[INFO] crate hashcons 0.1.1 is already in cache
[INFO] testing hashcons-0.1.1 against beta-2019-09-28 for beta-1.39-1
[INFO] extracting crate hashcons 0.1.1 into work/builds/worker-1/source
[INFO] validating manifest of crates.io crate hashcons 0.1.1 on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate hashcons 0.1.1
[INFO] finished tweaking crates.io crate hashcons 0.1.1
[INFO] tweaked toml for crates.io crate hashcons 0.1.1 written to work/builds/worker-1/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-1/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" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] 1d34655b71ff1a9997bcadfc3820c442b61c1c9b384bf7952d6e6fb8d225fc7d
[INFO] running `"docker" "start" "-a" "1d34655b71ff1a9997bcadfc3820c442b61c1c9b384bf7952d6e6fb8d225fc7d"`
[INFO] [stderr]    Compiling serde v1.0.101
[INFO] [stderr]    Compiling serde_json v1.0.41
[INFO] [stderr]    Compiling hashcons v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]    --> src/merkle.rs:180:1
[INFO] [stderr]     |
[INFO] [stderr] 180 | / /// Global table of serialized objects; permits us to avoid multiple
[INFO] [stderr] 181 | | /// serialized copies of a single, shared object.
[INFO] [stderr]     | |_________________________________________________^
[INFO] [stderr] 182 | / thread_local!(static TABLE:
[INFO] [stderr] 183 | |               RefCell<Table> =
[INFO] [stderr] 184 | |               RefCell::new(Table{
[INFO] [stderr] 185 | |                   copy_count:0,
[INFO] [stderr] 186 | |                   table:HashMap::new()
[INFO] [stderr] 187 | |               }));
[INFO] [stderr]     | |__________________- rustdoc does not generate documentation for macro expansions
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr]     = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(rc_downcast)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/merkle.rs:177:29
[INFO] [stderr]     |
[INFO] [stderr] 177 |     table:HashMap<Id,Box<Rc<Any>>>
[INFO] [stderr]     |                             ^^^ help: use `dyn`: `dyn Any`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/merkle.rs:213:29
[INFO] [stderr]     |
[INFO] [stderr] 213 |                 let x : &Rc<Any> = &**brc;
[INFO] [stderr]     |                             ^^^ help: use `dyn`: `dyn Any`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/merkle.rs:214:42
[INFO] [stderr]     |
[INFO] [stderr] 214 |                 let y : Result<Rc<T>, Rc<Any>> = (x.clone()).downcast::<T>();
[INFO] [stderr]     |                                          ^^^ help: use `dyn`: `dyn Any`
[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 `hashcons`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "1d34655b71ff1a9997bcadfc3820c442b61c1c9b384bf7952d6e6fb8d225fc7d"`
[INFO] running `"docker" "rm" "-f" "1d34655b71ff1a9997bcadfc3820c442b61c1c9b384bf7952d6e6fb8d225fc7d"`
[INFO] [stdout] 1d34655b71ff1a9997bcadfc3820c442b61c1c9b384bf7952d6e6fb8d225fc7d