[INFO] crate cex 0.3.0 is already in cache
[INFO] extracting crate cex 0.3.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/cex/0.3.0
[INFO] extracting crate cex 0.3.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/cex/0.3.0
[INFO] validating manifest of cex-0.3.0 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of cex-0.3.0 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing cex-0.3.0
[INFO] finished frobbing cex-0.3.0
[INFO] frobbed toml for cex-0.3.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/cex/0.3.0/Cargo.toml
[INFO] started frobbing cex-0.3.0
[INFO] finished frobbing cex-0.3.0
[INFO] frobbed toml for cex-0.3.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/cex/0.3.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing cex-0.3.0 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/cex/0.3.0:/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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 24c03e03c93170626d45f152383b7596710734cb0ab08303a0ca7803e90d79d7
[INFO] running `"docker" "start" "-a" "24c03e03c93170626d45f152383b7596710734cb0ab08303a0ca7803e90d79d7"`
[INFO] [stderr]    Compiling enumx v0.3.0
[INFO] [stderr]    Compiling cex v0.3.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.33s
[INFO] running `"docker" "inspect" "24c03e03c93170626d45f152383b7596710734cb0ab08303a0ca7803e90d79d7"`
[INFO] running `"docker" "rm" "-f" "24c03e03c93170626d45f152383b7596710734cb0ab08303a0ca7803e90d79d7"`
[INFO] [stdout] 24c03e03c93170626d45f152383b7596710734cb0ab08303a0ca7803e90d79d7
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/cex/0.3.0:/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" "+beta-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] e979f736247cf6795936a88c6678a4cadec70c67549ef2088c1593981f2db1dc
[INFO] running `"docker" "start" "-a" "e979f736247cf6795936a88c6678a4cadec70c67549ef2088c1593981f2db1dc"`
[INFO] [stderr]    Compiling syn v0.15.42
[INFO] [stderr]    Compiling enumx_derive v0.3.0
[INFO] [stderr]    Compiling cex_derive v0.3.0
[INFO] [stderr]    Compiling cex v0.3.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     feature( try_blocks, stmt_expr_attributes, proc_macro_hygiene ))]
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/test/wrapping_errors.rs:34:32
[INFO] [stderr]    |
[INFO] [stderr] 34 |     fn cause(&self) -> Option<&error::Error> {
[INFO] [stderr]    |                                ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[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 `cex`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "e979f736247cf6795936a88c6678a4cadec70c67549ef2088c1593981f2db1dc"`
[INFO] running `"docker" "rm" "-f" "e979f736247cf6795936a88c6678a4cadec70c67549ef2088c1593981f2db1dc"`
[INFO] [stdout] e979f736247cf6795936a88c6678a4cadec70c67549ef2088c1593981f2db1dc