[INFO] fetching crate mielin-rt 0.1.0-rc.1...
[INFO] checking mielin-rt-0.1.0-rc.1 against try#93086cfebfccb79083c59d0d3b2052944bba643c for pr-146440-1
[INFO] extracting crate mielin-rt 0.1.0-rc.1 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate mielin-rt 0.1.0-rc.1
[INFO] finished tweaking crates.io crate mielin-rt 0.1.0-rc.1
[INFO] tweaked toml for crates.io crate mielin-rt 0.1.0-rc.1 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate mielin-rt 0.1.0-rc.1 on toolchain 93086cfebfccb79083c59d0d3b2052944bba643c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate mielin-rt 0.1.0-rc.1 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" "+93086cfebfccb79083c59d0d3b2052944bba643c" "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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c4d4c54d9a025373174eef1d9f45e8aaf6420e76bd8fd6ba7b49693394d62af6
[INFO] running `Command { std: "docker" "start" "-a" "c4d4c54d9a025373174eef1d9f45e8aaf6420e76bd8fd6ba7b49693394d62af6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c4d4c54d9a025373174eef1d9f45e8aaf6420e76bd8fd6ba7b49693394d62af6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c4d4c54d9a025373174eef1d9f45e8aaf6420e76bd8fd6ba7b49693394d62af6", kill_on_drop: false }`
[INFO] [stdout] c4d4c54d9a025373174eef1d9f45e8aaf6420e76bd8fd6ba7b49693394d62af6
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6e0ed79d3f30ee8f2690950c7a8cde622041ec4f0ab2c724ac1493cd6418c3ed
[INFO] running `Command { std: "docker" "start" "-a" "6e0ed79d3f30ee8f2690950c7a8cde622041ec4f0ab2c724ac1493cd6418c3ed", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking nb v1.1.0
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling cortex-m v0.7.7
[INFO] [stderr]    Compiling cortex-m-rt v0.7.5
[INFO] [stderr]    Compiling heapless v0.9.2
[INFO] [stderr]     Checking vcell v0.1.3
[INFO] [stderr]     Checking spin v0.9.8
[INFO] [stderr]     Checking lazy_static v1.5.0
[INFO] [stderr]     Checking hash32 v0.3.1
[INFO] [stderr]     Checking volatile-register v0.2.2
[INFO] [stderr]    Compiling cortex-m-rt-macros v0.7.5
[INFO] [stderr]     Checking nb v0.1.3
[INFO] [stderr]     Checking spin v0.10.0
[INFO] [stderr]     Checking bitfield v0.13.2
[INFO] [stderr]     Checking mielin-hal v0.1.0-rc.1
[INFO] [stderr]     Checking embedded-hal v0.2.7
[INFO] [stderr]     Checking embedded-hal v1.0.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]     Checking mielin-kernel v0.1.0-rc.1
[INFO] [stderr]     Checking panic-halt v1.0.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]     Checking mielin-rt v0.1.0-rc.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: struct `Pool` is never constructed
[INFO] [stdout]    --> src/pool/types.rs:719:12
[INFO] [stdout]     |
[INFO] [stdout] 719 | pub struct Pool {
[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_structs)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mielin-rt` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: struct `Pool` is never constructed
[INFO] [stdout]    --> src/pool/types.rs:719:12
[INFO] [stdout]     |
[INFO] [stdout] 719 | pub struct Pool {
[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_structs)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mielin-rt` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "6e0ed79d3f30ee8f2690950c7a8cde622041ec4f0ab2c724ac1493cd6418c3ed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e0ed79d3f30ee8f2690950c7a8cde622041ec4f0ab2c724ac1493cd6418c3ed", kill_on_drop: false }`
[INFO] [stdout] 6e0ed79d3f30ee8f2690950c7a8cde622041ec4f0ab2c724ac1493cd6418c3ed
