[INFO] fetching crate crawdad 0.4.0...
[INFO] checking crawdad-0.4.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate crawdad 0.4.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate crawdad 0.4.0
[INFO] finished tweaking crates.io crate crawdad 0.4.0
[INFO] tweaked toml for crates.io crate crawdad 0.4.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate crawdad 0.4.0 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] 4ffb00c09af87e0544e4296794edcc82a0681e47151041d99d7883ede64f16f6
[INFO] running `Command { std: "docker" "start" "-a" "4ffb00c09af87e0544e4296794edcc82a0681e47151041d99d7883ede64f16f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4ffb00c09af87e0544e4296794edcc82a0681e47151041d99d7883ede64f16f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ffb00c09af87e0544e4296794edcc82a0681e47151041d99d7883ede64f16f6", kill_on_drop: false }`
[INFO] [stdout] 4ffb00c09af87e0544e4296794edcc82a0681e47151041d99d7883ede64f16f6
[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] ae71b0d030392fb3049b8cf7847d52abb365d5bd0b25e2058e46128f5e1d7eac
[INFO] running `Command { std: "docker" "start" "-a" "ae71b0d030392fb3049b8cf7847d52abb365d5bd0b25e2058e46128f5e1d7eac", kill_on_drop: false }`
[INFO] [stderr]     Checking crawdad v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/mptrie.rs:264:42
[INFO] [stdout]     |
[INFO] [stdout] 264 |     pub const fn common_prefix_search<I>(&self, haystack: I) -> CommonPrefixSearchIter<I> {
[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] 264 |     pub const fn common_prefix_search<I>(&self, haystack: I) -> CommonPrefixSearchIter<'_, I> {
[INFO] [stdout]     |                                                                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/mptrie.rs:274:18
[INFO] [stdout]     |
[INFO] [stdout] 274 |     fn tail_iter(&self, tail_pos: usize) -> TailIter {
[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] 274 |     fn tail_iter(&self, tail_pos: usize) -> TailIter<'_> {
[INFO] [stdout]     |                                                     ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: core::result::Result<usize, Infallible>
[INFO] [stdout]    --> src/mptrie.rs:275:24
[INFO] [stdout]     |
[INFO] [stdout] 275 |         let tail_len = usize::try_from(self.tails[tail_pos]).unwrap();
[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: core::result::Result<usize, Infallible>
[INFO] [stdout]    --> src/mptrie.rs:420:25
[INFO] [stdout]     |
[INFO] [stdout] 420 |             self.pos += usize::try_from(self.trie.code_size).unwrap();
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/trie.rs:220:42
[INFO] [stdout]     |
[INFO] [stdout] 220 |     pub const fn common_prefix_search<I>(&self, haystack: I) -> CommonPrefixSearchIter<I> {
[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] 220 |     pub const fn common_prefix_search<I>(&self, haystack: I) -> CommonPrefixSearchIter<'_, I> {
[INFO] [stdout]     |                                                                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `crawdad` (lib) due to 2 previous errors; 3 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/mptrie.rs:264:42
[INFO] [stdout]     |
[INFO] [stdout] 264 |     pub const fn common_prefix_search<I>(&self, haystack: I) -> CommonPrefixSearchIter<I> {
[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] 264 |     pub const fn common_prefix_search<I>(&self, haystack: I) -> CommonPrefixSearchIter<'_, I> {
[INFO] [stdout]     |                                                                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/mptrie.rs:274:18
[INFO] [stdout]     |
[INFO] [stdout] 274 |     fn tail_iter(&self, tail_pos: usize) -> TailIter {
[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] 274 |     fn tail_iter(&self, tail_pos: usize) -> TailIter<'_> {
[INFO] [stdout]     |                                                     ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: core::result::Result<usize, Infallible>
[INFO] [stdout]    --> src/mptrie.rs:275:24
[INFO] [stdout]     |
[INFO] [stdout] 275 |         let tail_len = usize::try_from(self.tails[tail_pos]).unwrap();
[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: core::result::Result<usize, Infallible>
[INFO] [stdout]    --> src/mptrie.rs:420:25
[INFO] [stdout]     |
[INFO] [stdout] 420 |             self.pos += usize::try_from(self.trie.code_size).unwrap();
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/trie.rs:220:42
[INFO] [stdout]     |
[INFO] [stdout] 220 |     pub const fn common_prefix_search<I>(&self, haystack: I) -> CommonPrefixSearchIter<I> {
[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] 220 |     pub const fn common_prefix_search<I>(&self, haystack: I) -> CommonPrefixSearchIter<'_, I> {
[INFO] [stdout]     |                                                                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `crawdad` (lib test) due to 2 previous errors; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "ae71b0d030392fb3049b8cf7847d52abb365d5bd0b25e2058e46128f5e1d7eac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ae71b0d030392fb3049b8cf7847d52abb365d5bd0b25e2058e46128f5e1d7eac", kill_on_drop: false }`
[INFO] [stdout] ae71b0d030392fb3049b8cf7847d52abb365d5bd0b25e2058e46128f5e1d7eac