[INFO] fetching crate btree_experiment 0.1.106...
[INFO] checking btree_experiment-0.1.106 against 1.95.0 for pr-155915
[INFO] extracting crate btree_experiment 0.1.106 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate btree_experiment 0.1.106
[INFO] finished tweaking crates.io crate btree_experiment 0.1.106
[INFO] tweaked toml for crates.io crate btree_experiment 0.1.106 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate btree_experiment 0.1.106 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "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" "+1.95.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 75 packages to latest compatible versions
[INFO] [stderr]       Adding bincode v1.3.3 (available: v3.0.0)
[INFO] [stderr]       Adding criterion v0.5.1 (available: v0.8.2)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded cap v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 58f3199e8501ad9c156173e5a386f0efea3426d55095d5d3cb9eeb3b898a66de
[INFO] running `Command { std: "docker" "start" "-a" "58f3199e8501ad9c156173e5a386f0efea3426d55095d5d3cb9eeb3b898a66de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "58f3199e8501ad9c156173e5a386f0efea3426d55095d5d3cb9eeb3b898a66de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "58f3199e8501ad9c156173e5a386f0efea3426d55095d5d3cb9eeb3b898a66de", kill_on_drop: false }`
[INFO] [stdout] 58f3199e8501ad9c156173e5a386f0efea3426d55095d5d3cb9eeb3b898a66de
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0487088789ec710cc10a5ba7488bcdb25147db464c6e99245d8080ff39943259
[INFO] running `Command { std: "docker" "start" "-a" "0487088789ec710cc10a5ba7488bcdb25147db464c6e99245d8080ff39943259", kill_on_drop: false }`
[INFO] [stderr]     Checking regex-syntax v0.8.10
[INFO] [stderr]    Compiling libmimalloc-sys v0.1.47
[INFO] [stderr]     Checking serde_json v1.0.149
[INFO] [stderr]     Checking cap v0.1.2
[INFO] [stderr]     Checking btree_experiment v0.1.106 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/vecs.rs:658:17
[INFO] [stdout]     |
[INFO] [stdout] 658 |     pub fn iter(&self) -> IterPairVec<K, V> {
[INFO] [stdout]     |                 ^^^^^     ^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the 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: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 658 |     pub fn iter(&self) -> IterPairVec<'_, K, V> {
[INFO] [stdout]     |                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/vecs.rs:666:18
[INFO] [stdout]     |
[INFO] [stdout] 666 |     pub fn range(&self, x: usize, y: usize) -> IterPairVec<K, V> {
[INFO] [stdout]     |                  ^^^^^                         ^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 666 |     pub fn range(&self, x: usize, y: usize) -> IterPairVec<'_, K, V> {
[INFO] [stdout]     |                                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/vecs.rs:675:21
[INFO] [stdout]     |
[INFO] [stdout] 675 |     pub fn iter_mut(&mut self) -> IterMutPairVec<K, V> {
[INFO] [stdout]     |                     ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 675 |     pub fn iter_mut(&mut self) -> IterMutPairVec<'_, K, V> {
[INFO] [stdout]     |                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/vecs.rs:684:22
[INFO] [stdout]     |
[INFO] [stdout] 684 |     pub fn range_mut(&mut self, x: usize, y: usize) -> IterMutPairVec<K, V> {
[INFO] [stdout]     |                      ^^^^^^^^^                         ^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 684 |     pub fn range_mut(&mut self, x: usize, y: usize) -> IterMutPairVec<'_, K, V> {
[INFO] [stdout]     |                                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking regex-automata v0.4.14
[INFO] [stderr]     Checking mimalloc v0.1.50
[INFO] [stderr]     Checking regex v1.12.3
[INFO] [stderr]     Checking criterion v0.5.1
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:19
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![cfg_attr(test, feature(btree_cursors, assert_matches))]
[INFO] [stdout]   |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `btree_experiment` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "0487088789ec710cc10a5ba7488bcdb25147db464c6e99245d8080ff39943259", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0487088789ec710cc10a5ba7488bcdb25147db464c6e99245d8080ff39943259", kill_on_drop: false }`
[INFO] [stdout] 0487088789ec710cc10a5ba7488bcdb25147db464c6e99245d8080ff39943259
