[INFO] fetching crate rbtree 0.1.5...
[INFO] testing rbtree-0.1.5 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate rbtree 0.1.5 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate rbtree 0.1.5 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", 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-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ae06c56d156c1d2fcbdbfeee8f3512f7c4076fb56bf3497c45250a86a8ff1e7b
[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" "ae06c56d156c1d2fcbdbfeee8f3512f7c4076fb56bf3497c45250a86a8ff1e7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ae06c56d156c1d2fcbdbfeee8f3512f7c4076fb56bf3497c45250a86a8ff1e7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ae06c56d156c1d2fcbdbfeee8f3512f7c4076fb56bf3497c45250a86a8ff1e7b", kill_on_drop: false }`
[INFO] [stdout] ae06c56d156c1d2fcbdbfeee8f3512f7c4076fb56bf3497c45250a86a8ff1e7b
[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=warn" "-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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b4aa33121b5b576f600e218942f064cd3a0814f2ca49897bf8bcb9f0a804b991
[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" "b4aa33121b5b576f600e218942f064cd3a0814f2ca49897bf8bcb9f0a804b991", 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]     |                                  ^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[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]     |                                  ^^^^^^^ help: remove these parentheses
[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]     |                                  ^^^^^^^^^^^ help: remove these parentheses
[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 0.50s
[INFO] running `Command { std: "docker" "inspect" "b4aa33121b5b576f600e218942f064cd3a0814f2ca49897bf8bcb9f0a804b991", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4aa33121b5b576f600e218942f064cd3a0814f2ca49897bf8bcb9f0a804b991", kill_on_drop: false }`
[INFO] [stdout] b4aa33121b5b576f600e218942f064cd3a0814f2ca49897bf8bcb9f0a804b991
[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=warn" "-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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c754ddb315ce29e4709f05d82d5f5d8aa87b8bc8550810b91e8823147b0c4210
[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" "c754ddb315ce29e4709f05d82d5f5d8aa87b8bc8550810b91e8823147b0c4210", 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]     |                                  ^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[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]     |                                  ^^^^^^^ help: remove these parentheses
[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:581:34
[INFO] [stdout]     |
[INFO] [stdout] 581 |     fn next(&mut self) -> Option<(&'a mut V)> {
[INFO] [stdout]     |                                  ^^^^^^^^^^^ help: remove these parentheses
[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]     |                                  ^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[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]     |                                  ^^^^^^^ help: remove these parentheses
[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]     |                                  ^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.10s
[INFO] running `Command { std: "docker" "inspect" "c754ddb315ce29e4709f05d82d5f5d8aa87b8bc8550810b91e8823147b0c4210", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c754ddb315ce29e4709f05d82d5f5d8aa87b8bc8550810b91e8823147b0c4210", kill_on_drop: false }`
[INFO] [stdout] c754ddb315ce29e4709f05d82d5f5d8aa87b8bc8550810b91e8823147b0c4210
[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=warn" "-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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen", 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] 8a7e0f13fe522d31c4d0f57da7f3a6dc6fe15dad15344549210136b887d715b3
[INFO] running `Command { std: "docker" "start" "-a" "8a7e0f13fe522d31c4d0f57da7f3a6dc6fe15dad15344549210136b887d715b3", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stdout] running 25 tests
[INFO] [stderr]    --> src/lib.rs:491:34
[INFO] [stdout] test tests::test_clone ... ok
[INFO] [stderr]     |
[INFO] [stdout] test tests::test_from_iter ... ok
[INFO] [stderr] 491 |     fn next(&mut self) -> Option<(&'a K)> {
[INFO] [stdout] test tests::test_index ... ok
[INFO] [stderr]     |                                  ^^^^^^^ help: remove these parentheses
[INFO] [stdout] test tests::test_find ... ok
[INFO] [stderr]     |
[INFO] [stdout] test tests::test_find_mut ... ok
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] test tests::test_pop ... ok
[INFO] [stderr] 
[INFO] [stdout] test tests::test_mut_size_hint ... ok
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stdout] test tests::test_remove ... ok
[INFO] [stderr]    --> src/lib.rs:535:34
[INFO] [stdout] test tests::test_replace ... ok
[INFO] [stderr]     |
[INFO] [stdout] test tests::test_show ... ok
[INFO] [stderr] 535 |     fn next(&mut self) -> Option<(&'a V)> {
[INFO] [stdout] test tests::test_size_hint ... ok
[INFO] [stderr]     |                                  ^^^^^^^ help: remove these parentheses
[INFO] [stdout] test tests::test_values ... ok
[INFO] [stderr] 
[INFO] [stdout] test tests::test_values_mut ... ok
[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]     |                                  ^^^^^^^^^^^ help: remove these parentheses
[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: 4 warnings emitted
[INFO] [stderr] 
[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]     |                                  ^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[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]     |                                  ^^^^^^^ help: remove these parentheses
[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]     |                                  ^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/rbtree-1484f9bcb93ec6dd
[INFO] [stdout] test tests::test_eq ... ok
[INFO] [stdout] test tests::test_empty_iter ... ok
[INFO] [stdout] test tests::test_insert ... ok
[INFO] [stdout] test tests::test_iterate ... ok
[INFO] [stdout] test tests::test_is_empty ... ok
[INFO] [stdout] test tests::test_keys ... ok
[INFO] [stdout] test tests::test_empty_remove ... ok
[INFO] [stdout] test tests::test_extend_iter ... ok
[INFO] [stdout] test tests::test_iter_len ... ok
[INFO] [stdout] test tests::test_iter_mut_len ... ok
[INFO] [stdout] test tests::test_index_nonexistent ... ok
[INFO] [stderr]    Doc-tests rbtree
[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 0.12s
[INFO] [stdout] 
[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]     |                                  ^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[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]     |                                  ^^^^^^^ help: remove these parentheses
[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]     |                                  ^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stdout] running 8 tests
[INFO] [stdout] test src/lib.rs - RBTree<K, V>::replace_or_insert (line 921) ... ok
[INFO] [stdout] test src/lib.rs - Values (line 503) ... ok
[INFO] [stdout] test src/lib.rs - Keys (line 461) ... ok
[INFO] [stdout] test src/lib.rs - RBTree (line 324) ... ok
[INFO] [stdout] test src/lib.rs - ValuesMut (line 547) ... ok
[INFO] [stdout] test src/lib.rs - IterMut (line 729) ... ok
[INFO] [stdout] test src/lib.rs - RBTree (line 282) ... ok
[INFO] [stdout] test src/lib.rs - Iter (line 653) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 8 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.31s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "8a7e0f13fe522d31c4d0f57da7f3a6dc6fe15dad15344549210136b887d715b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a7e0f13fe522d31c4d0f57da7f3a6dc6fe15dad15344549210136b887d715b3", kill_on_drop: false }`
[INFO] [stdout] 8a7e0f13fe522d31c4d0f57da7f3a6dc6fe15dad15344549210136b887d715b3