[INFO] updating cached repository jamestthompson3/wasm_starter
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jamestthompson3/wasm_starter
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jamestthompson3/wasm_starter" "work/ex/beta-1.38-1/sources/1.37.0/gh/jamestthompson3/wasm_starter"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jamestthompson3/wasm_starter'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jamestthompson3/wasm_starter" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jamestthompson3/wasm_starter"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jamestthompson3/wasm_starter'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 63e2ea62c17667d67ad138f0b91a9b49892aa0f5
[INFO] sha for GitHub repo jamestthompson3/wasm_starter: 63e2ea62c17667d67ad138f0b91a9b49892aa0f5
[INFO] validating manifest of jamestthompson3/wasm_starter 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 jamestthompson3/wasm_starter 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 jamestthompson3/wasm_starter
[INFO] finished frobbing jamestthompson3/wasm_starter
[INFO] frobbed toml for jamestthompson3/wasm_starter written to work/ex/beta-1.38-1/sources/1.37.0/gh/jamestthompson3/wasm_starter/Cargo.toml
[INFO] started frobbing jamestthompson3/wasm_starter
[INFO] finished frobbing jamestthompson3/wasm_starter
[INFO] frobbed toml for jamestthompson3/wasm_starter written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jamestthompson3/wasm_starter/Cargo.toml
[INFO] crate jamestthompson3/wasm_starter already has a lockfile, it will not be regenerated
[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 jamestthompson3/wasm_starter against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jamestthompson3/wasm_starter:/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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 288a35d2c3e38fe40203c049d95c924c1a466707cd5bbf16f0984a3e869eb2fb
[INFO] running `"docker" "start" "-a" "288a35d2c3e38fe40203c049d95c924c1a466707cd5bbf16f0984a3e869eb2fb"`
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.13
[INFO] [stderr]    Compiling proc-macro2 v0.4.9
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.9/src/lib.rs:47:34
[INFO] [stderr]    |
[INFO] [stderr] 47 | #![cfg_attr(feature = "nightly", feature(proc_macro_raw_ident, proc_macro_span))]
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'proc_macro_def_site'
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.9/src/unstable.rs:347:27
[INFO] [stderr]     |
[INFO] [stderr] 347 |             Span::Nightly(proc_macro::Span::def_site())
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/54724
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `proc-macro2`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "288a35d2c3e38fe40203c049d95c924c1a466707cd5bbf16f0984a3e869eb2fb"`
[INFO] running `"docker" "rm" "-f" "288a35d2c3e38fe40203c049d95c924c1a466707cd5bbf16f0984a3e869eb2fb"`
[INFO] [stdout] 288a35d2c3e38fe40203c049d95c924c1a466707cd5bbf16f0984a3e869eb2fb