[INFO] fetching crate quickjs_regex_derive 0.1.2...
[INFO] checking quickjs_regex_derive-0.1.2 against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] extracting crate quickjs_regex_derive 0.1.2 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate quickjs_regex_derive 0.1.2
[INFO] finished tweaking crates.io crate quickjs_regex_derive 0.1.2
[INFO] tweaked toml for crates.io crate quickjs_regex_derive 0.1.2 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate quickjs_regex_derive 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] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 24 packages to latest compatible versions
[INFO] [stderr]       Adding proc-macro-crate v1.3.1 (available: v3.3.0)
[INFO] [stderr]       Adding syn v1.0.109 (available: v2.0.104)
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 463f9b0cdddfd12e1f6d73d299df5a8ef19fcf9fbd724359ce7466c13a4d1606
[INFO] running `Command { std: "docker" "start" "-a" "463f9b0cdddfd12e1f6d73d299df5a8ef19fcf9fbd724359ce7466c13a4d1606", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "463f9b0cdddfd12e1f6d73d299df5a8ef19fcf9fbd724359ce7466c13a4d1606", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "463f9b0cdddfd12e1f6d73d299df5a8ef19fcf9fbd724359ce7466c13a4d1606", kill_on_drop: false }`
[INFO] [stdout] 463f9b0cdddfd12e1f6d73d299df5a8ef19fcf9fbd724359ce7466c13a4d1606
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 26bccccd9b4e721f13ed8f976cbe3c147830ee67330c477318d2cd2eac4ee063
[INFO] running `Command { std: "docker" "start" "-a" "26bccccd9b4e721f13ed8f976cbe3c147830ee67330c477318d2cd2eac4ee063", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.174
[INFO] [stderr]     Checking equivalent v1.0.2
[INFO] [stderr]     Checking hashbrown v0.15.4
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking winnow v0.5.40
[INFO] [stderr]     Checking toml_datetime v0.6.11
[INFO] [stderr]     Checking once_cell v1.21.3
[INFO] [stderr]     Checking indexmap v2.10.0
[INFO] [stderr]    Compiling jobserver v0.1.33
[INFO] [stderr]    Compiling cc v1.2.27
[INFO] [stderr]     Checking toml_edit v0.19.15
[INFO] [stderr]    Compiling quickjs_regex_backend v0.1.0
[INFO] [stderr]     Checking proc-macro-crate v1.3.1
[INFO] [stderr]     Checking quickjs_regex_derive v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]   --> src/lib.rs:21:15
[INFO] [stdout]    |
[INFO] [stdout] 21 |     for ch in param.chars().next() {
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to iterate over `param.chars()` remove the call to `next`
[INFO] [stdout]    |
[INFO] [stdout] 21 -     for ch in param.chars().next() {
[INFO] [stdout] 21 +     for ch in param.chars().by_ref() {
[INFO] [stdout]    |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    |
[INFO] [stdout] 21 -     for ch in param.chars().next() {
[INFO] [stdout] 21 +     if let Some(ch) = param.chars().next() {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]   --> src/lib.rs:21:15
[INFO] [stdout]    |
[INFO] [stdout] 21 |     for ch in param.chars().next() {
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to iterate over `param.chars()` remove the call to `next`
[INFO] [stdout]    |
[INFO] [stdout] 21 -     for ch in param.chars().next() {
[INFO] [stdout] 21 +     for ch in param.chars().by_ref() {
[INFO] [stdout]    |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    |
[INFO] [stdout] 21 -     for ch in param.chars().next() {
[INFO] [stdout] 21 +     if let Some(ch) = param.chars().next() {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.96s
[INFO] running `Command { std: "docker" "inspect" "26bccccd9b4e721f13ed8f976cbe3c147830ee67330c477318d2cd2eac4ee063", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26bccccd9b4e721f13ed8f976cbe3c147830ee67330c477318d2cd2eac4ee063", kill_on_drop: false }`
[INFO] [stdout] 26bccccd9b4e721f13ed8f976cbe3c147830ee67330c477318d2cd2eac4ee063