[INFO] fetching crate nano_arena 0.5.2...
[INFO] testing nano_arena-0.5.2 against try#dec9417b8611e34e787a3e4c37686b5131f9e5c5 for pr-154210-2
[INFO] extracting crate nano_arena 0.5.2 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate nano_arena 0.5.2
[INFO] finished tweaking crates.io crate nano_arena 0.5.2
[INFO] tweaked toml for crates.io crate nano_arena 0.5.2 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate nano_arena 0.5.2 on toolchain dec9417b8611e34e787a3e4c37686b5131f9e5c5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "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" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "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 63 packages to latest compatible versions
[INFO] [stderr]       Adding criterion v0.3.6 (available: v0.8.2)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0f218520c54a8a9e415ba7eb7e0f51a9e8916e364ef4102579e29f2421e85024
[INFO] running `Command { std: "docker" "start" "-a" "0f218520c54a8a9e415ba7eb7e0f51a9e8916e364ef4102579e29f2421e85024", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0f218520c54a8a9e415ba7eb7e0f51a9e8916e364ef4102579e29f2421e85024", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0f218520c54a8a9e415ba7eb7e0f51a9e8916e364ef4102579e29f2421e85024", kill_on_drop: false }`
[INFO] [stdout] 0f218520c54a8a9e415ba7eb7e0f51a9e8916e364ef4102579e29f2421e85024
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f4c12c5e60e163711c233760f23cf7f8a1697028428b44179d8bbf0684b8d780
[INFO] running `Command { std: "docker" "start" "-a" "f4c12c5e60e163711c233760f23cf7f8a1697028428b44179d8bbf0684b8d780", kill_on_drop: false }`
[INFO] [stderr]    Compiling nano_arena v0.5.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: eliding a lifetime that's named elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:226:18
[INFO] [stdout]     |
[INFO] [stdout] 224 |         &'a mut self,
[INFO] [stdout]     |          -- the lifetime is named here
[INFO] [stdout] 225 |         selected: I,
[INFO] [stdout] 226 |     ) -> Option<(&mut T, ArenaSplit<'a, T>)> {
[INFO] [stdout]     |                  ^^^^^^             -- the same lifetime is named here
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  the same 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: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 226 |     ) -> Option<(&'a mut T, ArenaSplit<'a, T>)> {
[INFO] [stdout]     |                   ++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.23s
[INFO] running `Command { std: "docker" "inspect" "f4c12c5e60e163711c233760f23cf7f8a1697028428b44179d8bbf0684b8d780", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4c12c5e60e163711c233760f23cf7f8a1697028428b44179d8bbf0684b8d780", kill_on_drop: false }`
[INFO] [stdout] f4c12c5e60e163711c233760f23cf7f8a1697028428b44179d8bbf0684b8d780
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d59348113d5165a6f7b036183a2c0b7f7356cad97f6e9db3f818f1b9f1fb5c54
[INFO] running `Command { std: "docker" "start" "-a" "d59348113d5165a6f7b036183a2c0b7f7356cad97f6e9db3f818f1b9f1fb5c54", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling memchr v2.8.0
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling libc v0.2.185
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling itertools v0.10.5
[INFO] [stderr]    Compiling ryu v1.0.23
[INFO] [stderr]    Compiling half v1.8.3
[INFO] [stderr]    Compiling clap v2.34.0
[INFO] [stderr]    Compiling csv-core v0.1.13
[INFO] [stderr]    Compiling criterion-plot v0.4.5
[INFO] [stderr]    Compiling rayon v1.12.0
[INFO] [stdout] warning: eliding a lifetime that's named elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:226:18
[INFO] [stdout]     |
[INFO] [stdout] 224 |         &'a mut self,
[INFO] [stdout]     |          -- the lifetime is named here
[INFO] [stdout] 225 |         selected: I,
[INFO] [stdout] 226 |     ) -> Option<(&mut T, ArenaSplit<'a, T>)> {
[INFO] [stdout]     |                  ^^^^^^             -- the same lifetime is named here
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  the same 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: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 226 |     ) -> Option<(&'a mut T, ArenaSplit<'a, T>)> {
[INFO] [stdout]     |                   ++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling plotters v0.3.7
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling serde_json v1.0.149
[INFO] [stderr]    Compiling csv v1.4.0
[INFO] [stderr]    Compiling serde_cbor v0.11.2
[INFO] [stderr]    Compiling tinytemplate v1.2.1
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling criterion v0.3.6
[INFO] [stderr]    Compiling nano_arena v0.5.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: eliding a lifetime that's named elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:226:18
[INFO] [stdout]     |
[INFO] [stdout] 224 |         &'a mut self,
[INFO] [stdout]     |          -- the lifetime is named here
[INFO] [stdout] 225 |         selected: I,
[INFO] [stdout] 226 |     ) -> Option<(&mut T, ArenaSplit<'a, T>)> {
[INFO] [stdout]     |                  ^^^^^^             -- the same lifetime is named here
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  the same 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: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 226 |     ) -> Option<(&'a mut T, ArenaSplit<'a, T>)> {
[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/lib.rs:760:9
[INFO] [stdout]     |
[INFO] [stdout] 760 |         drop(first_mut_ref);
[INFO] [stdout]     |         ^^^^^-------------^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&mut i32`
[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] 760 -         drop(first_mut_ref);
[INFO] [stdout] 760 +         let _ = first_mut_ref;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 16.27s
[INFO] running `Command { std: "docker" "inspect" "d59348113d5165a6f7b036183a2c0b7f7356cad97f6e9db3f818f1b9f1fb5c54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d59348113d5165a6f7b036183a2c0b7f7356cad97f6e9db3f818f1b9f1fb5c54", kill_on_drop: false }`
[INFO] [stdout] d59348113d5165a6f7b036183a2c0b7f7356cad97f6e9db3f818f1b9f1fb5c54
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f6817ff945923d51d16fbfd47370a59623c009dd62646f87557b009180aecb4a
[INFO] running `Command { std: "docker" "start" "-a" "f6817ff945923d51d16fbfd47370a59623c009dd62646f87557b009180aecb4a", kill_on_drop: false }`
[INFO] [stderr] warning: eliding a lifetime that's named elsewhere is confusing
[INFO] [stderr]    --> src/lib.rs:226:18
[INFO] [stderr]     |
[INFO] [stderr] 224 |         &'a mut self,
[INFO] [stderr]     |          -- the lifetime is named here
[INFO] [stderr] 225 |         selected: I,
[INFO] [stderr] 226 |     ) -> Option<(&mut T, ArenaSplit<'a, T>)> {
[INFO] [stderr]     |                  ^^^^^^             -- the same lifetime is named here
[INFO] [stderr]     |                  |
[INFO] [stderr]     |                  the same lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stderr] help: consistently use `'a`
[INFO] [stderr]     |
[INFO] [stderr] 226 |     ) -> Option<(&'a mut T, ArenaSplit<'a, T>)> {
[INFO] [stderr]     |                   ++
[INFO] [stderr] 
[INFO] [stderr] warning: `nano_arena` (lib) generated 1 warning (run `cargo fix --lib -p nano_arena` to apply 1 suggestion)
[INFO] [stderr] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stderr]    --> src/lib.rs:760:9
[INFO] [stderr]     |
[INFO] [stderr] 760 |         drop(first_mut_ref);
[INFO] [stderr]     |         ^^^^^-------------^
[INFO] [stderr]     |              |
[INFO] [stderr]     |              argument has type `&mut i32`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the expression or result
[INFO] [stderr]     |
[INFO] [stderr] 760 -         drop(first_mut_ref);
[INFO] [stderr] 760 +         let _ = first_mut_ref;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: `nano_arena` (lib test) generated 2 warnings (1 duplicate)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/nano_arena-d454baa135175396)
[INFO] [stdout] 
[INFO] [stdout] running 24 tests
[INFO] [stdout] test tests::arena_length ... ok
[INFO] [stdout] test tests::cloned_index_should_equal ... ok
[INFO] [stdout] test tests::compare_should_work_for_idx ... ok
[INFO] [stdout] test tests::get_mut ... ok
[INFO] [stdout] test tests::debug_printing ... ok
[INFO] [stdout] test tests::iter ... ok
[INFO] [stdout] test tests::convert_to_vec ... ok
[INFO] [stdout] test tests::getting_by_index ... ok
[INFO] [stdout] test tests::index_should_be_hashable ... ok
[INFO] [stdout] test tests::mut_iter ... ok
[INFO] [stdout] test tests::alloc_with_idx ... ok
[INFO] [stdout] test tests::apply_ordering ... ok
[INFO] [stdout] test tests::remove ... ok
[INFO] [stdout] test tests::remove_should_remove_last_value ... ok
[INFO] [stdout] test tests::retain ... ok
[INFO] [stdout] test tests::should_construct_with_capacity ... ok
[INFO] [stdout] test tests::splitting_should_be_safe ... ok
[INFO] [stdout] test tests::should_construct_default ... ok
[INFO] [stdout] test tests::turn_iterator_into_vector ... ok
[INFO] [stdout] test tests::swap_remove ... ok
[INFO] [stdout] test tests::swap_indexes ... ok
[INFO] [stdout] test tests::truncate ... ok
[INFO] [stdout] test tests::position ... ok
[INFO] [stdout] test tests::split_at ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 24 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests nano_arena
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f6817ff945923d51d16fbfd47370a59623c009dd62646f87557b009180aecb4a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f6817ff945923d51d16fbfd47370a59623c009dd62646f87557b009180aecb4a", kill_on_drop: false }`
[INFO] [stdout] f6817ff945923d51d16fbfd47370a59623c009dd62646f87557b009180aecb4a