[INFO] fetching crate rbtree 0.1.5...
[INFO] testing rbtree-0.1.5 against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] extracting crate rbtree 0.1.5 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate rbtree 0.1.5 on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rbtree 0.1.5
[INFO] finished tweaking crates.io crate rbtree 0.1.5
[INFO] tweaked toml for crates.io crate rbtree 0.1.5 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dbf772e9579bb88d7e417502c2c85c00cfd9ce5e4a3a4aa34154d8a2e4c9eada
[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" "dbf772e9579bb88d7e417502c2c85c00cfd9ce5e4a3a4aa34154d8a2e4c9eada", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dbf772e9579bb88d7e417502c2c85c00cfd9ce5e4a3a4aa34154d8a2e4c9eada", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dbf772e9579bb88d7e417502c2c85c00cfd9ce5e4a3a4aa34154d8a2e4c9eada", kill_on_drop: false }`
[INFO] [stdout] dbf772e9579bb88d7e417502c2c85c00cfd9ce5e4a3a4aa34154d8a2e4c9eada
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 077a53db945db7acc3cb0a6d9657e191832053b205fae34a28e924e273299b99
[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" "077a53db945db7acc3cb0a6d9657e191832053b205fae34a28e924e273299b99", kill_on_drop: false }`
[INFO] [stderr]    Compiling rbtree v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:491:34
[INFO] [stdout]     |
[INFO] [stdout] 491 |     fn next(&mut self) -> Option<(&'a K)> {
[INFO] [stdout]     |                                  ^     ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 491 -     fn next(&mut self) -> Option<(&'a K)> {
[INFO] [stdout] 491 +     fn next(&mut self) -> Option<&'a K> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:535:34
[INFO] [stdout]     |
[INFO] [stdout] 535 |     fn next(&mut self) -> Option<(&'a V)> {
[INFO] [stdout]     |                                  ^     ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 535 -     fn next(&mut self) -> Option<(&'a V)> {
[INFO] [stdout] 535 +     fn next(&mut self) -> Option<&'a V> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:581:34
[INFO] [stdout]     |
[INFO] [stdout] 581 |     fn next(&mut self) -> Option<(&'a mut V)> {
[INFO] [stdout]     |                                  ^         ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 581 -     fn next(&mut self) -> Option<(&'a mut V)> {
[INFO] [stdout] 581 +     fn next(&mut self) -> Option<&'a mut V> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::RBTree`
[INFO] [stdout]     --> src/lib.rs:1404:9
[INFO] [stdout]      |
[INFO] [stdout] 1404 |     use super::RBTree;
[INFO] [stdout]      |         ^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.45s
[INFO] running `Command { std: "docker" "inspect" "077a53db945db7acc3cb0a6d9657e191832053b205fae34a28e924e273299b99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "077a53db945db7acc3cb0a6d9657e191832053b205fae34a28e924e273299b99", kill_on_drop: false }`
[INFO] [stdout] 077a53db945db7acc3cb0a6d9657e191832053b205fae34a28e924e273299b99
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d249960334aac7ad4ba17a0b5d0f4ca45fdbff8606accf9c162ea019311bc1f5
[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" "d249960334aac7ad4ba17a0b5d0f4ca45fdbff8606accf9c162ea019311bc1f5", kill_on_drop: false }`
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:491:34
[INFO] [stdout]     |
[INFO] [stdout] 491 |     fn next(&mut self) -> Option<(&'a K)> {
[INFO] [stdout]     |                                  ^     ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 491 -     fn next(&mut self) -> Option<(&'a K)> {
[INFO] [stdout] 491 +     fn next(&mut self) -> Option<&'a K> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rbtree v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:535:34
[INFO] [stdout]     |
[INFO] [stdout] 535 |     fn next(&mut self) -> Option<(&'a V)> {
[INFO] [stdout]     |                                  ^     ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 535 -     fn next(&mut self) -> Option<(&'a V)> {
[INFO] [stdout] 535 +     fn next(&mut self) -> Option<&'a V> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:581:34
[INFO] [stdout]     |
[INFO] [stdout] 581 |     fn next(&mut self) -> Option<(&'a mut V)> {
[INFO] [stdout]     |                                  ^         ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 581 -     fn next(&mut self) -> Option<(&'a mut V)> {
[INFO] [stdout] 581 +     fn next(&mut self) -> Option<&'a mut V> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::RBTree`
[INFO] [stdout]     --> src/lib.rs:1404:9
[INFO] [stdout]      |
[INFO] [stdout] 1404 |     use super::RBTree;
[INFO] [stdout]      |         ^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:491:34
[INFO] [stdout]     |
[INFO] [stdout] 491 |     fn next(&mut self) -> Option<(&'a K)> {
[INFO] [stdout]     |                                  ^     ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 491 -     fn next(&mut self) -> Option<(&'a K)> {
[INFO] [stdout] 491 +     fn next(&mut self) -> Option<&'a K> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:535:34
[INFO] [stdout]     |
[INFO] [stdout] 535 |     fn next(&mut self) -> Option<(&'a V)> {
[INFO] [stdout]     |                                  ^     ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 535 -     fn next(&mut self) -> Option<(&'a V)> {
[INFO] [stdout] 535 +     fn next(&mut self) -> Option<&'a V> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:581:34
[INFO] [stdout]     |
[INFO] [stdout] 581 |     fn next(&mut self) -> Option<(&'a mut V)> {
[INFO] [stdout]     |                                  ^         ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 581 -     fn next(&mut self) -> Option<(&'a mut V)> {
[INFO] [stdout] 581 +     fn next(&mut self) -> Option<&'a mut V> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.34s
[INFO] running `Command { std: "docker" "inspect" "d249960334aac7ad4ba17a0b5d0f4ca45fdbff8606accf9c162ea019311bc1f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d249960334aac7ad4ba17a0b5d0f4ca45fdbff8606accf9c162ea019311bc1f5", kill_on_drop: false }`
[INFO] [stdout] d249960334aac7ad4ba17a0b5d0f4ca45fdbff8606accf9c162ea019311bc1f5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] cb5e72d412ba5798f3133b802a4fabbebc137289ee30b72b65ab9a2396b1de3a
[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" "cb5e72d412ba5798f3133b802a4fabbebc137289ee30b72b65ab9a2396b1de3a", kill_on_drop: false }`
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/lib.rs:491:34
[INFO] [stderr]     |
[INFO] [stderr] 491 |     fn next(&mut self) -> Option<(&'a K)> {
[INFO] [stderr]     |                                  ^     ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr] 491 -     fn next(&mut self) -> Option<(&'a K)> {
[INFO] [stderr] 491 +     fn next(&mut self) -> Option<&'a K> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/lib.rs:535:34
[INFO] [stderr]     |
[INFO] [stderr] 535 |     fn next(&mut self) -> Option<(&'a V)> {
[INFO] [stderr]     |                                  ^     ^
[INFO] [stderr]     |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr] 535 -     fn next(&mut self) -> Option<(&'a V)> {
[INFO] [stderr] 535 +     fn next(&mut self) -> Option<&'a V> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/lib.rs:581:34
[INFO] [stderr]     |
[INFO] [stderr] 581 |     fn next(&mut self) -> Option<(&'a mut V)> {
[INFO] [stderr]     |                                  ^         ^
[INFO] [stderr]     |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr] 581 -     fn next(&mut self) -> Option<(&'a mut V)> {
[INFO] [stderr] 581 +     fn next(&mut self) -> Option<&'a mut V> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::RBTree`
[INFO] [stderr]     --> src/lib.rs:1404:9
[INFO] [stderr]      |
[INFO] [stderr] 1404 |     use super::RBTree;
[INFO] [stderr]      |         ^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rbtree` (lib) generated 4 warnings
[INFO] [stderr] warning: `rbtree` (lib test) generated 3 warnings (3 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rbtree-002bb699ee88c1d5)
[INFO] [stdout] 
[INFO] [stdout] running 25 tests
[INFO] [stdout] test tests::test_clone ... ok
[INFO] [stdout] test tests::test_empty_iter ... ok
[INFO] [stdout] test tests::test_empty_remove ... ok
[INFO] [stdout] test tests::test_extend_iter ... ok
[INFO] [stdout] test tests::test_find ... ok
[INFO] [stdout] test tests::test_find_mut ... ok
[INFO] [stdout] test tests::test_from_iter ... ok
[INFO] [stdout] test tests::test_index ... ok
[INFO] [stdout] test tests::test_iter_len ... ok
[INFO] [stdout] test tests::test_insert ... ok
[INFO] [stdout] test tests::test_is_empty ... ok
[INFO] [stdout] test tests::test_eq ... ok
[INFO] [stdout] test tests::test_keys ... ok
[INFO] [stdout] test tests::test_show ... ok
[INFO] [stdout] test tests::test_values ... ok
[INFO] [stdout] test tests::test_values_mut ... ok
[INFO] [stdout] test tests::test_mut_size_hint ... ok
[INFO] [stdout] test tests::test_remove ... ok
[INFO] [stdout] test tests::test_size_hint ... ok
[INFO] [stdout] test tests::test_replace ... ok
[INFO] [stdout] test tests::test_pop ... ok
[INFO] [stdout] test tests::test_iterate ... ok
[INFO] [stdout] test tests::test_iter_mut_len ... ok
[INFO] [stdout] test tests::test_index_nonexistent - should panic ... ok
[INFO] [stdout] test tests::test_lots_of_insertions ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 25 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.19s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests rbtree
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> /opt/rustwide/workdir/src/lib.rs:491:34
[INFO] [stderr]     |
[INFO] [stderr] 491 |     fn next(&mut self) -> Option<(&'a K)> {
[INFO] [stderr]     |                                  ^     ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr] 491 -     fn next(&mut self) -> Option<(&'a K)> {
[INFO] [stderr] 491 +     fn next(&mut self) -> Option<&'a K> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> /opt/rustwide/workdir/src/lib.rs:535:34
[INFO] [stderr]     |
[INFO] [stderr] 535 |     fn next(&mut self) -> Option<(&'a V)> {
[INFO] [stderr]     |                                  ^     ^
[INFO] [stderr]     |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr] 535 -     fn next(&mut self) -> Option<(&'a V)> {
[INFO] [stderr] 535 +     fn next(&mut self) -> Option<&'a V> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> /opt/rustwide/workdir/src/lib.rs:581:34
[INFO] [stderr]     |
[INFO] [stderr] 581 |     fn next(&mut self) -> Option<(&'a mut V)> {
[INFO] [stderr]     |                                  ^         ^
[INFO] [stderr]     |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr] 581 -     fn next(&mut self) -> Option<(&'a mut V)> {
[INFO] [stderr] 581 +     fn next(&mut self) -> Option<&'a mut V> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stdout] running 8 tests
[INFO] [stdout] test src/lib.rs - RBTree (line 282) ... ok
[INFO] [stdout] test src/lib.rs - Iter (line 653) ... ok
[INFO] [stdout] test src/lib.rs - RBTree (line 323) ... ok
[INFO] [stdout] test src/lib.rs - IterMut (line 729) ... ok
[INFO] [stdout] test src/lib.rs - RBTree<K,V>::replace_or_insert (line 921) ... ok
[INFO] [stdout] test src/lib.rs - ValuesMut (line 547) ... ok
[INFO] [stdout] test src/lib.rs - Values (line 503) ... ok
[INFO] [stdout] test src/lib.rs - Keys (line 461) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 8 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.35s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "cb5e72d412ba5798f3133b802a4fabbebc137289ee30b72b65ab9a2396b1de3a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cb5e72d412ba5798f3133b802a4fabbebc137289ee30b72b65ab9a2396b1de3a", kill_on_drop: false }`
[INFO] [stdout] cb5e72d412ba5798f3133b802a4fabbebc137289ee30b72b65ab9a2396b1de3a