[INFO] updating cached repository Schaeff/zokrates_web_prover
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Schaeff/zokrates_web_prover
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Schaeff/zokrates_web_prover" "work/ex/beta-1.38-1/sources/1.37.0/gh/Schaeff/zokrates_web_prover"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Schaeff/zokrates_web_prover'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Schaeff/zokrates_web_prover" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Schaeff/zokrates_web_prover"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Schaeff/zokrates_web_prover'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 243f9539b88e414dd7421210578a71f13b7133db
[INFO] sha for GitHub repo Schaeff/zokrates_web_prover: 243f9539b88e414dd7421210578a71f13b7133db
[INFO] validating manifest of Schaeff/zokrates_web_prover 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 Schaeff/zokrates_web_prover 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 Schaeff/zokrates_web_prover
[INFO] finished frobbing Schaeff/zokrates_web_prover
[INFO] frobbed toml for Schaeff/zokrates_web_prover written to work/ex/beta-1.38-1/sources/1.37.0/gh/Schaeff/zokrates_web_prover/Cargo.toml
[INFO] started frobbing Schaeff/zokrates_web_prover
[INFO] finished frobbing Schaeff/zokrates_web_prover
[INFO] frobbed toml for Schaeff/zokrates_web_prover written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Schaeff/zokrates_web_prover/Cargo.toml
[INFO] crate Schaeff/zokrates_web_prover 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 Schaeff/zokrates_web_prover 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/Schaeff/zokrates_web_prover:/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] f3742a3f4a0d2697c3947b06a85453d8f53044891316fd948ca8dc9c50fcf344
[INFO] running `"docker" "start" "-a" "f3742a3f4a0d2697c3947b06a85453d8f53044891316fd948ca8dc9c50fcf344"`
[INFO] [stderr]    Compiling syn v0.15.39
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.46
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]    Compiling wasm-bindgen v0.2.46
[INFO] [stderr]    Compiling sourcefile v0.1.4
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling zokrates_core v0.3.12 (https://github.com/ZoKrates/ZoKrates/?branch=wasm-prover#50942ecf)
[INFO] [stderr]    Compiling reduce v0.1.2
[INFO] [stderr]    Compiling rustc-hex v1.0.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.30
[INFO] [stderr]    Compiling from-pest v0.3.1
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling serde_bytes v0.10.5
[INFO] [stderr]    Compiling parity-wasm v0.31.3
[INFO] [stderr]    Compiling parity-wasm v0.35.7
[INFO] [stderr]    Compiling blake2-rfc_bellman_edition v0.0.1
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling num-traits v0.1.43
[INFO] [stderr]    Compiling num-bigint v0.1.44
[INFO] [stderr]    Compiling bincode v0.8.0
[INFO] [stderr]    Compiling tiny-keccak v1.5.0
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling csv-core v0.1.6
[INFO] [stderr]    Compiling bstr v0.2.1
[INFO] [stderr]    Compiling aho-corasick v0.6.10
[INFO] [stderr]    Compiling wasmi-validation v0.1.0
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]    Compiling weedle v0.9.0
[INFO] [stderr]    Compiling backtrace v0.3.32
[INFO] [stderr]    Compiling wasmi v0.4.5
[INFO] [stderr]    Compiling csv v1.1.0
[INFO] [stderr]    Compiling synstructure v0.10.2
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.46
[INFO] [stderr]    Compiling pest_generator v2.1.0
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.46
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling serde_derive v1.0.94
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.46
[INFO] [stderr]    Compiling zokrates_parser v0.1.1 (https://github.com/ZoKrates/ZoKrates/?branch=wasm-prover#50942ecf)
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]    Compiling wasm-bindgen-webidl v0.2.46
[INFO] [stderr]    Compiling single v1.0.0
[INFO] [stderr]    Compiling pest-ast v0.3.3
[INFO] [stderr]    Compiling js-sys v0.3.23
[INFO] [stderr]    Compiling console_error_panic_hook v0.1.6
[INFO] [stderr]    Compiling web-sys v0.3.23
[INFO] [stderr]    Compiling ff_derive_ce v0.4.0
[INFO] [stderr]    Compiling ff_ce v0.6.0
[INFO] [stderr]    Compiling pairing_ce v0.17.0
[INFO] [stderr]    Compiling zokrates_field v0.3.3 (https://github.com/ZoKrates/ZoKrates/?branch=wasm-prover#50942ecf)
[INFO] [stderr]    Compiling bellman_ce v0.3.0
[INFO] [stderr]    Compiling zokrates_pest_ast v0.1.1 (https://github.com/ZoKrates/ZoKrates/?branch=wasm-prover#50942ecf)
[INFO] [stderr]    Compiling sapling-crypto_ce v0.0.5
[INFO] [stderr]    Compiling zokrates_embed v0.1.0 (https://github.com/ZoKrates/ZoKrates/?branch=wasm-prover#50942ecf)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/git/checkouts/zokrates-bc4b6b685c9dd735/50942ec/zokrates_core/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(box_patterns, box_syntax)]
[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 `zokrates_core`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f3742a3f4a0d2697c3947b06a85453d8f53044891316fd948ca8dc9c50fcf344"`
[INFO] running `"docker" "rm" "-f" "f3742a3f4a0d2697c3947b06a85453d8f53044891316fd948ca8dc9c50fcf344"`
[INFO] [stdout] f3742a3f4a0d2697c3947b06a85453d8f53044891316fd948ca8dc9c50fcf344