[INFO] fetching crate nostd_async 0.6.1...
[INFO] checking nostd_async-0.6.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate nostd_async 0.6.1 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate nostd_async 0.6.1 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate nostd_async 0.6.1
[INFO] finished tweaking crates.io crate nostd_async 0.6.1
[INFO] tweaked toml for crates.io crate nostd_async 0.6.1 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate crates.io crate nostd_async 0.6.1 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded volatile-register v0.2.1
[INFO] [stderr]   Downloaded futures-micro v0.5.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 36618ef9ca9a2ff4f0afd85a4287af745468987c9416063791fd4f37ea09f7a3
[INFO] running `Command { std: "docker" "start" "-a" "36618ef9ca9a2ff4f0afd85a4287af745468987c9416063791fd4f37ea09f7a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "36618ef9ca9a2ff4f0afd85a4287af745468987c9416063791fd4f37ea09f7a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "36618ef9ca9a2ff4f0afd85a4287af745468987c9416063791fd4f37ea09f7a3", kill_on_drop: false }`
[INFO] [stdout] 36618ef9ca9a2ff4f0afd85a4287af745468987c9416063791fd4f37ea09f7a3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9eab42b75f070139acce9cad398e11d6db8eee6a2d324e8c72c60271eca4f5d5
[INFO] running `Command { std: "docker" "start" "-a" "9eab42b75f070139acce9cad398e11d6db8eee6a2d324e8c72c60271eca4f5d5", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking pin-project-lite v0.2.9
[INFO] [stderr]     Checking futures-micro v0.5.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]     Checking nostd_async v0.6.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `insert_front` is never used
[INFO] [stdout]   --> src/linked_list.rs:98:8
[INFO] [stdout]    |
[INFO] [stdout] 81 | pub trait LinkedListItem: Sized {
[INFO] [stdout]    |           -------------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 98 |     fn insert_front(&self, cs: &CriticalSection) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.10s
[INFO] running `Command { std: "docker" "inspect" "9eab42b75f070139acce9cad398e11d6db8eee6a2d324e8c72c60271eca4f5d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9eab42b75f070139acce9cad398e11d6db8eee6a2d324e8c72c60271eca4f5d5", kill_on_drop: false }`
[INFO] [stdout] 9eab42b75f070139acce9cad398e11d6db8eee6a2d324e8c72c60271eca4f5d5
[INFO] checking nostd_async-0.6.1 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate nostd_async 0.6.1 into /workspace/builds/worker-0-tc2/source
[INFO] validating manifest of crates.io crate nostd_async 0.6.1 on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate nostd_async 0.6.1
[INFO] finished tweaking crates.io crate nostd_async 0.6.1
[INFO] tweaked toml for crates.io crate nostd_async 0.6.1 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate crates.io crate nostd_async 0.6.1 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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b2d365613085e3a03cb7151648a6c821c0d37ab2b447a9dbcde93a97a3b26043
[INFO] running `Command { std: "docker" "start" "-a" "b2d365613085e3a03cb7151648a6c821c0d37ab2b447a9dbcde93a97a3b26043", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b2d365613085e3a03cb7151648a6c821c0d37ab2b447a9dbcde93a97a3b26043", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2d365613085e3a03cb7151648a6c821c0d37ab2b447a9dbcde93a97a3b26043", kill_on_drop: false }`
[INFO] [stdout] b2d365613085e3a03cb7151648a6c821c0d37ab2b447a9dbcde93a97a3b26043
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4f7d0c1dea41c20ea39f1b81d8524e528739bc8f4e7b9ab2b0d64a4a2e6ac635
[INFO] running `Command { std: "docker" "start" "-a" "4f7d0c1dea41c20ea39f1b81d8524e528739bc8f4e7b9ab2b0d64a4a2e6ac635", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking pin-project-lite v0.2.9
[INFO] [stderr]     Checking futures-micro v0.5.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]     Checking nostd_async v0.6.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `insert_front` is never used
[INFO] [stdout]   --> src/linked_list.rs:98:8
[INFO] [stdout]    |
[INFO] [stdout] 81 | pub trait LinkedListItem: Sized {
[INFO] [stdout]    |           -------------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 98 |     fn insert_front(&self, cs: &CriticalSection) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.35s
[INFO] running `Command { std: "docker" "inspect" "4f7d0c1dea41c20ea39f1b81d8524e528739bc8f4e7b9ab2b0d64a4a2e6ac635", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f7d0c1dea41c20ea39f1b81d8524e528739bc8f4e7b9ab2b0d64a4a2e6ac635", kill_on_drop: false }`
[INFO] [stdout] 4f7d0c1dea41c20ea39f1b81d8524e528739bc8f4e7b9ab2b0d64a4a2e6ac635