[INFO] fetching crate microstack 0.0.7...
[INFO] checking microstack-0.0.7 against try#a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d for pr-145342-1
[INFO] extracting crate microstack 0.0.7 into /workspace/builds/worker-3-tc2/source
[INFO] started tweaking crates.io crate microstack 0.0.7
[INFO] finished tweaking crates.io crate microstack 0.0.7
[INFO] tweaked toml for crates.io crate microstack 0.0.7 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate microstack 0.0.7 on toolchain a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 7 packages to latest compatible versions
[INFO] [stderr]       Adding bincode v1.3.3 (available: v2.0.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d62771407b572256bc46a3e56261cd7d689b9dd7cb29d13f0b9006da4dcbba9e
[INFO] running `Command { std: "docker" "start" "-a" "d62771407b572256bc46a3e56261cd7d689b9dd7cb29d13f0b9006da4dcbba9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d62771407b572256bc46a3e56261cd7d689b9dd7cb29d13f0b9006da4dcbba9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d62771407b572256bc46a3e56261cd7d689b9dd7cb29d13f0b9006da4dcbba9e", kill_on_drop: false }`
[INFO] [stdout] d62771407b572256bc46a3e56261cd7d689b9dd7cb29d13f0b9006da4dcbba9e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 60a60feaf91a7d10873d17c953d65584014df610458327183df87d9afe0c7632
[INFO] running `Command { std: "docker" "start" "-a" "60a60feaf91a7d10873d17c953d65584014df610458327183df87d9afe0c7632", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]     Checking microstack v0.0.7 (/opt/rustwide/workdir)
[INFO] [stdout] error: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]   --> src/clone.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     #[must_use]
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/lib.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 | #![deny(warnings)]
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    = note: `#[deny(unused_attributes)]` implied by `#[deny(warnings)]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]   --> src/ctors.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     #[must_use]
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]   --> src/iterators.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     #[must_use]
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]   --> src/iterators.rs:56:5
[INFO] [stdout]    |
[INFO] [stdout] 56 |     #[must_use]
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/iterators.rs:73:23
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub const fn iter(&self) -> Iter<V, N> {
[INFO] [stdout]    |                       ^^^^^     ---------- the same lifetime is hidden here
[INFO] [stdout]    |                       |
[INFO] [stdout]    |                       the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[deny(mismatched_lifetime_syntaxes)]` implied by `#[deny(warnings)]`
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub const fn iter(&self) -> Iter<'_, V, N> {
[INFO] [stdout]    |                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `microstack` (lib) due to 5 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "60a60feaf91a7d10873d17c953d65584014df610458327183df87d9afe0c7632", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "60a60feaf91a7d10873d17c953d65584014df610458327183df87d9afe0c7632", kill_on_drop: false }`
[INFO] [stdout] 60a60feaf91a7d10873d17c953d65584014df610458327183df87d9afe0c7632