[INFO] crate dcap-provider 0.2.0 is already in cache
[INFO] extracting crate dcap-provider 0.2.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/dcap-provider/0.2.0
[INFO] extracting crate dcap-provider 0.2.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/dcap-provider/0.2.0
[INFO] validating manifest of dcap-provider-0.2.0 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 dcap-provider-0.2.0 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 dcap-provider-0.2.0
[INFO] finished frobbing dcap-provider-0.2.0
[INFO] frobbed toml for dcap-provider-0.2.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/dcap-provider/0.2.0/Cargo.toml
[INFO] started frobbing dcap-provider-0.2.0
[INFO] finished frobbing dcap-provider-0.2.0
[INFO] frobbed toml for dcap-provider-0.2.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/dcap-provider/0.2.0/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] [stderr]     Blocking waiting for file lock on package cache
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing dcap-provider-0.2.0 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/dcap-provider/0.2.0:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] d7aa70033bac461ae7d5a1792467d264b58d3b06b33fe87e09cc0b06d4670048
[INFO] running `"docker" "start" "-a" "d7aa70033bac461ae7d5a1792467d264b58d3b06b33fe87e09cc0b06d4670048"`
[INFO] [stderr]    Compiling dcap-ql-sys v0.2.0
[INFO] [stderr]    Compiling fortanix-sgx-abi v0.3.3
[INFO] [stderr]    Compiling sgx-isa v0.3.1
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]    Compiling cookie_store v0.7.0
[INFO] [stderr]    Compiling tokio v0.1.22
[INFO] [stderr]    Compiling sgxs v0.7.1
[INFO] [stderr]    Compiling hyper v0.12.33
[INFO] [stderr]    Compiling enclave-runner v0.2.0
[INFO] [stderr]    Compiling sgxs-loaders v0.2.1
[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/enclave-runner-0.2.0/src/lib.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | #![feature(asm)]
[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 `enclave-runner`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "d7aa70033bac461ae7d5a1792467d264b58d3b06b33fe87e09cc0b06d4670048"`
[INFO] running `"docker" "rm" "-f" "d7aa70033bac461ae7d5a1792467d264b58d3b06b33fe87e09cc0b06d4670048"`
[INFO] [stdout] d7aa70033bac461ae7d5a1792467d264b58d3b06b33fe87e09cc0b06d4670048