[INFO] fetching crate refer 0.1.3...
[INFO] checking refer-0.1.3 against master#f167efad2f51088d86180ee89177b3d7c9e7c2f5 for pr-129543
[INFO] extracting crate refer 0.1.3 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate refer 0.1.3 on toolchain f167efad2f51088d86180ee89177b3d7c9e7c2f5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate refer 0.1.3
[INFO] finished tweaking crates.io crate refer 0.1.3
[INFO] tweaked toml for crates.io crate refer 0.1.3 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 4 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "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-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a8b98bf4d4c195e5378f26b4192bed9fc23210b12695a3a48fafca2da5306d91
[INFO] running `Command { std: "docker" "start" "-a" "a8b98bf4d4c195e5378f26b4192bed9fc23210b12695a3a48fafca2da5306d91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a8b98bf4d4c195e5378f26b4192bed9fc23210b12695a3a48fafca2da5306d91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a8b98bf4d4c195e5378f26b4192bed9fc23210b12695a3a48fafca2da5306d91", kill_on_drop: false }`
[INFO] [stdout] a8b98bf4d4c195e5378f26b4192bed9fc23210b12695a3a48fafca2da5306d91
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 724b62a2d6ce3964dd675c220f710a6828d1e6707b00b49d5c631c679d41b240
[INFO] running `Command { std: "docker" "start" "-a" "724b62a2d6ce3964dd675c220f710a6828d1e6707b00b49d5c631c679d41b240", kill_on_drop: false }`
[INFO] [stderr]     Checking minimal-lexical v0.2.1
[INFO] [stderr]     Checking memchr v2.7.4
[INFO] [stderr]     Checking nom v7.1.3
[INFO] [stderr]     Checking refer v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/reader.rs:422:9
[INFO] [stdout]     |
[INFO] [stdout] 422 |         e => {
[INFO] [stdout]     |         ^ no value can reach this
[INFO] [stdout]     |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]    --> src/reader.rs:422:9
[INFO] [stdout]     |
[INFO] [stdout] 399 |         0..=1 => {
[INFO] [stdout]     |         ----- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 405 |         2 => Ok(Author {
[INFO] [stdout]     |         - matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 409 |         n @ 3.. => {
[INFO] [stdout]     |             --- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 422 |         e => {
[INFO] [stdout]     |         ^ collectively making this unreachable
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/reader.rs:422:9
[INFO] [stdout]     |
[INFO] [stdout] 422 |         e => {
[INFO] [stdout]     |         ^ no value can reach this
[INFO] [stdout]     |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]    --> src/reader.rs:422:9
[INFO] [stdout]     |
[INFO] [stdout] 399 |         0..=1 => {
[INFO] [stdout]     |         ----- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 405 |         2 => Ok(Author {
[INFO] [stdout]     |         - matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 409 |         n @ 3.. => {
[INFO] [stdout]     |             --- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 422 |         e => {
[INFO] [stdout]     |         ^ collectively making this unreachable
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.75s
[INFO] running `Command { std: "docker" "inspect" "724b62a2d6ce3964dd675c220f710a6828d1e6707b00b49d5c631c679d41b240", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "724b62a2d6ce3964dd675c220f710a6828d1e6707b00b49d5c631c679d41b240", kill_on_drop: false }`
[INFO] [stdout] 724b62a2d6ce3964dd675c220f710a6828d1e6707b00b49d5c631c679d41b240