[INFO] fetching crate mech-interpreter 0.2.64...
[INFO] testing mech-interpreter-0.2.64 against 1.91.0 for beta-1.92-2
[INFO] extracting crate mech-interpreter 0.2.64 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate mech-interpreter 0.2.64
[INFO] finished tweaking crates.io crate mech-interpreter 0.2.64
[INFO] tweaked toml for crates.io crate mech-interpreter 0.2.64 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate mech-interpreter 0.2.64 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate mech-interpreter 0.2.64 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" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mech-io v0.2.64
[INFO] [stderr]   Downloaded tabled_derive v0.10.0
[INFO] [stderr]   Downloaded rlibc v1.0.0
[INFO] [stderr]   Downloaded bincode_derive v2.0.1
[INFO] [stderr]   Downloaded mech-compare v0.2.64
[INFO] [stderr]   Downloaded mech-combinatorics v0.2.64
[INFO] [stderr]   Downloaded unty v0.0.4
[INFO] [stderr]   Downloaded nalgebra-macros v0.3.0
[INFO] [stderr]   Downloaded mech-matrix v0.2.64
[INFO] [stderr]   Downloaded mech-logic v0.2.64
[INFO] [stderr]   Downloaded mech-range v0.2.64
[INFO] [stderr]   Downloaded mech-set v0.2.64
[INFO] [stderr]   Downloaded mech-stats v0.2.64
[INFO] [stderr]   Downloaded virtue v0.0.18
[INFO] [stderr]   Downloaded bincode v2.0.1
[INFO] [stderr]   Downloaded mech-math v0.2.64
[INFO] [stderr]   Downloaded papergrid v0.14.0
[INFO] [stderr]   Downloaded glam v0.16.0
[INFO] [stderr]   Downloaded glam v0.14.0
[INFO] [stderr]   Downloaded glam v0.18.0
[INFO] [stderr]   Downloaded glam v0.15.2
[INFO] [stderr]   Downloaded mech-core v0.2.64
[INFO] [stderr]   Downloaded glam v0.20.5
[INFO] [stderr]   Downloaded glam v0.19.0
[INFO] [stderr]   Downloaded tabled v0.18.0
[INFO] [stderr]   Downloaded glam v0.21.3
[INFO] [stderr]   Downloaded glam v0.28.0
[INFO] [stderr]   Downloaded nalgebra v0.34.1
[INFO] [stderr]   Downloaded glam v0.30.8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 74b04cf24dc2c86b830712bffdc4e254de391aa1333284509955b729dbec9172
[INFO] running `Command { std: "docker" "start" "-a" "74b04cf24dc2c86b830712bffdc4e254de391aa1333284509955b729dbec9172", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "74b04cf24dc2c86b830712bffdc4e254de391aa1333284509955b729dbec9172", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74b04cf24dc2c86b830712bffdc4e254de391aa1333284509955b729dbec9172", kill_on_drop: false }`
[INFO] [stdout] 74b04cf24dc2c86b830712bffdc4e254de391aa1333284509955b729dbec9172
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 063a4fcee20adcc83ac3cf412a8398f193c23393dae04bc09132e5ed7bebc742
[INFO] running `Command { std: "docker" "start" "-a" "063a4fcee20adcc83ac3cf412a8398f193c23393dae04bc09132e5ed7bebc742", kill_on_drop: false }`
[INFO] [stderr]    Compiling libm v0.2.15
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling matrixmultiply v0.3.10
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling rawpointer v0.2.1
[INFO] [stderr]    Compiling virtue v0.0.18
[INFO] [stderr]    Compiling safe_arch v0.7.4
[INFO] [stderr]    Compiling bytecount v0.6.9
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling proc-macro-error-attr2 v2.0.0
[INFO] [stderr]    Compiling unty v0.0.4
[INFO] [stderr]    Compiling crc32fast v1.5.0
[INFO] [stderr]    Compiling indexmap v2.11.4
[INFO] [stderr]    Compiling inventory v0.3.21
[INFO] [stderr]    Compiling seahash v4.1.0
[INFO] [stderr]    Compiling indexmap v1.9.3
[INFO] [stderr]    Compiling papergrid v0.14.0
[INFO] [stderr]    Compiling itertools v0.14.0
[INFO] [stderr]    Compiling wide v0.7.33
[INFO] [stderr]    Compiling bincode_derive v2.0.1
[INFO] [stderr]    Compiling num-integer v0.1.46
[INFO] [stderr]    Compiling approx v0.5.1
[INFO] [stderr]    Compiling num-complex v0.4.6
[INFO] [stderr]    Compiling num-bigint v0.4.6
[INFO] [stderr]    Compiling simba v0.9.1
[INFO] [stderr]    Compiling num-rational v0.4.2
[INFO] [stderr]    Compiling proc-macro-error2 v2.0.1
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling nalgebra-macros v0.3.0
[INFO] [stderr]    Compiling tabled_derive v0.10.0
[INFO] [stderr]    Compiling tabled v0.18.0
[INFO] [stderr]    Compiling bincode v2.0.1
[INFO] [stderr]    Compiling nalgebra v0.34.1
[INFO] [stderr]    Compiling mech-core v0.2.64
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/mech-core-0.2.64/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(get_mut_unchecked)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/mech-core-0.2.64/src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(iter_intersperse)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/mech-core-0.2.64/src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(extract_if)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/mech-core-0.2.64/src/lib.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(step_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/mech-core-0.2.64/src/lib.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![feature(box_patterns)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/mech-core-0.2.64/src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![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-core` (lib) due to 6 previous errors
[INFO] running `Command { std: "docker" "inspect" "063a4fcee20adcc83ac3cf412a8398f193c23393dae04bc09132e5ed7bebc742", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "063a4fcee20adcc83ac3cf412a8398f193c23393dae04bc09132e5ed7bebc742", kill_on_drop: false }`
[INFO] [stdout] 063a4fcee20adcc83ac3cf412a8398f193c23393dae04bc09132e5ed7bebc742