[INFO] crate cortex-m-rt 0.6.9 is already in cache
[INFO] extracting crate cortex-m-rt 0.6.9 into work/ex/beta-1.38-1/sources/1.37.0/reg/cortex-m-rt/0.6.9
[INFO] extracting crate cortex-m-rt 0.6.9 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/cortex-m-rt/0.6.9
[INFO] validating manifest of cortex-m-rt-0.6.9 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 cortex-m-rt-0.6.9 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 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-1.38-1/sources/1.37.0/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-1.38-1/sources/beta-2019-08-13/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" "+1.37.0" "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 cortex-m-rt-0.6.9 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] f3bcb8524da489f87fbda3d09e7231343242138d9d96496b6bae3fc572432f41
[INFO] running `"docker" "start" "-a" "f3bcb8524da489f87fbda3d09e7231343242138d9d96496b6bae3fc572432f41"`
[INFO] [stderr]    Compiling proc-macro2 v0.4.27
[INFO] [stderr]    Compiling rand_core v0.4.0
[INFO] [stderr]    Compiling syn v0.15.29
[INFO] [stderr]    Compiling cortex-m-rt v0.6.9 (/opt/crater/workdir)
[INFO] [stderr]    Compiling r0 v0.2.2
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand v0.5.6
[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 18.98s
[INFO] running `"docker" "inspect" "f3bcb8524da489f87fbda3d09e7231343242138d9d96496b6bae3fc572432f41"`
[INFO] running `"docker" "rm" "-f" "f3bcb8524da489f87fbda3d09e7231343242138d9d96496b6bae3fc572432f41"`
[INFO] [stdout] f3bcb8524da489f87fbda3d09e7231343242138d9d96496b6bae3fc572432f41
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 17bad094520e02c61551e538aea89192dd6d99cc07cebef8e8e7d838b3e1cb78
[INFO] running `"docker" "start" "-a" "17bad094520e02c61551e538aea89192dd6d99cc07cebef8e8e7d838b3e1cb78"`
[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 memchr v2.2.0
[INFO] [stderr]    Compiling serde v1.0.89
[INFO] [stderr]    Compiling rustc-demangle v0.1.13
[INFO] [stderr]    Compiling cfg-if v0.1.7
[INFO] [stderr]    Compiling itoa v0.4.3
[INFO] [stderr]    Compiling ucd-util v0.1.3
[INFO] [stderr]    Compiling stable_deref_trait v1.1.1
[INFO] [stderr]    Compiling regex v1.1.2
[INFO] [stderr]    Compiling cortex-m v0.6.0
[INFO] [stderr]    Compiling vcell v0.1.0
[INFO] [stderr]    Compiling compiletest_rs v0.3.19
[INFO] [stderr]    Compiling utf8-ranges v1.0.2
[INFO] [stderr]    Compiling panic-halt v0.2.0
[INFO] [stderr]    Compiling log v0.4.6
[INFO] [stderr]    Compiling getopts v0.2.18
[INFO] [stderr]    Compiling backtrace v0.3.14
[INFO] [stderr]    Compiling volatile-register v0.2.0
[INFO] [stderr]    Compiling regex-syntax v0.6.5
[INFO] [stderr]    Compiling generic-array v0.12.0
[INFO] [stderr]    Compiling bare-metal v0.2.4
[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 filetime v0.2.4
[INFO] [stderr]    Compiling aho-corasick v0.6.10
[INFO] [stderr]    Compiling aligned v0.3.1
[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 serde_json v1.0.39
[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" "17bad094520e02c61551e538aea89192dd6d99cc07cebef8e8e7d838b3e1cb78"`
[INFO] running `"docker" "rm" "-f" "17bad094520e02c61551e538aea89192dd6d99cc07cebef8e8e7d838b3e1cb78"`
[INFO] [stdout] 17bad094520e02c61551e538aea89192dd6d99cc07cebef8e8e7d838b3e1cb78