[INFO] fetching crate cortex-m-rt 0.6.9...
[INFO] extracting crate cortex-m-rt 0.6.9 into work/ex/beta-1.37-6/sources/1.36.0/reg/cortex-m-rt/0.6.9
[INFO] extracting crate cortex-m-rt 0.6.9 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/cortex-m-rt/0.6.9
[INFO] validating manifest of cortex-m-rt-0.6.9 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 cortex-m-rt-0.6.9 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 cortex-m-rt-0.6.9
[INFO] removed 1 missing examples
[INFO] finished frobbing cortex-m-rt-0.6.9
[INFO] frobbed toml for cortex-m-rt-0.6.9 written to work/ex/beta-1.37-6/sources/1.36.0/reg/cortex-m-rt/0.6.9/Cargo.toml
[INFO] started frobbing cortex-m-rt-0.6.9
[INFO] removed 1 missing examples
[INFO] finished frobbing cortex-m-rt-0.6.9
[INFO] frobbed toml for cortex-m-rt-0.6.9 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/cortex-m-rt/0.6.9/Cargo.toml
[INFO] crate cortex-m-rt-0.6.9 already has a lockfile, it will not be regenerated
[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 cortex-m-rt-0.6.9 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-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/cortex-m-rt/0.6.9:/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] c53ce6b2d17732659e3e116cf30ad14a3305921c93e0a414965ca600309301e5
[INFO] running `"docker" "start" "-a" "c53ce6b2d17732659e3e116cf30ad14a3305921c93e0a414965ca600309301e5"`
[INFO] [stderr]    Compiling syn v0.15.29
[INFO] [stderr]    Compiling cortex-m-rt v0.6.9 (/opt/crater/workdir)
[INFO] [stderr]    Compiling quote v0.6.11
[INFO] [stderr]    Compiling cortex-m-rt-macros v0.1.5
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 15.74s
[INFO] running `"docker" "inspect" "c53ce6b2d17732659e3e116cf30ad14a3305921c93e0a414965ca600309301e5"`
[INFO] running `"docker" "rm" "-f" "c53ce6b2d17732659e3e116cf30ad14a3305921c93e0a414965ca600309301e5"`
[INFO] [stdout] c53ce6b2d17732659e3e116cf30ad14a3305921c93e0a414965ca600309301e5
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/cortex-m-rt/0.6.9:/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] 14142ee2cd14bab3317ca9f44da8266714a13591888da94c295d8d7a3cd67224
[INFO] running `"docker" "start" "-a" "14142ee2cd14bab3317ca9f44da8266714a13591888da94c295d8d7a3cd67224"`
[INFO] [stderr]    Compiling cc v1.0.31
[INFO] [stderr]    Compiling libc v0.2.50
[INFO] [stderr]    Compiling autocfg v0.1.2
[INFO] [stderr]    Compiling ryu v0.2.7
[INFO] [stderr]    Compiling cfg-if v0.1.7
[INFO] [stderr]    Compiling rustc-demangle v0.1.13
[INFO] [stderr]    Compiling itoa v0.4.3
[INFO] [stderr]    Compiling compiletest_rs v0.3.19
[INFO] [stderr]    Compiling regex-syntax v0.6.5
[INFO] [stderr]    Compiling log v0.4.6
[INFO] [stderr]    Compiling getopts v0.2.18
[INFO] [stderr]    Compiling as-slice v0.1.0
[INFO] [stderr]    Compiling synstructure v0.10.1
[INFO] [stderr]    Compiling serde_derive v1.0.89
[INFO] [stderr]    Compiling backtrace v0.3.14
[INFO] [stderr]    Compiling serde_json v1.0.39
[INFO] [stderr]    Compiling aligned v0.3.1
[INFO] [stderr]    Compiling cortex-m v0.6.0
[INFO] [stderr]    Compiling filetime v0.2.4
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]    Compiling regex v1.1.2
[INFO] [stderr]    Compiling rustfix v0.4.4
[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/compiletest_rs-0.3.19/src/lib.rs:13:39
[INFO] [stderr]    |
[INFO] [stderr] 13 | #![cfg_attr(not(feature = "norustc"), feature(rustc_private))]
[INFO] [stderr]    |                                       ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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/compiletest_rs-0.3.19/src/lib.rs:14:38
[INFO] [stderr]    |
[INFO] [stderr] 14 | #![cfg_attr(not(feature = "stable"), feature(test))]
[INFO] [stderr]    |                                      ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `compiletest_rs`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "14142ee2cd14bab3317ca9f44da8266714a13591888da94c295d8d7a3cd67224"`
[INFO] running `"docker" "rm" "-f" "14142ee2cd14bab3317ca9f44da8266714a13591888da94c295d8d7a3cd67224"`
[INFO] [stdout] 14142ee2cd14bab3317ca9f44da8266714a13591888da94c295d8d7a3cd67224