[INFO] updating cached repository https://github.com/raiker/persistent-rope
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7f638488c32998e1683a0a3ba8de4846c9a5dee7
[INFO] testing raiker/persistent-rope against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fraiker%2Fpersistent-rope" "work/builds/worker-3/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/raiker/persistent-rope on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/raiker/persistent-rope
[INFO] finished tweaking git repo https://github.com/raiker/persistent-rope
[INFO] tweaked toml for git repo https://github.com/raiker/persistent-rope written to work/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/raiker/persistent-rope already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 48af8595e7247685b3723cd0f006a54c96ded8dcfba3ba4bdd652a6204b1c9db
[INFO] running `"docker" "start" "-a" "48af8595e7247685b3723cd0f006a54c96ded8dcfba3ba4bdd652a6204b1c9db"`
[INFO] [stderr]    Compiling persistent-rope v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `parent`
[INFO] [stderr]    --> src/main.rs:141:69
[INFO] [stderr]     |
[INFO] [stderr] 141 |     fn rec_insert(key: K, val: V, current: &Rc<Option<TreeNode<K,V>>>, parent: Option<&Rc<Option<TreeNode<K,V>>>>) -> InsertionResultRecursion<K,V>{
[INFO] [stderr]     |                                                                        ^^^^^^ help: consider prefixing with an underscore: `_parent`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `RcSliceableString`
[INFO] [stderr]  --> src/rcstr.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub struct RcSliceableString {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/rcstr.rs:10:2
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub fn new(s: String) -> RcSliceableString {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `slice`
[INFO] [stderr]   --> src/rcstr.rs:19:2
[INFO] [stderr]    |
[INFO] [stderr] 19 |     pub fn slice(&self, start: usize, len: usize) -> RcSliceableString {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `as_str`
[INFO] [stderr]   --> src/rcstr.rs:34:2
[INFO] [stderr]    |
[INFO] [stderr] 34 |     pub fn as_str(&self) -> &str {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.28s
[INFO] running `"docker" "inspect" "48af8595e7247685b3723cd0f006a54c96ded8dcfba3ba4bdd652a6204b1c9db"`
[INFO] running `"docker" "rm" "-f" "48af8595e7247685b3723cd0f006a54c96ded8dcfba3ba4bdd652a6204b1c9db"`
[INFO] [stdout] 48af8595e7247685b3723cd0f006a54c96ded8dcfba3ba4bdd652a6204b1c9db
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] b14531bf44d2b5eef7ff90b71693a041a9d9eec59164763e02b2f32a7321323c
[INFO] running `"docker" "start" "-a" "b14531bf44d2b5eef7ff90b71693a041a9d9eec59164763e02b2f32a7321323c"`
[INFO] [stderr]    Compiling persistent-rope v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `parent`
[INFO] [stderr]    --> src/main.rs:141:69
[INFO] [stderr]     |
[INFO] [stderr] 141 |     fn rec_insert(key: K, val: V, current: &Rc<Option<TreeNode<K,V>>>, parent: Option<&Rc<Option<TreeNode<K,V>>>>) -> InsertionResultRecursion<K,V>{
[INFO] [stderr]     |                                                                        ^^^^^^ help: consider prefixing with an underscore: `_parent`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.30s
[INFO] running `"docker" "inspect" "b14531bf44d2b5eef7ff90b71693a041a9d9eec59164763e02b2f32a7321323c"`
[INFO] running `"docker" "rm" "-f" "b14531bf44d2b5eef7ff90b71693a041a9d9eec59164763e02b2f32a7321323c"`
[INFO] [stdout] b14531bf44d2b5eef7ff90b71693a041a9d9eec59164763e02b2f32a7321323c
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "test" "--frozen"`
[INFO] [stdout] b774fdfc20f2741ed5f3f1fa256f64d52b32d3ffa26dc09c430ff8b6c6dc744f
[INFO] running `"docker" "start" "-a" "b774fdfc20f2741ed5f3f1fa256f64d52b32d3ffa26dc09c430ff8b6c6dc744f"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.00s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/persistent_rope-ffd7f08e28fdb758
[INFO] [stdout] 
[INFO] [stdout] running 13 tests
[INFO] [stdout] test rcstr::test::test_rc_sliceable_string ... ok
[INFO] [stdout] test tests::test_find ... ok
[INFO] [stdout] test tests::test_insert_case1 ... ok
[INFO] [stdout] test tests::test_insert_case2_left ... ok
[INFO] [stdout] test tests::test_insert_case2_right ... ok
[INFO] [stdout] test tests::test_insert_case3_right_a ... ok
[INFO] [stdout] test tests::test_insert_case3_left_a ... ok
[INFO] [stdout] test tests::test_insert_case3_left_b ... ok
[INFO] [stdout] test tests::test_insert_case5_left ... ok
[INFO] [stdout] test tests::test_insert_case4_right ... ok
[INFO] [stdout] test tests::test_insert_case4_left ... ok
[INFO] [stdout] test tests::test_insert_case3_right_b ... ok
[INFO] [stdout] test tests::test_insert_case5_right ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 13 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "b774fdfc20f2741ed5f3f1fa256f64d52b32d3ffa26dc09c430ff8b6c6dc744f"`
[INFO] running `"docker" "rm" "-f" "b774fdfc20f2741ed5f3f1fa256f64d52b32d3ffa26dc09c430ff8b6c6dc744f"`
[INFO] [stdout] b774fdfc20f2741ed5f3f1fa256f64d52b32d3ffa26dc09c430ff8b6c6dc744f