded parking v1.0.6
[INFO] [stderr]   Downloaded futures-lite v0.1.11
[INFO] [stderr]   Downloaded blocking v0.4.7
[INFO] [stderr]   Downloaded async-task v3.0.0
[INFO] [stderr]   Downloaded wepoll-sys-stjepang v1.0.8
[INFO] [stderr]   Downloaded smol v0.1.18
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4e498c9c800a6f9ca58e72c1c6415564cdb14c6bf00619f3fc1bb7f6683d4e58
[INFO] running `Command { std: "docker" "start" "-a" "4e498c9c800a6f9ca58e72c1c6415564cdb14c6bf00619f3fc1bb7f6683d4e58", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4e498c9c800a6f9ca58e72c1c6415564cdb14c6bf00619f3fc1bb7f6683d4e58", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e498c9c800a6f9ca58e72c1c6415564cdb14c6bf00619f3fc1bb7f6683d4e58", kill_on_drop: false }`
[INFO] [stdout] 4e498c9c800a6f9ca58e72c1c6415564cdb14c6bf00619f3fc1bb7f6683d4e58
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4c4f4b651b70c4f0a06783a42347b8e35792ec6e1f14a32704f6d72d80d598fa
[INFO] running `Command { std: "docker" "start" "-a" "4c4f4b651b70c4f0a06783a42347b8e35792ec6e1f14a32704f6d72d80d598fa", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]     Checking futures-task v0.3.30
[INFO] [stderr]     Checking futures-lite v0.1.11
[INFO] [stderr]     Checking parking v1.0.6
[INFO] [stderr]     Checking async-task v3.0.0
[INFO] [stderr]     Checking scoped-tls v1.0.1
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking futures-mockstream v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `from_index` is never read
[INFO] [stdout]   --> src/lib.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub struct MockStream {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 29 |     buf: Cursor<Vec<u8>>,
[INFO] [stdout] 30 |     from_index: usize,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MockStream` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking blocking v0.4.7
[INFO] [stderr]     Checking socket2 v0.3.19
[INFO] [stderr]     Checking smol v0.1.18
[INFO] [stdout] warning: field `from_index` is never read
[INFO] [stdout]   --> src/lib.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub struct MockStream {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 29 |     buf: Cursor<Vec<u8>>,
[INFO] [stdout] 30 |     from_index: usize,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MockStream` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.47s
[INFO] running `Command { std: "docker" "inspect" "4c4f4b651b70c4f0a06783a42347b8e35792ec6e1f14a32704f6d72d80d598fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c4f4b651b70c4f0a06783a42347b8e35792ec6e1f14a32704f6d72d80d598fa", kill_on_drop: false }`
[INFO] [stdout] 4c4f4b651b70c4f0a06783a42347b8e35792ec6e1f14a32704f6d72d80d598fa