[INFO] updating cached repository Faucette/rs-lambda
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Faucette/rs-lambda
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Faucette/rs-lambda" "work/ex/beta-1.38-1/sources/1.37.0/gh/Faucette/rs-lambda"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Faucette/rs-lambda'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Faucette/rs-lambda" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Faucette/rs-lambda"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Faucette/rs-lambda'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f1bd7a563f5b6cae4c7d4b197433c048445736d3
[INFO] sha for GitHub repo Faucette/rs-lambda: f1bd7a563f5b6cae4c7d4b197433c048445736d3
[INFO] validating manifest of Faucette/rs-lambda 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 Faucette/rs-lambda 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 Faucette/rs-lambda
[INFO] finished frobbing Faucette/rs-lambda
[INFO] frobbed toml for Faucette/rs-lambda written to work/ex/beta-1.38-1/sources/1.37.0/gh/Faucette/rs-lambda/Cargo.toml
[INFO] started frobbing Faucette/rs-lambda
[INFO] finished frobbing Faucette/rs-lambda
[INFO] frobbed toml for Faucette/rs-lambda written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Faucette/rs-lambda/Cargo.toml
[INFO] crate Faucette/rs-lambda 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 Faucette/rs-lambda 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-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Faucette/rs-lambda:/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] 8f03991a961237bc5c4d39d7f519dc483ca2d8904288cdbf0c52f117282618de
[INFO] running `"docker" "start" "-a" "8f03991a961237bc5c4d39d7f519dc483ca2d8904288cdbf0c52f117282618de"`
[INFO] [stderr]    Compiling rng v0.1.0 (https://github.com/nathanfaucett/rs-rng#1b0519dd)
[INFO] [stderr]    Compiling collection_traits v0.1.0 (https://github.com/nathanfaucett/rs-collection_traits.git#e29b61b4)
[INFO] [stderr]    Compiling prng v0.1.0 (https://github.com/nathanfaucett/rs-prng#1e4d9022)
[INFO] [stderr] error[E0432]: unresolved import `alloc::arc`
[INFO] [stderr]  --> /opt/crater/cargo-home/git/checkouts/rs-prng-45c50210de0d12df/1e4d902/src/atomic_prng.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | use alloc::arc::Arc;
[INFO] [stderr]   |            ^^^ could not find `arc` in `alloc`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/git/checkouts/rs-prng-45c50210de0d12df/1e4d902/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(alloc)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `prng`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "8f03991a961237bc5c4d39d7f519dc483ca2d8904288cdbf0c52f117282618de"`
[INFO] running `"docker" "rm" "-f" "8f03991a961237bc5c4d39d7f519dc483ca2d8904288cdbf0c52f117282618de"`
[INFO] [stdout] 8f03991a961237bc5c4d39d7f519dc483ca2d8904288cdbf0c52f117282618de