[INFO] fetching crate overloadable 0.3.1...
[INFO] extracting crate overloadable 0.3.1 into work/ex/beta-1.37-6/sources/1.36.0/reg/overloadable/0.3.1
[INFO] extracting crate overloadable 0.3.1 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/overloadable/0.3.1
[INFO] validating manifest of overloadable-0.3.1 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 overloadable-0.3.1 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 overloadable-0.3.1
[INFO] finished frobbing overloadable-0.3.1
[INFO] frobbed toml for overloadable-0.3.1 written to work/ex/beta-1.37-6/sources/1.36.0/reg/overloadable/0.3.1/Cargo.toml
[INFO] started frobbing overloadable-0.3.1
[INFO] finished frobbing overloadable-0.3.1
[INFO] frobbed toml for overloadable-0.3.1 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/overloadable/0.3.1/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 overloadable-0.3.1 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/overloadable/0.3.1:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 188f55889cfb85b9eb93f7482972c0a27aaa217e1882a0d6069a050f19516e08
[INFO] running `"docker" "start" "-a" "188f55889cfb85b9eb93f7482972c0a27aaa217e1882a0d6069a050f19516e08"`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling syn v0.15.42
[INFO] [stderr]    Compiling overloadable v0.3.1 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 16.85s
[INFO] running `"docker" "inspect" "188f55889cfb85b9eb93f7482972c0a27aaa217e1882a0d6069a050f19516e08"`
[INFO] running `"docker" "rm" "-f" "188f55889cfb85b9eb93f7482972c0a27aaa217e1882a0d6069a050f19516e08"`
[INFO] [stdout] 188f55889cfb85b9eb93f7482972c0a27aaa217e1882a0d6069a050f19516e08
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/overloadable/0.3.1:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] be4492874250eb470947db2705698c99c2d6ded942011a25ac94452a0b60e9c5
[INFO] running `"docker" "start" "-a" "be4492874250eb470947db2705698c99c2d6ded942011a25ac94452a0b60e9c5"`
[INFO] [stderr]    Compiling overloadable v0.3.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> tests/default.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(unboxed_closures, fn_traits)]
[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 `overloadable`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "be4492874250eb470947db2705698c99c2d6ded942011a25ac94452a0b60e9c5"`
[INFO] running `"docker" "rm" "-f" "be4492874250eb470947db2705698c99c2d6ded942011a25ac94452a0b60e9c5"`
[INFO] [stdout] be4492874250eb470947db2705698c99c2d6ded942011a25ac94452a0b60e9c5