[INFO] fetching crate ouroboros_examples 0.18.4...
[INFO] checking ouroboros_examples-0.18.4 against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] extracting crate ouroboros_examples 0.18.4 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate ouroboros_examples 0.18.4 on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ouroboros_examples 0.18.4
[INFO] finished tweaking crates.io crate ouroboros_examples 0.18.4
[INFO] tweaked toml for crates.io crate ouroboros_examples 0.18.4 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 52 packages to latest compatible versions
[INFO] [stderr]       Adding addr2line v0.22.0 (latest: v0.24.1)
[INFO] [stderr]       Adding gimli v0.29.0 (latest: v0.31.0)
[INFO] [stderr]       Adding heck v0.4.1 (latest: v0.5.0)
[INFO] [stderr]       Adding itertools v0.12.1 (latest: v0.13.0)
[INFO] [stderr]       Adding miniz_oxide v0.7.4 (latest: v0.8.0)
[INFO] [stderr]       Adding trybuild v1.0.85 (latest: v1.0.99)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded trybuild v1.0.85
[INFO] [stderr]   Downloaded ouroboros_macro v0.18.4
[INFO] [stderr]   Downloaded ouroboros v0.18.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eeeecd54fa492555a1b35ce86c93baa3282d1a3cae6df25522ffc00d73dfd8af
[INFO] running `Command { std: "docker" "start" "-a" "eeeecd54fa492555a1b35ce86c93baa3282d1a3cae6df25522ffc00d73dfd8af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eeeecd54fa492555a1b35ce86c93baa3282d1a3cae6df25522ffc00d73dfd8af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eeeecd54fa492555a1b35ce86c93baa3282d1a3cae6df25522ffc00d73dfd8af", kill_on_drop: false }`
[INFO] [stdout] eeeecd54fa492555a1b35ce86c93baa3282d1a3cae6df25522ffc00d73dfd8af
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b45d68ee07bbf926bf81f406e5caa57cea9ed9066110c542c5d308fc91efc198
[INFO] running `Command { std: "docker" "start" "-a" "b45d68ee07bbf926bf81f406e5caa57cea9ed9066110c542c5d308fc91efc198", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.209
[INFO] [stderr]    Compiling yansi v1.0.1
[INFO] [stderr]    Compiling either v1.13.0
[INFO] [stderr]    Compiling proc-macro2-diagnostics v0.10.1
[INFO] [stderr]     Checking aliasable v0.1.3
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]    Compiling trybuild v1.0.85
[INFO] [stderr]    Compiling tokio-macros v2.4.0
[INFO] [stderr]    Compiling itertools v0.12.1
[INFO] [stderr]     Checking tokio v1.39.3
[INFO] [stderr]    Compiling ouroboros_macro v0.18.4
[INFO] [stderr]     Checking ouroboros v0.18.4
[INFO] [stderr]     Checking basic-toml v0.1.9
[INFO] [stderr]     Checking serde_json v1.0.127
[INFO] [stderr]     Checking ouroboros_examples v0.18.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/lib.rs:11:43
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct Ext<'this, T, const REV: bool>(&'this Box<T>);
[INFO] [stdout]    |            --- field in this struct       ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/lib.rs:11:43
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct Ext<'this, T, const REV: bool>(&'this Box<T>);
[INFO] [stdout]    |            --- field in this struct       ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/ok_tests.rs:259:5
[INFO] [stdout]     |
[INFO] [stdout] 259 |     drop(instance.borrow_external());
[INFO] [stdout]     |     ^^^^^--------------------------^
[INFO] [stdout]     |          |
[INFO] [stdout]     |          argument has type `&&str`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 259 -     drop(instance.borrow_external());
[INFO] [stdout] 259 +     let _ = instance.borrow_external();
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/ok_tests.rs:260:5
[INFO] [stdout]     |
[INFO] [stdout] 260 |     drop(instance.borrow_internal());
[INFO] [stdout]     |     ^^^^^--------------------------^
[INFO] [stdout]     |          |
[INFO] [stdout]     |          argument has type `&&&str`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 260 -     drop(instance.borrow_internal());
[INFO] [stdout] 260 +     let _ = instance.borrow_internal();
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.31s
[INFO] running `Command { std: "docker" "inspect" "b45d68ee07bbf926bf81f406e5caa57cea9ed9066110c542c5d308fc91efc198", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b45d68ee07bbf926bf81f406e5caa57cea9ed9066110c542c5d308fc91efc198", kill_on_drop: false }`
[INFO] [stdout] b45d68ee07bbf926bf81f406e5caa57cea9ed9066110c542c5d308fc91efc198