[INFO] updating cached repository cre-chan/MCIR
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/cre-chan/MCIR
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/cre-chan/MCIR" "work/ex/beta-1.38-1/sources/1.37.0/gh/cre-chan/MCIR"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/cre-chan/MCIR'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/cre-chan/MCIR" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cre-chan/MCIR"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cre-chan/MCIR'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6fad22678369753dbfcb2775396faeee3f94bdb7
[INFO] sha for GitHub repo cre-chan/MCIR: 6fad22678369753dbfcb2775396faeee3f94bdb7
[INFO] validating manifest of cre-chan/MCIR 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 cre-chan/MCIR 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 cre-chan/MCIR
[INFO] finished frobbing cre-chan/MCIR
[INFO] frobbed toml for cre-chan/MCIR written to work/ex/beta-1.38-1/sources/1.37.0/gh/cre-chan/MCIR/Cargo.toml
[INFO] started frobbing cre-chan/MCIR
[INFO] finished frobbing cre-chan/MCIR
[INFO] frobbed toml for cre-chan/MCIR written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cre-chan/MCIR/Cargo.toml
[INFO] crate cre-chan/MCIR 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 cre-chan/MCIR 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/cre-chan/MCIR:/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] e439bb3d1f59efa19516e9bebbff94e1622cd0ab8e5c3a5bccfa369261b385ea
[INFO] running `"docker" "start" "-a" "e439bb3d1f59efa19516e9bebbff94e1622cd0ab8e5c3a5bccfa369261b385ea"`
[INFO] [stderr]    Compiling syn v0.15.37
[INFO] [stderr]    Compiling pest_generator v2.1.0
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]    Compiling MCIR v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error: expected outer doc comment
[INFO] [stderr]   --> src/frontend/parser/AST.rs:18:1
[INFO] [stderr]    |
[INFO] [stderr] 18 | //! syntactical structure for the left values.
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: inner doc comments like this (starting with `//!` or `/*!`) can only appear before items
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `MCIR`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "e439bb3d1f59efa19516e9bebbff94e1622cd0ab8e5c3a5bccfa369261b385ea"`
[INFO] running `"docker" "rm" "-f" "e439bb3d1f59efa19516e9bebbff94e1622cd0ab8e5c3a5bccfa369261b385ea"`
[INFO] [stdout] e439bb3d1f59efa19516e9bebbff94e1622cd0ab8e5c3a5bccfa369261b385ea