[INFO] fetching crate flexver-rs 0.1.2...
[INFO] checking flexver-rs-0.1.2 against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] extracting crate flexver-rs 0.1.2 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate flexver-rs 0.1.2
[INFO] finished tweaking crates.io crate flexver-rs 0.1.2
[INFO] tweaked toml for crates.io crate flexver-rs 0.1.2 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate flexver-rs 0.1.2 on toolchain 998b6603a58e47f42ccce7a67943234e96b6839e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "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" "+998b6603a58e47f42ccce7a67943234e96b6839e" "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" "+998b6603a58e47f42ccce7a67943234e96b6839e" "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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8722a9493255e05df7d8b024c7014709f6f98c7661b4bc7dd8fd3048dab93e12
[INFO] running `Command { std: "docker" "start" "-a" "8722a9493255e05df7d8b024c7014709f6f98c7661b4bc7dd8fd3048dab93e12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8722a9493255e05df7d8b024c7014709f6f98c7661b4bc7dd8fd3048dab93e12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8722a9493255e05df7d8b024c7014709f6f98c7661b4bc7dd8fd3048dab93e12", kill_on_drop: false }`
[INFO] [stdout] 8722a9493255e05df7d8b024c7014709f6f98c7661b4bc7dd8fd3048dab93e12
[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" "-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6dd7d2b9a51951621f5a5e17c142ca485c9d73d4faca37e35234ae6b04c1bab1
[INFO] running `Command { std: "docker" "start" "-a" "6dd7d2b9a51951621f5a5e17c142ca485c9d73d4faca37e35234ae6b04c1bab1", kill_on_drop: false }`
[INFO] [stderr]     Checking flexver-rs v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]   --> src/lib.rs:27:28
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn split_once_rest<'a>(s: &'a str, numeric: bool) -> Option<(&str, &str)> {
[INFO] [stdout]    |                            ^^                                ----  ---- the lifetimes get resolved as `'a`
[INFO] [stdout]    |                            |                                 |
[INFO] [stdout]    |                            |                                 the lifetimes get resolved as `'a`
[INFO] [stdout]    |                            this lifetime flows to the output
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn split_once_rest<'a>(s: &'a str, numeric: bool) -> Option<(&'a str, &'a str)> {
[INFO] [stdout]    |                                                               ++       ++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]   --> src/lib.rs:27:28
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn split_once_rest<'a>(s: &'a str, numeric: bool) -> Option<(&str, &str)> {
[INFO] [stdout]    |                            ^^                                ----  ---- the lifetimes get resolved as `'a`
[INFO] [stdout]    |                            |                                 |
[INFO] [stdout]    |                            |                                 the lifetimes get resolved as `'a`
[INFO] [stdout]    |                            this lifetime flows to the output
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn split_once_rest<'a>(s: &'a str, numeric: bool) -> Option<(&'a str, &'a str)> {
[INFO] [stdout]    |                                                               ++       ++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.24s
[INFO] running `Command { std: "docker" "inspect" "6dd7d2b9a51951621f5a5e17c142ca485c9d73d4faca37e35234ae6b04c1bab1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6dd7d2b9a51951621f5a5e17c142ca485c9d73d4faca37e35234ae6b04c1bab1", kill_on_drop: false }`
[INFO] [stdout] 6dd7d2b9a51951621f5a5e17c142ca485c9d73d4faca37e35234ae6b04c1bab1