[INFO] fetching crate mech-matrix 0.3.4...
[INFO] checking mech-matrix-0.3.4 against 1.95.0 for pr-155915
[INFO] extracting crate mech-matrix 0.3.4 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate mech-matrix 0.3.4
[INFO] finished tweaking crates.io crate mech-matrix 0.3.4
[INFO] tweaked toml for crates.io crate mech-matrix 0.3.4 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate mech-matrix 0.3.4 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate mech-matrix 0.3.4 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" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rlibc v1.0.0
[INFO] [stderr]   Downloaded mech-core v0.3.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 521a0c842e707665085a00acced58aa268c45317e85709ba7c34a68603efe7e8
[INFO] running `Command { std: "docker" "start" "-a" "521a0c842e707665085a00acced58aa268c45317e85709ba7c34a68603efe7e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "521a0c842e707665085a00acced58aa268c45317e85709ba7c34a68603efe7e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "521a0c842e707665085a00acced58aa268c45317e85709ba7c34a68603efe7e8", kill_on_drop: false }`
[INFO] [stdout] 521a0c842e707665085a00acced58aa268c45317e85709ba7c34a68603efe7e8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b0d127187019fd878aa11356036cac537001ebf403f60238a0da9fef02f39c78
[INFO] running `Command { std: "docker" "start" "-a" "b0d127187019fd878aa11356036cac537001ebf403f60238a0da9fef02f39c78", kill_on_drop: false }`
[INFO] [stderr]     Checking bytemuck v1.25.0
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]     Checking testing_table v0.3.0
[INFO] [stderr]     Checking seahash v4.1.0
[INFO] [stderr]     Checking inventory v0.3.24
[INFO] [stderr]     Checking approx v0.5.1
[INFO] [stderr]     Checking indexmap v2.14.0
[INFO] [stderr]    Compiling proc-macro-error2 v2.0.1
[INFO] [stderr]    Compiling nalgebra-macros v0.3.0
[INFO] [stderr]     Checking num-rational v0.4.2
[INFO] [stderr]     Checking safe_arch v0.7.4
[INFO] [stderr]    Compiling tabled_derive v0.11.0
[INFO] [stderr]     Checking wide v0.7.33
[INFO] [stderr]     Checking bincode v2.0.1
[INFO] [stderr]     Checking tabled v0.20.0
[INFO] [stderr]     Checking simba v0.9.1
[INFO] [stderr]     Checking nalgebra v0.34.2
[INFO] [stderr]     Checking mech-core v0.3.4
[INFO] [stderr]     Checking mech-matrix v0.3.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(where_clause_attrs)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(where_clause_attrs)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mech-matrix` (lib test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mech-matrix` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "b0d127187019fd878aa11356036cac537001ebf403f60238a0da9fef02f39c78", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b0d127187019fd878aa11356036cac537001ebf403f60238a0da9fef02f39c78", kill_on_drop: false }`
[INFO] [stdout] b0d127187019fd878aa11356036cac537001ebf403f60238a0da9fef02f39c78
