[INFO] fetching crate marching-buffer 0.1.0...
[INFO] testing marching-buffer-0.1.0 against try#0abe69e6c16114311cc2700e972492e64d69c28f for pr-154065-1
[INFO] extracting crate marching-buffer 0.1.0 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate marching-buffer 0.1.0
[INFO] finished tweaking crates.io crate marching-buffer 0.1.0
[INFO] tweaked toml for crates.io crate marching-buffer 0.1.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate marching-buffer 0.1.0 on toolchain 0abe69e6c16114311cc2700e972492e64d69c28f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "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" "+0abe69e6c16114311cc2700e972492e64d69c28f" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d982801fca3481a1a3b1938a6486d2ac3d944332d92fd12a04e3a8cd7c16ef8a
[INFO] running `Command { std: "docker" "start" "-a" "d982801fca3481a1a3b1938a6486d2ac3d944332d92fd12a04e3a8cd7c16ef8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d982801fca3481a1a3b1938a6486d2ac3d944332d92fd12a04e3a8cd7c16ef8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d982801fca3481a1a3b1938a6486d2ac3d944332d92fd12a04e3a8cd7c16ef8a", kill_on_drop: false }`
[INFO] [stdout] d982801fca3481a1a3b1938a6486d2ac3d944332d92fd12a04e3a8cd7c16ef8a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 80038783193af4de877b0504ab9b68216fd32edd7baa81c48ced4689f1691a94
[INFO] running `Command { std: "docker" "start" "-a" "80038783193af4de877b0504ab9b68216fd32edd7baa81c48ced4689f1691a94", kill_on_drop: false }`
[INFO] [stderr]    Compiling marching-buffer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:111:19
[INFO] [stdout]     |
[INFO] [stdout] 111 |     pub fn access(&self) -> ReaderAccess<T> {
[INFO] [stdout]     |                   ^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout]     |                   |         |
[INFO] [stdout]     |                   |         the same lifetime is hidden here
[INFO] [stdout]     |                   |         the same lifetime is hidden here
[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] 111 |     pub fn access(&self) -> ReaderAccess<'_, T> {
[INFO] [stdout]     |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:115:23
[INFO] [stdout]     |
[INFO] [stdout] 115 |     pub fn try_access(&self) -> Option<ReaderAccess<T>> {
[INFO] [stdout]     |                       ^^^^^            ^^^^^^^^^^^^^^^
[INFO] [stdout]     |                       |                |
[INFO] [stdout]     |                       |                the same lifetime is hidden here
[INFO] [stdout]     |                       |                the same lifetime is hidden here
[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] 115 |     pub fn try_access(&self) -> Option<ReaderAccess<'_, T>> {
[INFO] [stdout]     |                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:229:19
[INFO] [stdout]     |
[INFO] [stdout] 229 |     pub fn access(&mut self) -> WriterAccess<T> {
[INFO] [stdout]     |                   ^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout]     |                   |             |
[INFO] [stdout]     |                   |             the same lifetime is hidden here
[INFO] [stdout]     |                   |             the same lifetime is hidden here
[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] 229 |     pub fn access(&mut self) -> WriterAccess<'_, T> {
[INFO] [stdout]     |                                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:233:23
[INFO] [stdout]     |
[INFO] [stdout] 233 |     pub fn try_access(&mut self) -> Option<WriterAccess<T>> {
[INFO] [stdout]     |                       ^^^^^^^^^            ^^^^^^^^^^^^^^^
[INFO] [stdout]     |                       |                    |
[INFO] [stdout]     |                       |                    the same lifetime is hidden here
[INFO] [stdout]     |                       |                    the same lifetime is hidden here
[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] 233 |     pub fn try_access(&mut self) -> Option<WriterAccess<'_, T>> {
[INFO] [stdout]     |                                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/lib.rs:255:13
[INFO] [stdout]     |
[INFO] [stdout] 255 | ...   &mut copy_buffer[..copied_this_round].copy_from_slice(&reader.access().as_slice()[bytes_copied .. (bytes_copied + copied_this_round)]);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 255 |             let _ = &mut copy_buffer[..copied_this_round].copy_from_slice(&reader.access().as_slice()[bytes_copied .. (bytes_copied + copied_this_round)]);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.18s
[INFO] running `Command { std: "docker" "inspect" "80038783193af4de877b0504ab9b68216fd32edd7baa81c48ced4689f1691a94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "80038783193af4de877b0504ab9b68216fd32edd7baa81c48ced4689f1691a94", kill_on_drop: false }`
[INFO] [stdout] 80038783193af4de877b0504ab9b68216fd32edd7baa81c48ced4689f1691a94
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6c578893f3f4ee80932cbb132b932f8ee4c3a1085cf0d77aab9403d84a754d18
[INFO] running `Command { std: "docker" "start" "-a" "6c578893f3f4ee80932cbb132b932f8ee4c3a1085cf0d77aab9403d84a754d18", kill_on_drop: false }`
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:111:19
[INFO] [stdout]     |
[INFO] [stdout] 111 |     pub fn access(&self) -> ReaderAccess<T> {
[INFO] [stdout]     |                   ^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout]     |                   |         |
[INFO] [stdout]     |                   |         the same lifetime is hidden here
[INFO] [stdout]     |                   |         the same lifetime is hidden here
[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] 111 |     pub fn access(&self) -> ReaderAccess<'_, T> {
[INFO] [stdout]     |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:115:23
[INFO] [stdout]     |
[INFO] [stdout] 115 |     pub fn try_access(&self) -> Option<ReaderAccess<T>> {
[INFO] [stdout]     |                       ^^^^^            ^^^^^^^^^^^^^^^
[INFO] [stdout]     |                       |                |
[INFO] [stdout]     |                       |                the same lifetime is hidden here
[INFO] [stdout]     |                       |                the same lifetime is hidden here
[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] 115 |     pub fn try_access(&self) -> Option<ReaderAccess<'_, T>> {
[INFO] [stdout]     |                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:229:19
[INFO] [stdout]     |
[INFO] [stdout] 229 |     pub fn access(&mut self) -> WriterAccess<T> {
[INFO] [stdout]     |                   ^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout]     |                   |             |
[INFO] [stdout]     |                   |             the same lifetime is hidden here
[INFO] [stdout]     |                   |             the same lifetime is hidden here
[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] 229 |     pub fn access(&mut self) -> WriterAccess<'_, T> {
[INFO] [stdout]     |                                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:233:23
[INFO] [stdout]     |
[INFO] [stdout] 233 |     pub fn try_access(&mut self) -> Option<WriterAccess<T>> {
[INFO] [stdout]     |                       ^^^^^^^^^            ^^^^^^^^^^^^^^^
[INFO] [stdout]     |                       |                    |
[INFO] [stdout]     |                       |                    the same lifetime is hidden here
[INFO] [stdout]     |                       |                    the same lifetime is hidden here
[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] 233 |     pub fn try_access(&mut self) -> Option<WriterAccess<'_, T>> {
[INFO] [stdout]     |                                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling marching-buffer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/lib.rs:255:13
[INFO] [stdout]     |
[INFO] [stdout] 255 | ...   &mut copy_buffer[..copied_this_round].copy_from_slice(&reader.access().as_slice()[bytes_copied .. (bytes_copied + copied_this_round)]);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 255 |             let _ = &mut copy_buffer[..copied_this_round].copy_from_slice(&reader.access().as_slice()[bytes_copied .. (bytes_copied + copied_this_round)]);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:111:19
[INFO] [stdout]     |
[INFO] [stdout] 111 |     pub fn access(&self) -> ReaderAccess<T> {
[INFO] [stdout]     |                   ^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout]     |                   |         |
[INFO] [stdout]     |                   |         the same lifetime is hidden here
[INFO] [stdout]     |                   |         the same lifetime is hidden here
[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] 111 |     pub fn access(&self) -> ReaderAccess<'_, T> {
[INFO] [stdout]     |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:115:23
[INFO] [stdout]     |
[INFO] [stdout] 115 |     pub fn try_access(&self) -> Option<ReaderAccess<T>> {
[INFO] [stdout]     |                       ^^^^^            ^^^^^^^^^^^^^^^
[INFO] [stdout]     |                       |                |
[INFO] [stdout]     |                       |                the same lifetime is hidden here
[INFO] [stdout]     |                       |                the same lifetime is hidden here
[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] 115 |     pub fn try_access(&self) -> Option<ReaderAccess<'_, T>> {
[INFO] [stdout]     |                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:229:19
[INFO] [stdout]     |
[INFO] [stdout] 229 |     pub fn access(&mut self) -> WriterAccess<T> {
[INFO] [stdout]     |                   ^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout]     |                   |             |
[INFO] [stdout]     |                   |             the same lifetime is hidden here
[INFO] [stdout]     |                   |             the same lifetime is hidden here
[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] 229 |     pub fn access(&mut self) -> WriterAccess<'_, T> {
[INFO] [stdout]     |                                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:233:23
[INFO] [stdout]     |
[INFO] [stdout] 233 |     pub fn try_access(&mut self) -> Option<WriterAccess<T>> {
[INFO] [stdout]     |                       ^^^^^^^^^            ^^^^^^^^^^^^^^^
[INFO] [stdout]     |                       |                    |
[INFO] [stdout]     |                       |                    the same lifetime is hidden here
[INFO] [stdout]     |                       |                    the same lifetime is hidden here
[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] 233 |     pub fn try_access(&mut self) -> Option<WriterAccess<'_, T>> {
[INFO] [stdout]     |                                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/lib.rs:255:13
[INFO] [stdout]     |
[INFO] [stdout] 255 | ...   &mut copy_buffer[..copied_this_round].copy_from_slice(&reader.access().as_slice()[bytes_copied .. (bytes_copied + copied_this_round)]);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 255 |             let _ = &mut copy_buffer[..copied_this_round].copy_from_slice(&reader.access().as_slice()[bytes_copied .. (bytes_copied + copied_this_round)]);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.47s
[INFO] running `Command { std: "docker" "inspect" "6c578893f3f4ee80932cbb132b932f8ee4c3a1085cf0d77aab9403d84a754d18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6c578893f3f4ee80932cbb132b932f8ee4c3a1085cf0d77aab9403d84a754d18", kill_on_drop: false }`
[INFO] [stdout] 6c578893f3f4ee80932cbb132b932f8ee4c3a1085cf0d77aab9403d84a754d18
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 940ce50ae4bbd0d825095cccb45dd66fb442b4088a1ebbc5f855c2960f7b5516
[INFO] running `Command { std: "docker" "start" "-a" "940ce50ae4bbd0d825095cccb45dd66fb442b4088a1ebbc5f855c2960f7b5516", kill_on_drop: false }`
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/lib.rs:111:19
[INFO] [stderr]     |
[INFO] [stderr] 111 |     pub fn access(&self) -> ReaderAccess<T> {
[INFO] [stderr]     |                   ^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stderr]     |                   |         |
[INFO] [stderr]     |                   |         the same lifetime is hidden here
[INFO] [stderr]     |                   |         the same lifetime is hidden here
[INFO] [stderr]     |                   the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 111 |     pub fn access(&self) -> ReaderAccess<'_, T> {
[INFO] [stderr]     |                                          +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/lib.rs:115:23
[INFO] [stderr]     |
[INFO] [stderr] 115 |     pub fn try_access(&self) -> Option<ReaderAccess<T>> {
[INFO] [stderr]     |                       ^^^^^            ^^^^^^^^^^^^^^^
[INFO] [stderr]     |                       |                |
[INFO] [stderr]     |                       |                the same lifetime is hidden here
[INFO] [stderr]     |                       |                the same lifetime is hidden here
[INFO] [stderr]     |                       the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 115 |     pub fn try_access(&self) -> Option<ReaderAccess<'_, T>> {
[INFO] [stderr]     |                                                     +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/lib.rs:229:19
[INFO] [stderr]     |
[INFO] [stderr] 229 |     pub fn access(&mut self) -> WriterAccess<T> {
[INFO] [stderr]     |                   ^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stderr]     |                   |             |
[INFO] [stderr]     |                   |             the same lifetime is hidden here
[INFO] [stderr]     |                   |             the same lifetime is hidden here
[INFO] [stderr]     |                   the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 229 |     pub fn access(&mut self) -> WriterAccess<'_, T> {
[INFO] [stderr]     |                                              +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/lib.rs:233:23
[INFO] [stderr]     |
[INFO] [stderr] 233 |     pub fn try_access(&mut self) -> Option<WriterAccess<T>> {
[INFO] [stderr]     |                       ^^^^^^^^^            ^^^^^^^^^^^^^^^
[INFO] [stderr]     |                       |                    |
[INFO] [stderr]     |                       |                    the same lifetime is hidden here
[INFO] [stderr]     |                       |                    the same lifetime is hidden here
[INFO] [stderr]     |                       the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 233 |     pub fn try_access(&mut self) -> Option<WriterAccess<'_, T>> {
[INFO] [stderr]     |                                                         +++
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]    --> src/lib.rs:255:13
[INFO] [stderr]     |
[INFO] [stderr] 255 | ...   &mut copy_buffer[..copied_this_round].copy_from_slice(&reader.access().as_slice()[bytes_copied .. (bytes_copied + copied_this_round)]);
[INFO] [stderr]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 255 |             let _ = &mut copy_buffer[..copied_this_round].copy_from_slice(&reader.access().as_slice()[bytes_copied .. (bytes_copied + copied_this_round)]);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `marching-buffer` (lib) generated 5 warnings (run `cargo fix --lib -p marching-buffer` to apply 4 suggestions)
[INFO] [stderr] warning: `marching-buffer` (lib test) generated 5 warnings (5 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/marching_buffer-cc0c190a896664d0)
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test tests::basic_nesting_test ... ok
[INFO] [stdout] test tests::unfinished_writes_are_ignored ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests marching_buffer
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "940ce50ae4bbd0d825095cccb45dd66fb442b4088a1ebbc5f855c2960f7b5516", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "940ce50ae4bbd0d825095cccb45dd66fb442b4088a1ebbc5f855c2960f7b5516", kill_on_drop: false }`
[INFO] [stdout] 940ce50ae4bbd0d825095cccb45dd66fb442b4088a1ebbc5f855c2960f7b5516
