[INFO] crate pin-rc 0.1.0 is already in cache
[INFO] extracting crate pin-rc 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/pin-rc/0.1.0
[INFO] extracting crate pin-rc 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/pin-rc/0.1.0
[INFO] validating manifest of pin-rc-0.1.0 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 pin-rc-0.1.0 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 pin-rc-0.1.0
[INFO] finished frobbing pin-rc-0.1.0
[INFO] frobbed toml for pin-rc-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/pin-rc/0.1.0/Cargo.toml
[INFO] started frobbing pin-rc-0.1.0
[INFO] finished frobbing pin-rc-0.1.0
[INFO] frobbed toml for pin-rc-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/pin-rc/0.1.0/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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "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" "+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 pin-rc-0.1.0 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-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/pin-rc/0.1.0:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 859ce03d641ac507a8883a1c24d5619290822a56928d548eb5c356151bc1c81d
[INFO] running `"docker" "start" "-a" "859ce03d641ac507a8883a1c24d5619290822a56928d548eb5c356151bc1c81d"`
[INFO] [stderr]    Compiling pin-rc v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `std::mem::Pin`
[INFO] [stderr]  --> src/pin_rc.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::mem::Pin;
[INFO] [stderr]   |     ^^^^^^^^^^^^^ no `Pin` in `mem`
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `std::mem::Pin`
[INFO] [stderr]  --> src/pin_arc.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::mem::Pin;
[INFO] [stderr]   |     ^^^^^^^^^^^^^ no `Pin` in `mem`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(pin)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 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 `pin-rc`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "859ce03d641ac507a8883a1c24d5619290822a56928d548eb5c356151bc1c81d"`
[INFO] running `"docker" "rm" "-f" "859ce03d641ac507a8883a1c24d5619290822a56928d548eb5c356151bc1c81d"`
[INFO] [stdout] 859ce03d641ac507a8883a1c24d5619290822a56928d548eb5c356151bc1c81d