[INFO] fetching crate forma_core 0.1.0...
[INFO] checking forma_core-0.1.0 against try#0611f7de057c584b8771102fde7aed6c70c71d3b for pr-146440
[INFO] extracting crate forma_core 0.1.0 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate forma_core 0.1.0
[INFO] finished tweaking crates.io crate forma_core 0.1.0
[INFO] tweaked toml for crates.io crate forma_core 0.1.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate forma_core 0.1.0 on toolchain 0611f7de057c584b8771102fde7aed6c70c71d3b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0611f7de057c584b8771102fde7aed6c70c71d3b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate forma_core 0.1.0 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" "+0611f7de057c584b8771102fde7aed6c70c71d3b" "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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0611f7de057c584b8771102fde7aed6c70c71d3b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e7d3a0eb71c8e3883cd6fc75b33c41afaf8b3236d6b7d894a48dd849485f6403
[INFO] running `Command { std: "docker" "start" "-a" "e7d3a0eb71c8e3883cd6fc75b33c41afaf8b3236d6b7d894a48dd849485f6403", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e7d3a0eb71c8e3883cd6fc75b33c41afaf8b3236d6b7d894a48dd849485f6403", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7d3a0eb71c8e3883cd6fc75b33c41afaf8b3236d6b7d894a48dd849485f6403", kill_on_drop: false }`
[INFO] [stdout] e7d3a0eb71c8e3883cd6fc75b33c41afaf8b3236d6b7d894a48dd849485f6403
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0611f7de057c584b8771102fde7aed6c70c71d3b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e76a4c0fe6164fa37b8e2c3cf33c1fb52bf6ef6ae517aa96eca56247ebee0632
[INFO] running `Command { std: "docker" "start" "-a" "e76a4c0fe6164fa37b8e2c3cf33c1fb52bf6ef6ae517aa96eca56247ebee0632", kill_on_drop: false }`
[INFO] [stderr]     Checking forma_core v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: struct `Impossible` is never constructed
[INFO] [stdout]    --> src/ser.rs:316:12
[INFO] [stdout]     |
[INFO] [stdout] 316 | pub struct Impossible<Ok, Error> {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout]     = note: `#[deny(unused_unconstructable_pub_struct)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `forma_core` (lib test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: struct `Impossible` is never constructed
[INFO] [stdout]    --> src/ser.rs:316:12
[INFO] [stdout]     |
[INFO] [stdout] 316 | pub struct Impossible<Ok, Error> {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout]     = note: `#[deny(unused_unconstructable_pub_struct)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `forma_core` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "e76a4c0fe6164fa37b8e2c3cf33c1fb52bf6ef6ae517aa96eca56247ebee0632", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e76a4c0fe6164fa37b8e2c3cf33c1fb52bf6ef6ae517aa96eca56247ebee0632", kill_on_drop: false }`
[INFO] [stdout] e76a4c0fe6164fa37b8e2c3cf33c1fb52bf6ef6ae517aa96eca56247ebee0632
