[INFO] fetching crate nstack 0.16.0...
[INFO] building nstack-0.16.0 against try#4987e9d4227139400384ab59296ffee3b0fb1183 for pr-146237-2
[INFO] extracting crate nstack 0.16.0 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate nstack 0.16.0
[INFO] finished tweaking crates.io crate nstack 0.16.0
[INFO] tweaked toml for crates.io crate nstack 0.16.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate nstack 0.16.0 on toolchain 4987e9d4227139400384ab59296ffee3b0fb1183
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "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" "+4987e9d4227139400384ab59296ffee3b0fb1183" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 2 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5f0efaeee8a071d8a35149b704e690e0a4cb37f514b95518094c7f01bdef586c
[INFO] running `Command { std: "docker" "start" "-a" "5f0efaeee8a071d8a35149b704e690e0a4cb37f514b95518094c7f01bdef586c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5f0efaeee8a071d8a35149b704e690e0a4cb37f514b95518094c7f01bdef586c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5f0efaeee8a071d8a35149b704e690e0a4cb37f514b95518094c7f01bdef586c", kill_on_drop: false }`
[INFO] [stdout] 5f0efaeee8a071d8a35149b704e690e0a4cb37f514b95518094c7f01bdef586c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 393e7b0cc5003712fe8d13ca2919db2d225abb260de1551425bf79b8e7106e4c
[INFO] running `Command { std: "docker" "start" "-a" "393e7b0cc5003712fe8d13ca2919db2d225abb260de1551425bf79b8e7106e4c", kill_on_drop: false }`
[INFO] [stderr]    Compiling ranno v0.1.0
[INFO] [stderr]    Compiling microkelvin v0.17.0
[INFO] [stderr]    Compiling nstack v0.16.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/lib.rs:53:14
[INFO] [stdout]    |
[INFO] [stdout] 53 |     fn child(&self, index: usize) -> Child<Self, A> {
[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] 53 |     fn child(&self, index: usize) -> Child<'_, Self, A> {
[INFO] [stdout]    |                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/annotation/index.rs:20:16
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn nth(&self, index: u64) -> Option<Branch<Self, A>> {
[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] 20 |     pub fn nth(&self, index: u64) -> Option<Branch<'_, Self, A>> {
[INFO] [stdout]    |                                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/annotation/keyed.rs:21:23
[INFO] [stdout]    |
[INFO] [stdout] 21 |     pub fn max_key<K>(&self) -> Option<Branch<Self, A>>
[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] 21 |     pub fn max_key<K>(&self) -> Option<Branch<'_, Self, A>>
[INFO] [stdout]    |                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/annotation/keyed.rs:31:27
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn max_key_mut<K>(&mut self) -> Option<BranchMut<Self, A>>
[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] 31 |     pub fn max_key_mut<K>(&mut self) -> Option<BranchMut<'_, Self, A>>
[INFO] [stdout]    |                                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/lib.rs:67:18
[INFO] [stdout]    |
[INFO] [stdout] 67 |     fn child_mut(&mut self, index: usize) -> ChildMut<Self, A> {
[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] 67 |     fn child_mut(&mut self, index: usize) -> ChildMut<'_, Self, A> {
[INFO] [stdout]    |                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/annotation/index.rs:25:20
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn nth_mut(&mut self, index: u64) -> Option<BranchMut<Self, A>> {
[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] 25 |     pub fn nth_mut(&mut self, index: u64) -> Option<BranchMut<'_, Self, A>> {
[INFO] [stdout]    |                                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.70s
[INFO] running `Command { std: "docker" "inspect" "393e7b0cc5003712fe8d13ca2919db2d225abb260de1551425bf79b8e7106e4c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "393e7b0cc5003712fe8d13ca2919db2d225abb260de1551425bf79b8e7106e4c", kill_on_drop: false }`
[INFO] [stdout] 393e7b0cc5003712fe8d13ca2919db2d225abb260de1551425bf79b8e7106e4c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e34bd69ecfa3f61620fb27587f13ec1d320b66f133fe9ddc6d0377adcf8a1d20
[INFO] running `Command { std: "docker" "start" "-a" "e34bd69ecfa3f61620fb27587f13ec1d320b66f133fe9ddc6d0377adcf8a1d20", kill_on_drop: false }`
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/lib.rs:53:14
[INFO] [stdout]    |
[INFO] [stdout] 53 |     fn child(&self, index: usize) -> Child<Self, A> {
[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] 53 |     fn child(&self, index: usize) -> Child<'_, Self, A> {
[INFO] [stdout]    |                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/annotation/index.rs:20:16
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn nth(&self, index: u64) -> Option<Branch<Self, A>> {
[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] 20 |     pub fn nth(&self, index: u64) -> Option<Branch<'_, Self, A>> {
[INFO] [stdout]    |                                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/annotation/keyed.rs:21:23
[INFO] [stdout]    |
[INFO] [stdout] 21 |     pub fn max_key<K>(&self) -> Option<Branch<Self, A>>
[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] 21 |     pub fn max_key<K>(&self) -> Option<Branch<'_, Self, A>>
[INFO] [stdout]    |                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/annotation/keyed.rs:31:27
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn max_key_mut<K>(&mut self) -> Option<BranchMut<Self, A>>
[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] 31 |     pub fn max_key_mut<K>(&mut self) -> Option<BranchMut<'_, Self, A>>
[INFO] [stdout]    |                                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/lib.rs:67:18
[INFO] [stdout]    |
[INFO] [stdout] 67 |     fn child_mut(&mut self, index: usize) -> ChildMut<Self, A> {
[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] 67 |     fn child_mut(&mut self, index: usize) -> ChildMut<'_, Self, A> {
[INFO] [stdout]    |                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/annotation/index.rs:25:20
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn nth_mut(&mut self, index: u64) -> Option<BranchMut<Self, A>> {
[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] 25 |     pub fn nth_mut(&mut self, index: u64) -> Option<BranchMut<'_, Self, A>> {
[INFO] [stdout]    |                                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling nstack v0.16.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/annotation/keyed.rs:21:23
[INFO] [stdout]    |
[INFO] [stdout] 21 |     pub fn max_key<K>(&self) -> Option<Branch<Self, A>>
[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] 21 |     pub fn max_key<K>(&self) -> Option<Branch<'_, Self, A>>
[INFO] [stdout]    |                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/annotation/keyed.rs:31:27
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn max_key_mut<K>(&mut self) -> Option<BranchMut<Self, A>>
[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] 31 |     pub fn max_key_mut<K>(&mut self) -> Option<BranchMut<'_, Self, A>>
[INFO] [stdout]    |                                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/annotation/index.rs:20:16
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn nth(&self, index: u64) -> Option<Branch<Self, A>> {
[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] 20 |     pub fn nth(&self, index: u64) -> Option<Branch<'_, Self, A>> {
[INFO] [stdout]    |                                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/annotation/index.rs:25:20
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn nth_mut(&mut self, index: u64) -> Option<BranchMut<Self, A>> {
[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] 25 |     pub fn nth_mut(&mut self, index: u64) -> Option<BranchMut<'_, Self, A>> {
[INFO] [stdout]    |                                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/lib.rs:53:14
[INFO] [stdout]    |
[INFO] [stdout] 53 |     fn child(&self, index: usize) -> Child<Self, A> {
[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] 53 |     fn child(&self, index: usize) -> Child<'_, Self, A> {
[INFO] [stdout]    |                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/lib.rs:67:18
[INFO] [stdout]    |
[INFO] [stdout] 67 |     fn child_mut(&mut self, index: usize) -> ChildMut<Self, A> {
[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] 67 |     fn child_mut(&mut self, index: usize) -> ChildMut<'_, Self, A> {
[INFO] [stdout]    |                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.78s
[INFO] running `Command { std: "docker" "inspect" "e34bd69ecfa3f61620fb27587f13ec1d320b66f133fe9ddc6d0377adcf8a1d20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e34bd69ecfa3f61620fb27587f13ec1d320b66f133fe9ddc6d0377adcf8a1d20", kill_on_drop: false }`
[INFO] [stdout] e34bd69ecfa3f61620fb27587f13ec1d320b66f133fe9ddc6d0377adcf8a1d20