[INFO] crate seax_svm 0.2.8 is already in cache
[INFO] testing seax_svm-0.2.8 against 1.38.0 for beta-1.39-1
[INFO] extracting crate seax_svm 0.2.8 into work/builds/worker-9/source
[INFO] validating manifest of crates.io crate seax_svm 0.2.8 on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate seax_svm 0.2.8
[INFO] finished tweaking crates.io crate seax_svm 0.2.8
[INFO] tweaked toml for crates.io crate seax_svm 0.2.8 written to work/builds/worker-9/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-9/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 007e571f970616511ec8af1f42d0e8fd8050938b4992add03798d1631eca124a
[INFO] running `"docker" "start" "-a" "007e571f970616511ec8af1f42d0e8fd8050938b4992add03798d1631eca124a"`
[INFO] [stderr]    Compiling seax_svm v0.2.8 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | #![feature(box_patterns)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0277]: the size for values of type `Self` cannot be known at compilation time
[INFO] [stderr]   --> src/slist.rs:41:5
[INFO] [stderr]    |
[INFO] [stderr] 41 |     fn pop(self)            -> Option<(T, Self)>;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
[INFO] [stderr]    |
[INFO] [stderr]    = help: within `(T, Self)`, the trait `std::marker::Sized` is not implemented for `Self`
[INFO] [stderr]    = note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
[INFO] [stderr]    = help: consider adding a `where Self: std::marker::Sized` bound
[INFO] [stderr]    = note: required because it appears within the type `(T, Self)`
[INFO] [stderr]    = note: required by `std::option::Option`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0277, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0277`.
[INFO] [stderr] error: Could not compile `seax_svm`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "007e571f970616511ec8af1f42d0e8fd8050938b4992add03798d1631eca124a"`
[INFO] running `"docker" "rm" "-f" "007e571f970616511ec8af1f42d0e8fd8050938b4992add03798d1631eca124a"`
[INFO] [stdout] 007e571f970616511ec8af1f42d0e8fd8050938b4992add03798d1631eca124a