[INFO] fetching crate mapreduce 0.1.0...
[INFO] checking mapreduce-0.1.0 against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] extracting crate mapreduce 0.1.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate mapreduce 0.1.0 on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4606a5e038c1681c235681c7dcf58ee3041adee1f26b0fb00128e347de606f37
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4606a5e038c1681c235681c7dcf58ee3041adee1f26b0fb00128e347de606f37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4606a5e038c1681c235681c7dcf58ee3041adee1f26b0fb00128e347de606f37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4606a5e038c1681c235681c7dcf58ee3041adee1f26b0fb00128e347de606f37", kill_on_drop: false }`
[INFO] [stdout] 4606a5e038c1681c235681c7dcf58ee3041adee1f26b0fb00128e347de606f37
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 4c2dae5f5aeb5ee6d01296bec78620dca120f1b014632f1afb37e98e4e56a621
[INFO] running `Command { std: "docker" "start" "-a" "4c2dae5f5aeb5ee6d01296bec78620dca120f1b014632f1afb37e98e4e56a621", 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]    |                                           ^^^^^^ help: use `dyn`: `dyn Writer`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[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 issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[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]    |                                              ^^^^^^ help: use `dyn`: `dyn Writer`
[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 issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[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]    |                                                       ^^^^^^ help: use `dyn`: `dyn Writer`
[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 issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[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: 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]    |                                           ^^^^^^ help: use `dyn`: `dyn Writer`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[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 issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[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]    |                                              ^^^^^^ help: use `dyn`: `dyn Writer`
[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 issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[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]    |                                                       ^^^^^^ help: use `dyn`: `dyn Writer`
[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 issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: private type `MapReduceOption` in public interface (error E0446)
[INFO] [stdout]   --> src/mapreduce.rs:16:1
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub type Option = fn(opts: &mut MapReduceOption);
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(private_in_public)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `drain`
[INFO] [stdout]   --> src/mapreduce.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn drain<T>(ch:Receiver<T>){
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[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: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: private type `MapReduceOption` in public interface (error E0446)
[INFO] [stdout]   --> src/mapreduce.rs:16:1
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub type Option = fn(opts: &mut MapReduceOption);
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(private_in_public)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `drain`
[INFO] [stdout]   --> src/mapreduce.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn drain<T>(ch:Receiver<T>){
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.42s
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "4c2dae5f5aeb5ee6d01296bec78620dca120f1b014632f1afb37e98e4e56a621", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c2dae5f5aeb5ee6d01296bec78620dca120f1b014632f1afb37e98e4e56a621", kill_on_drop: false }`
[INFO] [stdout] 4c2dae5f5aeb5ee6d01296bec78620dca120f1b014632f1afb37e98e4e56a621