[INFO] fetching crate checked_array 0.1.5...
[INFO] checking checked_array-0.1.5 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate checked_array 0.1.5 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate checked_array 0.1.5
[INFO] finished tweaking crates.io crate checked_array 0.1.5
[INFO] tweaked toml for crates.io crate checked_array 0.1.5 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate checked_array 0.1.5 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9eba643b5be56cecdbb9c2fa4b4362b0c5d1057953f74c988038dc33896ac487
[INFO] running `Command { std: "docker" "start" "-a" "9eba643b5be56cecdbb9c2fa4b4362b0c5d1057953f74c988038dc33896ac487", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9eba643b5be56cecdbb9c2fa4b4362b0c5d1057953f74c988038dc33896ac487", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9eba643b5be56cecdbb9c2fa4b4362b0c5d1057953f74c988038dc33896ac487", kill_on_drop: false }`
[INFO] [stdout] 9eba643b5be56cecdbb9c2fa4b4362b0c5d1057953f74c988038dc33896ac487
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5fced229e49cb02657e9867e4854afac45feec71ffac32dab8a33e9955e4edca
[INFO] running `Command { std: "docker" "start" "-a" "5fced229e49cb02657e9867e4854afac45feec71ffac32dab8a33e9955e4edca", kill_on_drop: false }`
[INFO] [stderr]     Checking checked_array v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unexpected `cfg` condition value: `no_std`
[INFO] [stdout]  --> src/lib.rs:1:13
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature = "no_std", no_std)]
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: expected values for `feature` are: `default` and `std`
[INFO] [stdout]   = help: consider adding `no_std` as a feature in `Cargo.toml`
[INFO] [stdout]   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]   = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `no_std`
[INFO] [stdout]  --> src/lib.rs:1:13
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature = "no_std", no_std)]
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: expected values for `feature` are: `default` and `std`
[INFO] [stdout]   = help: consider adding `no_std` as a feature in `Cargo.toml`
[INFO] [stdout]   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]   = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/traits.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |     fn iter(&self) -> SliceIter<T>;
[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] 32 |     fn iter(&self) -> SliceIter<'_, T>;
[INFO] [stdout]    |                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/traits.rs:55:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |     fn iter_mut(&mut self) -> SliceIterMut<T>;
[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] 55 |     fn iter_mut(&mut self) -> SliceIterMut<'_, T>;
[INFO] [stdout]    |                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<T>, WillPanic>
[INFO] [stdout]    --> src/traits.rs:204:49
[INFO] [stdout]     |
[INFO] [stdout] 204 |       fn alloc_new() -> Result<Self, Self::Error> {
[INFO] [stdout]     |  _________________________________________________^
[INFO] [stdout] 205 | |         Ok(Self::new())
[INFO] [stdout] 206 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<T>, WillPanic>
[INFO] [stdout]    --> src/traits.rs:205:9
[INFO] [stdout]     |
[INFO] [stdout] 205 |         Ok(Self::new())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<T>, WillPanic>
[INFO] [stdout]    --> src/traits.rs:211:57
[INFO] [stdout]     |
[INFO] [stdout] 211 |       fn pop(&mut self) -> Result<Option<T>, Self::Error> {
[INFO] [stdout]     |  _________________________________________________________^
[INFO] [stdout] 212 | |         Ok(self.pop())
[INFO] [stdout] 213 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<T>, WillPanic>
[INFO] [stdout]    --> src/traits.rs:212:9
[INFO] [stdout]     |
[INFO] [stdout] 212 |         Ok(self.pop())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/wrapper.rs:62:13
[INFO] [stdout]    |
[INFO] [stdout] 62 |     fn iter(&self) -> SliceIter<T> {
[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] 62 |     fn iter(&self) -> SliceIter<'_, T> {
[INFO] [stdout]    |                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/wrapper.rs:98:17
[INFO] [stdout]    |
[INFO] [stdout] 98 |     fn iter_mut(&mut self) -> SliceIterMut<T> {
[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] 98 |     fn iter_mut(&mut self) -> SliceIterMut<'_, T> {
[INFO] [stdout]    |                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/traits.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |     fn iter(&self) -> SliceIter<T>;
[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] 32 |     fn iter(&self) -> SliceIter<'_, T>;
[INFO] [stdout]    |                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/traits.rs:55:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |     fn iter_mut(&mut self) -> SliceIterMut<T>;
[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] 55 |     fn iter_mut(&mut self) -> SliceIterMut<'_, T>;
[INFO] [stdout]    |                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `checked_array` (lib) due to 4 previous errors; 5 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<T>, WillPanic>
[INFO] [stdout]    --> src/traits.rs:204:49
[INFO] [stdout]     |
[INFO] [stdout] 204 |       fn alloc_new() -> Result<Self, Self::Error> {
[INFO] [stdout]     |  _________________________________________________^
[INFO] [stdout] 205 | |         Ok(Self::new())
[INFO] [stdout] 206 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<T>, WillPanic>
[INFO] [stdout]    --> src/traits.rs:205:9
[INFO] [stdout]     |
[INFO] [stdout] 205 |         Ok(Self::new())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<T>, WillPanic>
[INFO] [stdout]    --> src/traits.rs:211:57
[INFO] [stdout]     |
[INFO] [stdout] 211 |       fn pop(&mut self) -> Result<Option<T>, Self::Error> {
[INFO] [stdout]     |  _________________________________________________________^
[INFO] [stdout] 212 | |         Ok(self.pop())
[INFO] [stdout] 213 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<T>, WillPanic>
[INFO] [stdout]    --> src/traits.rs:212:9
[INFO] [stdout]     |
[INFO] [stdout] 212 |         Ok(self.pop())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/wrapper.rs:62:13
[INFO] [stdout]    |
[INFO] [stdout] 62 |     fn iter(&self) -> SliceIter<T> {
[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] 62 |     fn iter(&self) -> SliceIter<'_, T> {
[INFO] [stdout]    |                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/wrapper.rs:98:17
[INFO] [stdout]    |
[INFO] [stdout] 98 |     fn iter_mut(&mut self) -> SliceIterMut<T> {
[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] 98 |     fn iter_mut(&mut self) -> SliceIterMut<'_, T> {
[INFO] [stdout]    |                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `checked_array` (lib test) due to 4 previous errors; 5 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "5fced229e49cb02657e9867e4854afac45feec71ffac32dab8a33e9955e4edca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5fced229e49cb02657e9867e4854afac45feec71ffac32dab8a33e9955e4edca", kill_on_drop: false }`
[INFO] [stdout] 5fced229e49cb02657e9867e4854afac45feec71ffac32dab8a33e9955e4edca