[INFO] crate kaguya_rs 0.1.5 is already in cache
[INFO] extracting crate kaguya_rs 0.1.5 into work/ex/beta-1.38-1/sources/1.37.0/reg/kaguya_rs/0.1.5
[INFO] extracting crate kaguya_rs 0.1.5 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/kaguya_rs/0.1.5
[INFO] validating manifest of kaguya_rs-0.1.5 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 kaguya_rs-0.1.5 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 kaguya_rs-0.1.5
[INFO] finished frobbing kaguya_rs-0.1.5
[INFO] frobbed toml for kaguya_rs-0.1.5 written to work/ex/beta-1.38-1/sources/1.37.0/reg/kaguya_rs/0.1.5/Cargo.toml
[INFO] started frobbing kaguya_rs-0.1.5
[INFO] finished frobbing kaguya_rs-0.1.5
[INFO] frobbed toml for kaguya_rs-0.1.5 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/kaguya_rs/0.1.5/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing kaguya_rs-0.1.5 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-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/kaguya_rs/0.1.5:/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] ecf26bb64a0c99281b9606487bca791eac2a5b42f3e4f37e699957b3179ed9cb
[INFO] running `"docker" "start" "-a" "ecf26bb64a0c99281b9606487bca791eac2a5b42f3e4f37e699957b3179ed9cb"`
[INFO] [stderr]    Compiling kaguya_rs v0.1.5 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.24s
[INFO] running `"docker" "inspect" "ecf26bb64a0c99281b9606487bca791eac2a5b42f3e4f37e699957b3179ed9cb"`
[INFO] running `"docker" "rm" "-f" "ecf26bb64a0c99281b9606487bca791eac2a5b42f3e4f37e699957b3179ed9cb"`
[INFO] [stdout] ecf26bb64a0c99281b9606487bca791eac2a5b42f3e4f37e699957b3179ed9cb
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/kaguya_rs/0.1.5:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] 993f5f3d48526478e4f7945b7de2dc6eeff197fda49c7d0e23bc6a80d3e22f3b
[INFO] running `"docker" "start" "-a" "993f5f3d48526478e4f7945b7de2dc6eeff197fda49c7d0e23bc6a80d3e22f3b"`
[INFO] [stderr]    Compiling kaguya_rs v0.1.5 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> tests/basic_fn.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | #![feature(trace_macros)]
[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 `kaguya_rs`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "993f5f3d48526478e4f7945b7de2dc6eeff197fda49c7d0e23bc6a80d3e22f3b"`
[INFO] running `"docker" "rm" "-f" "993f5f3d48526478e4f7945b7de2dc6eeff197fda49c7d0e23bc6a80d3e22f3b"`
[INFO] [stdout] 993f5f3d48526478e4f7945b7de2dc6eeff197fda49c7d0e23bc6a80d3e22f3b