[INFO] fetching crate mapreduce 0.1.0...
[INFO] checking mapreduce-0.1.0 against master#350d0ef0ec0493e6d21cfb265cb8211a0e74d766 for pr-145342-1
[INFO] extracting crate mapreduce 0.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate mapreduce 0.1.0
[INFO] finished tweaking crates.io crate mapreduce 0.1.0
[INFO] tweaked toml for crates.io crate mapreduce 0.1.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate mapreduce 0.1.0 on toolchain 350d0ef0ec0493e6d21cfb265cb8211a0e74d766
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "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" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3e9f3397d85c2a8152c707b3d296f7fa77fb3dc9a52ef1dbacdb6dcedf3ccc61
[INFO] running `Command { std: "docker" "start" "-a" "3e9f3397d85c2a8152c707b3d296f7fa77fb3dc9a52ef1dbacdb6dcedf3ccc61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3e9f3397d85c2a8152c707b3d296f7fa77fb3dc9a52ef1dbacdb6dcedf3ccc61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3e9f3397d85c2a8152c707b3d296f7fa77fb3dc9a52ef1dbacdb6dcedf3ccc61", kill_on_drop: false }`
[INFO] [stdout] 3e9f3397d85c2a8152c707b3d296f7fa77fb3dc9a52ef1dbacdb6dcedf3ccc61
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 55221b398fa6e51bb4ad438ef4a8c92593c821bdfbf0ca45a335897f5bad6dfe
[INFO] running `Command { std: "docker" "start" "-a" "55221b398fa6e51bb4ad438ef4a8c92593c821bdfbf0ca45a335897f5bad6dfe", kill_on_drop: false }`
[INFO] [stderr]     Checking mapreduce v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/mapreduce.rs:11:43
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub type MapFunc<T> = fn(item: T, writer: Writer);
[INFO] [stdout]    |                                           ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub type MapFunc<T> = fn(item: T, writer: dyn Writer);
[INFO] [stdout]    |                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/mapreduce.rs:13:46
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub type MapperFunc<T> = fn(item: T, writer: Writer, cancel: fn(Error));
[INFO] [stdout]    |                                              ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub type MapperFunc<T> = fn(item: T, writer: dyn Writer, cancel: fn(Error));
[INFO] [stdout]    |                                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/mapreduce.rs:14:55
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub type ReducerFunc<T> = fn(pipe: Sender<T>, writer: Writer, cancel: fn(Error));
[INFO] [stdout]    |                                                       ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub type ReducerFunc<T> = fn(pipe: Sender<T>, writer: dyn Writer, cancel: fn(Error));
[INFO] [stdout]    |                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/mapreduce.rs:11:43
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub type MapFunc<T> = fn(item: T, writer: Writer);
[INFO] [stdout]    |                                           ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub type MapFunc<T> = fn(item: T, writer: dyn Writer);
[INFO] [stdout]    |                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/mapreduce.rs:13:46
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub type MapperFunc<T> = fn(item: T, writer: Writer, cancel: fn(Error));
[INFO] [stdout]    |                                              ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub type MapperFunc<T> = fn(item: T, writer: dyn Writer, cancel: fn(Error));
[INFO] [stdout]    |                                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/mapreduce.rs:14:55
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub type ReducerFunc<T> = fn(pipe: Sender<T>, writer: Writer, cancel: fn(Error));
[INFO] [stdout]    |                                                       ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub type ReducerFunc<T> = fn(pipe: Sender<T>, writer: dyn Writer, cancel: fn(Error));
[INFO] [stdout]    |                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ch`
[INFO] [stdout]   --> src/mapreduce.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn drain<T>(ch:Receiver<T>){
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_ch`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `MapReduceOption` is more private than the item `mapreduce::Option`
[INFO] [stdout]   --> src/mapreduce.rs:16:1
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub type Option = fn(opts: &mut MapReduceOption);
[INFO] [stdout]    | ^^^^^^^^^^^^^^^ type alias `mapreduce::Option` is reachable at visibility `pub`
[INFO] [stdout]    |
[INFO] [stdout] note: but type `MapReduceOption` is only usable at visibility `pub(self)`
[INFO] [stdout]   --> src/mapreduce.rs:23:1
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct MapReduceOption {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `worker` is never read
[INFO] [stdout]   --> src/mapreduce.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct MapReduceOption {
[INFO] [stdout]    |        --------------- field in this struct
[INFO] [stdout] 24 |     worker: i32
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MapReduceOption` 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: function `drain` is never used
[INFO] [stdout]   --> src/mapreduce.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn drain<T>(ch:Receiver<T>){
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ch`
[INFO] [stdout]   --> src/mapreduce.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn drain<T>(ch:Receiver<T>){
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_ch`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `MapReduceOption` is more private than the item `mapreduce::Option`
[INFO] [stdout]   --> src/mapreduce.rs:16:1
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub type Option = fn(opts: &mut MapReduceOption);
[INFO] [stdout]    | ^^^^^^^^^^^^^^^ type alias `mapreduce::Option` is reachable at visibility `pub`
[INFO] [stdout]    |
[INFO] [stdout] note: but type `MapReduceOption` is only usable at visibility `pub(self)`
[INFO] [stdout]   --> src/mapreduce.rs:23:1
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct MapReduceOption {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `worker` is never read
[INFO] [stdout]   --> src/mapreduce.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct MapReduceOption {
[INFO] [stdout]    |        --------------- field in this struct
[INFO] [stdout] 24 |     worker: i32
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MapReduceOption` 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: function `drain` is never used
[INFO] [stdout]   --> src/mapreduce.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn drain<T>(ch:Receiver<T>){
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.29s
[INFO] running `Command { std: "docker" "inspect" "55221b398fa6e51bb4ad438ef4a8c92593c821bdfbf0ca45a335897f5bad6dfe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "55221b398fa6e51bb4ad438ef4a8c92593c821bdfbf0ca45a335897f5bad6dfe", kill_on_drop: false }`
[INFO] [stdout] 55221b398fa6e51bb4ad438ef4a8c92593c821bdfbf0ca45a335897f5bad6dfe