[INFO] updating cached repository tcr/parser-c
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/tcr/parser-c
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/tcr/parser-c" "work/ex/beta-1.38-1/sources/1.37.0/gh/tcr/parser-c"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/tcr/parser-c'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/tcr/parser-c" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/tcr/parser-c"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/tcr/parser-c'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1c51c38ffcfda358b9edfd944a4bac7de1ebcf1a
[INFO] sha for GitHub repo tcr/parser-c: 1c51c38ffcfda358b9edfd944a4bac7de1ebcf1a
[INFO] validating manifest of tcr/parser-c 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 tcr/parser-c 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 tcr/parser-c
[INFO] removed workspace from tcr/parser-c
[INFO] removed path dependency parser-c-macro from tcr/parser-c
[INFO] finished frobbing tcr/parser-c
[INFO] frobbed toml for tcr/parser-c written to work/ex/beta-1.38-1/sources/1.37.0/gh/tcr/parser-c/Cargo.toml
[INFO] started frobbing tcr/parser-c
[INFO] removed workspace from tcr/parser-c
[INFO] removed path dependency parser-c-macro from tcr/parser-c
[INFO] finished frobbing tcr/parser-c
[INFO] frobbed toml for tcr/parser-c written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/tcr/parser-c/Cargo.toml
[INFO] crate tcr/parser-c 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] [stderr]     Updating crates.io index
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/tcr/parser-c/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[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 tcr/parser-c 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/gh/tcr/parser-c:/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] 3daa7f20cc107595fb86f258db77ca7ecf2301d75cc35b6b132d41c98db29549
[INFO] running `"docker" "start" "-a" "3daa7f20cc107595fb86f258db77ca7ecf2301d75cc35b6b132d41c98db29549"`
[INFO] [stderr]    Compiling syn v0.10.8
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling parser-c-macro v0.3.0
[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/parser-c-macro-0.3.0/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(proc_macro)]
[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 `parser-c-macro`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "3daa7f20cc107595fb86f258db77ca7ecf2301d75cc35b6b132d41c98db29549"`
[INFO] running `"docker" "rm" "-f" "3daa7f20cc107595fb86f258db77ca7ecf2301d75cc35b6b132d41c98db29549"`
[INFO] [stdout] 3daa7f20cc107595fb86f258db77ca7ecf2301d75cc35b6b132d41c98db29549