[INFO] fetching crate ringbuffer-spsc 0.1.9...
[INFO] checking ringbuffer-spsc-0.1.9 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate ringbuffer-spsc 0.1.9 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate ringbuffer-spsc 0.1.9 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 ringbuffer-spsc 0.1.9
[INFO] finished tweaking crates.io crate ringbuffer-spsc 0.1.9
[INFO] tweaked toml for crates.io crate ringbuffer-spsc 0.1.9 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate crates.io crate ringbuffer-spsc 0.1.9 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]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded cache-padded v1.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] a035a83dd8fb7af94269fc8996a57467b305b20114c5ddc01c1bab442dcf6151
[INFO] running `Command { std: "docker" "start" "-a" "a035a83dd8fb7af94269fc8996a57467b305b20114c5ddc01c1bab442dcf6151", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a035a83dd8fb7af94269fc8996a57467b305b20114c5ddc01c1bab442dcf6151", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a035a83dd8fb7af94269fc8996a57467b305b20114c5ddc01c1bab442dcf6151", kill_on_drop: false }`
[INFO] [stdout] a035a83dd8fb7af94269fc8996a57467b305b20114c5ddc01c1bab442dcf6151
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 3c925cbffe09573167e6d55678f669e6557d4c80d72d37d0296f7ad9c722e73d
[INFO] running `Command { std: "docker" "start" "-a" "3c925cbffe09573167e6d55678f669e6557d4c80d72d37d0296f7ad9c722e73d", kill_on_drop: false }`
[INFO] [stderr]     Checking cache-padded v1.2.0
[INFO] [stderr]     Checking ringbuffer-spsc v0.1.9 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `core::mem::replace` that must be used
[INFO] [stdout]    --> src/lib.rs:138:18
[INFO] [stdout]     |
[INFO] [stdout] 138 |         unsafe { mem::replace(self.inner.get_mut(self.local_idx_w), MaybeUninit::new(t)) };
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 138 |         unsafe { let _ = mem::replace(self.inner.get_mut(self.local_idx_w), MaybeUninit::new(t)); };
[INFO] [stdout]     |                  +++++++                                                                        +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `core::mem::replace` that must be used
[INFO] [stdout]    --> src/lib.rs:138:18
[INFO] [stdout]     |
[INFO] [stdout] 138 |         unsafe { mem::replace(self.inner.get_mut(self.local_idx_w), MaybeUninit::new(t)) };
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 138 |         unsafe { let _ = mem::replace(self.inner.get_mut(self.local_idx_w), MaybeUninit::new(t)); };
[INFO] [stdout]     |                  +++++++                                                                        +
[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 0.29s
[INFO] running `Command { std: "docker" "inspect" "3c925cbffe09573167e6d55678f669e6557d4c80d72d37d0296f7ad9c722e73d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c925cbffe09573167e6d55678f669e6557d4c80d72d37d0296f7ad9c722e73d", kill_on_drop: false }`
[INFO] [stdout] 3c925cbffe09573167e6d55678f669e6557d4c80d72d37d0296f7ad9c722e73d
[INFO] checking ringbuffer-spsc-0.1.9 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate ringbuffer-spsc 0.1.9 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate ringbuffer-spsc 0.1.9 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 ringbuffer-spsc 0.1.9
[INFO] finished tweaking crates.io crate ringbuffer-spsc 0.1.9
[INFO] tweaked toml for crates.io crate ringbuffer-spsc 0.1.9 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate crates.io crate ringbuffer-spsc 0.1.9 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] 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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f390ff23fe27149b833acd08ae8b19634ad936ad9b9ea17153bf22fb311ac447
[INFO] running `Command { std: "docker" "start" "-a" "f390ff23fe27149b833acd08ae8b19634ad936ad9b9ea17153bf22fb311ac447", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f390ff23fe27149b833acd08ae8b19634ad936ad9b9ea17153bf22fb311ac447", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f390ff23fe27149b833acd08ae8b19634ad936ad9b9ea17153bf22fb311ac447", kill_on_drop: false }`
[INFO] [stdout] f390ff23fe27149b833acd08ae8b19634ad936ad9b9ea17153bf22fb311ac447
[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" "-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] 687b82a9d4708e120838bb372eae6783db2e07320eb6ddc75f00d697bfde271e
[INFO] running `Command { std: "docker" "start" "-a" "687b82a9d4708e120838bb372eae6783db2e07320eb6ddc75f00d697bfde271e", kill_on_drop: false }`
[INFO] [stderr]     Checking cache-padded v1.2.0
[INFO] [stderr]     Checking ringbuffer-spsc v0.1.9 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `core::mem::replace` that must be used
[INFO] [stdout]    --> src/lib.rs:138:18
[INFO] [stdout]     |
[INFO] [stdout] 138 |         unsafe { mem::replace(self.inner.get_mut(self.local_idx_w), MaybeUninit::new(t)) };
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 138 |         unsafe { let _ = mem::replace(self.inner.get_mut(self.local_idx_w), MaybeUninit::new(t)); };
[INFO] [stdout]     |                  +++++++                                                                        +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `core::mem::replace` that must be used
[INFO] [stdout]    --> src/lib.rs:138:18
[INFO] [stdout]     |
[INFO] [stdout] 138 |         unsafe { mem::replace(self.inner.get_mut(self.local_idx_w), MaybeUninit::new(t)) };
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 138 |         unsafe { let _ = mem::replace(self.inner.get_mut(self.local_idx_w), MaybeUninit::new(t)); };
[INFO] [stdout]     |                  +++++++                                                                        +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.28s
[INFO] running `Command { std: "docker" "inspect" "687b82a9d4708e120838bb372eae6783db2e07320eb6ddc75f00d697bfde271e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "687b82a9d4708e120838bb372eae6783db2e07320eb6ddc75f00d697bfde271e", kill_on_drop: false }`
[INFO] [stdout] 687b82a9d4708e120838bb372eae6783db2e07320eb6ddc75f00d697bfde271e