[INFO] crate ast_node 0.4.2 is already in cache
[INFO] extracting crate ast_node 0.4.2 into work/ex/beta-1.38-1/sources/1.37.0/reg/ast_node/0.4.2
[INFO] extracting crate ast_node 0.4.2 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/ast_node/0.4.2
[INFO] validating manifest of ast_node-0.4.2 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ast_node-0.4.2 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing ast_node-0.4.2
[INFO] finished frobbing ast_node-0.4.2
[INFO] frobbed toml for ast_node-0.4.2 written to work/ex/beta-1.38-1/sources/1.37.0/reg/ast_node/0.4.2/Cargo.toml
[INFO] started frobbing ast_node-0.4.2
[INFO] finished frobbing ast_node-0.4.2
[INFO] frobbed toml for ast_node-0.4.2 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/ast_node/0.4.2/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing ast_node-0.4.2 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/ast_node/0.4.2:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] d3ef673c79665ba4016f8f8ef4617044b24228c660cbda4dee1e2e17402d095f
[INFO] running `"docker" "start" "-a" "d3ef673c79665ba4016f8f8ef4617044b24228c660cbda4dee1e2e17402d095f"`
[INFO] [stderr]    Compiling darling_core v0.8.6
[INFO] [stderr]    Compiling pmutil v0.3.0
[INFO] [stderr]    Compiling swc_macros_common v0.2.0
[INFO] [stderr]    Compiling darling_macro v0.8.6
[INFO] [stderr]    Compiling darling v0.8.6
[INFO] [stderr]    Compiling ast_node v0.4.2 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/spanned.rs:80:29
[INFO] [stderr]    |
[INFO] [stderr] 80 |     fn simple_field(field: &ToTokens) -> Box<Expr> {
[INFO] [stderr]    |                             ^^^^^^^^ help: use `dyn`: `dyn ToTokens`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 18.95s
[INFO] running `"docker" "inspect" "d3ef673c79665ba4016f8f8ef4617044b24228c660cbda4dee1e2e17402d095f"`
[INFO] running `"docker" "rm" "-f" "d3ef673c79665ba4016f8f8ef4617044b24228c660cbda4dee1e2e17402d095f"`
[INFO] [stdout] d3ef673c79665ba4016f8f8ef4617044b24228c660cbda4dee1e2e17402d095f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/ast_node/0.4.2:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 1a6c3b3705c9d3709f9089c60a18b82a687ae615d1fdb2f20744d35b112f02ec
[INFO] running `"docker" "start" "-a" "1a6c3b3705c9d3709f9089c60a18b82a687ae615d1fdb2f20744d35b112f02ec"`
[INFO] [stderr]    Compiling ast_node v0.4.2
[INFO] [stderr]    Compiling swc_common v0.3.1
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/swc_common-0.3.1/src/lib.rs:1:31
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![cfg_attr(feature = "fold", feature(specialization))]
[INFO] [stderr]   |                               ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `swc_common`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "1a6c3b3705c9d3709f9089c60a18b82a687ae615d1fdb2f20744d35b112f02ec"`
[INFO] running `"docker" "rm" "-f" "1a6c3b3705c9d3709f9089c60a18b82a687ae615d1fdb2f20744d35b112f02ec"`
[INFO] [stdout] 1a6c3b3705c9d3709f9089c60a18b82a687ae615d1fdb2f20744d35b112f02ec