[INFO] cloning repository https://github.com/c3potheds/cocoro
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/c3potheds/cocoro" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fc3potheds%2Fcocoro", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fc3potheds%2Fcocoro'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7ab1da12550f30f03f7c7fd24392f21d7e141875
[INFO] checking c3potheds/cocoro against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fc3potheds%2Fcocoro" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/c3potheds/cocoro
[INFO] removed 0 missing examples
[INFO] finished tweaking git repo https://github.com/c3potheds/cocoro
[INFO] tweaked toml for git repo https://github.com/c3potheds/cocoro written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/c3potheds/cocoro 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] crate git repo https://github.com/c3potheds/cocoro already has a lockfile, it will not be regenerated
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] fb140e19792f39217c5a0cf0370190a7294113f495ad852cfcead46b6b3b0136
[INFO] running `Command { std: "docker" "start" "-a" "fb140e19792f39217c5a0cf0370190a7294113f495ad852cfcead46b6b3b0136", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fb140e19792f39217c5a0cf0370190a7294113f495ad852cfcead46b6b3b0136", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb140e19792f39217c5a0cf0370190a7294113f495ad852cfcead46b6b3b0136", kill_on_drop: false }`
[INFO] [stdout] fb140e19792f39217c5a0cf0370190a7294113f495ad852cfcead46b6b3b0136
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] c08e373ee359bfbb36e7818d8806dec5c7a5cca5468cddeacc8b4b1b66f3a6b0
[INFO] running `Command { std: "docker" "start" "-a" "c08e373ee359bfbb36e7818d8806dec5c7a5cca5468cddeacc8b4b1b66f3a6b0", kill_on_drop: false }`
[INFO] [stderr]     Checking either v1.15.0
[INFO] [stderr]     Checking cocoro v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<void::Void, i32>
[INFO] [stdout]   --> src/test.rs:89:27
[INFO] [stdout]    |
[INFO] [stdout] 89 |     from_control_flow(|x| Continue(x * 2))
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `AtomParser` is never constructed
[INFO] [stdout]   --> examples/sexpr_parser.rs:88:8
[INFO] [stdout]    |
[INFO] [stdout] 88 | struct AtomParser(String);
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ListParser` is never constructed
[INFO] [stdout]    --> examples/sexpr_parser.rs:254:8
[INFO] [stdout]     |
[INFO] [stdout] 254 | struct ListParser {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cocoro` (lib test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: variant `Numbers` is never constructed
[INFO] [stdout]   --> examples/simple_weave.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | enum ParseResult {
[INFO] [stdout]    |      ----------- variant in this enum
[INFO] [stdout] 22 |     Words(Vec<String>),
[INFO] [stdout] 23 |     Numbers(Vec<i32>),
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ParseResult` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NumberCollector` is never constructed
[INFO] [stdout]    --> examples/simple_weave.rs:171:8
[INFO] [stdout]     |
[INFO] [stdout] 171 | struct NumberCollector {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "c08e373ee359bfbb36e7818d8806dec5c7a5cca5468cddeacc8b4b1b66f3a6b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c08e373ee359bfbb36e7818d8806dec5c7a5cca5468cddeacc8b4b1b66f3a6b0", kill_on_drop: false }`
[INFO] [stdout] c08e373ee359bfbb36e7818d8806dec5c7a5cca5468cddeacc8b4b1b66f3a6b0