[INFO] fetching crate starling 2.4.2...
[INFO] extracting crate starling 2.4.2 into work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/reg/starling/2.4.2
[INFO] extracting crate starling 2.4.2 into work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/reg/starling/2.4.2
[INFO] validating manifest of starling-2.4.2 on toolchain master#c8865d8e195813ade6b84434ac9f8850e7112d1a
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of starling-2.4.2 on toolchain try#e212b7d492c96d3837691ba29d32d5f468933fb8
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing starling-2.4.2
[INFO] finished frobbing starling-2.4.2
[INFO] frobbed toml for starling-2.4.2 written to work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/reg/starling/2.4.2/Cargo.toml
[INFO] started frobbing starling-2.4.2
[INFO] finished frobbing starling-2.4.2
[INFO] frobbed toml for starling-2.4.2 written to work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/reg/starling/2.4.2/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde-pickle v0.5.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] testing starling-2.4.2 against try#e212b7d492c96d3837691ba29d32d5f468933fb8 for pr-61629
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-3/try#e212b7d492c96d3837691ba29d32d5f468933fb8:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/reg/starling/2.4.2:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "build" "--frozen"`
[INFO] [stdout] 4c3ee739a15fbb078fe59fbb2cdccb432fd79a980668e52e3b0ddb933e95894f
[INFO] running `"docker" "start" "-a" "4c3ee739a15fbb078fe59fbb2cdccb432fd79a980668e52e3b0ddb933e95894f"`
[INFO] [stderr]    Compiling starling v2.4.2 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/merkle_bit.rs:85:13
[INFO] [stderr]    |
[INFO] [stderr] 85 |         let mut new_ref;
[INFO] [stderr]    |             ----^^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/merkle_bit.rs:960:17
[INFO] [stderr]     |
[INFO] [stderr] 960 |             let mut node;
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.94s
[INFO] running `"docker" "inspect" "4c3ee739a15fbb078fe59fbb2cdccb432fd79a980668e52e3b0ddb933e95894f"`
[INFO] running `"docker" "rm" "-f" "4c3ee739a15fbb078fe59fbb2cdccb432fd79a980668e52e3b0ddb933e95894f"`
[INFO] [stdout] 4c3ee739a15fbb078fe59fbb2cdccb432fd79a980668e52e3b0ddb933e95894f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-3/try#e212b7d492c96d3837691ba29d32d5f468933fb8:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/reg/starling/2.4.2:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "test" "--frozen" "--no-run"`
[INFO] [stdout] 57c6f61978de52dad062a8cec5c2fa78eac77c8d7460005b32c86d16fe79db38
[INFO] running `"docker" "start" "-a" "57c6f61978de52dad062a8cec5c2fa78eac77c8d7460005b32c86d16fe79db38"`
[INFO] [stderr]    Compiling starling v2.4.2 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/merkle_bit.rs:85:13
[INFO] [stderr]    |
[INFO] [stderr] 85 |         let mut new_ref;
[INFO] [stderr]    |             ----^^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/merkle_bit.rs:960:17
[INFO] [stderr]     |
[INFO] [stderr] 960 |             let mut node;
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.62s
[INFO] running `"docker" "inspect" "57c6f61978de52dad062a8cec5c2fa78eac77c8d7460005b32c86d16fe79db38"`
[INFO] running `"docker" "rm" "-f" "57c6f61978de52dad062a8cec5c2fa78eac77c8d7460005b32c86d16fe79db38"`
[INFO] [stdout] 57c6f61978de52dad062a8cec5c2fa78eac77c8d7460005b32c86d16fe79db38
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-3/try#e212b7d492c96d3837691ba29d32d5f468933fb8:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/reg/starling/2.4.2:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "test" "--frozen"`
[INFO] [stdout] 3a527812a785dc755e99bd3a5ef11d4becfed1f18138f834d9e7c0384d2eb7a5
[INFO] running `"docker" "start" "-a" "3a527812a785dc755e99bd3a5ef11d4becfed1f18138f834d9e7c0384d2eb7a5"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.22s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/starling-21114fb6bd5c81c8
[INFO] [stdout] 
[INFO] [stdout] running 8 tests
[INFO] [stdout] test merkle_bit::tests::it_chooses_the_right_branch_easy ... ok
[INFO] [stdout] test merkle_bit::tests::it_splits_an_odd_length_sorted_list_of_pairs_with_more_ones ... ok
[INFO] [stdout] test merkle_bit::tests::it_splits_an_odd_length_sorted_list_of_pairs_with_more_zeros ... ok
[INFO] [stdout] test merkle_bit::tests::it_splits_an_even_length_sorted_list_of_pairs ... ok
[INFO] [stdout] test merkle_bit::tests::it_splits_an_all_zeros_sorted_list_of_pairs ... ok
[INFO] [stdout] test merkle_bit::tests::it_splits_an_all_ones_sorted_list_of_pairs ... ok
[INFO] [stdout] test merkle_bit::tests::it_chooses_the_right_branch_medium ... ok
[INFO] [stdout] test merkle_bit::tests::it_chooses_the_right_branch_hard ... ok
[INFO] [stderr]      Running /opt/crater/target/debug/deps/merkle_bit-f72b952aef10a6ba
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 8 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 37 tests
[INFO] [stdout] test integration_tests::it_gets_an_item_out_of_a_simple_tree ... ok
[INFO] [stdout] test integration_tests::it_fails_to_get_from_empty_tree ... ok
[INFO] [stdout] test integration_tests::it_gets_items_from_a_complex_tree ... ok
[INFO] [stdout] test integration_tests::it_fails_to_get_a_nonexistent_item ... ok
[INFO] [stdout] test integration_tests::it_does_not_panic_when_removing_a_nonexistent_node ... ok
[INFO] [stdout] test integration_tests::it_gets_items_from_a_small_balanced_tree ... ok
[INFO] [stdout] test integration_tests::it_correctly_increments_a_leaf_reference_count ... ok
[INFO] [stdout] test integration_tests::it_gets_items_from_a_small_unbalanced_tree ... ok
[INFO] [stdout] test integration_tests::it_inserts_a_leaf_node_into_a_tree_with_one_item ... ok
[INFO] [stdout] test integration_tests::it_inserts_a_leaf_node_into_empty_tree ... ok
[INFO] [stdout] test integration_tests::it_gets_items_from_a_medium_balanced_tree ... ok
[INFO] [stdout] test integration_tests::it_gets_items_from_a_medium_unbalanced_tree ... ok
[INFO] [stdout] test integration_tests::it_inserts_a_small_even_amount_of_nodes_into_empty_tree ... ok
[INFO] [stdout] test integration_tests::it_inserts_a_small_odd_amount_of_nodes_into_empty_tree ... ok
[INFO] [stdout] test integration_tests::it_inserts_multiple_leaf_nodes_into_a_small_tree_with_existing_items ... ok
[INFO] [stdout] test integration_tests::it_inserts_a_medium_odd_amount_of_nodes_into_empty_tree ... ok
[INFO] [stdout] test integration_tests::it_inserts_a_medium_even_amount_of_nodes_into_empty_tree ... ok
[INFO] [stdout] test integration_tests::it_inserts_multiple_leaf_nodes_into_empty_tree ... ok
[INFO] [stdout] test integration_tests::it_inserts_two_leaf_nodes_into_empty_tree_with_first_bit_split ... ok
[INFO] [stdout] test integration_tests::it_inserts_two_leaf_nodes_into_empty_tree ... ok
[INFO] [stdout] test integration_tests::it_inserts_with_compressed_nodes_that_are_not_descendants ... ok
[INFO] [stdout] test integration_tests::it_inserts_with_compressed_nodes_that_are_descendants ... ok
[INFO] [stdout] test integration_tests::it_removes_a_node ... ok
[INFO] [stdout] test integration_tests::it_removes_a_small_old_tree ... ok
[INFO] [stdout] test integration_tests::it_removes_an_entire_tree ... ok
[INFO] [stdout] test integration_tests::it_removes_an_old_large_root ... ok
[INFO] [stdout] test integration_tests::it_removes_an_old_root ... ok
[INFO] [stdout] test integration_tests::it_inserts_a_large_odd_amount_of_nodes_into_empty_tree ... ok
[INFO] [stdout] test integration_tests::it_returns_the_same_number_of_values_as_keys ... ok
[INFO] [stdout] test integration_tests::it_updates_an_existing_entry ... ok
[INFO] [stdout] test integration_tests::it_inserts_a_large_even_amount_of_nodes_into_empty_tree ... ok
[INFO] [stdout] test integration_tests::it_gets_items_from_a_large_balanced_tree ... ok
[INFO] [stdout] test integration_tests::it_gets_items_from_a_large_unbalanced_tree ... ok
[INFO] [stdout] test integration_tests::it_inserts_multiple_leaf_nodes_into_a_tree_with_existing_items ... ok
[INFO] [stdout] test integration_tests::it_updates_multiple_existing_entries ... ok
[INFO] [stdout] test integration_tests::it_iterates_over_multiple_inserts_correctly ... ok
[INFO] [stdout] test integration_tests::it_correctly_iterates_removals ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 37 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests starling
[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
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "3a527812a785dc755e99bd3a5ef11d4becfed1f18138f834d9e7c0384d2eb7a5"`
[INFO] running `"docker" "rm" "-f" "3a527812a785dc755e99bd3a5ef11d4becfed1f18138f834d9e7c0384d2eb7a5"`
[INFO] [stdout] 3a527812a785dc755e99bd3a5ef11d4becfed1f18138f834d9e7c0384d2eb7a5