[INFO] updating cached repository lwagner94/mycpu
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/lwagner94/mycpu
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/lwagner94/mycpu" "work/ex/beta-1.38-1/sources/1.37.0/gh/lwagner94/mycpu"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/lwagner94/mycpu'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/lwagner94/mycpu" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/lwagner94/mycpu"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/lwagner94/mycpu'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d057e3d466e95dea6ce0124997f4d08b01ce4cd5
[INFO] sha for GitHub repo lwagner94/mycpu: d057e3d466e95dea6ce0124997f4d08b01ce4cd5
[INFO] validating manifest of lwagner94/mycpu 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 lwagner94/mycpu 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 lwagner94/mycpu
[INFO] finished frobbing lwagner94/mycpu
[INFO] frobbed toml for lwagner94/mycpu written to work/ex/beta-1.38-1/sources/1.37.0/gh/lwagner94/mycpu/Cargo.toml
[INFO] started frobbing lwagner94/mycpu
[INFO] finished frobbing lwagner94/mycpu
[INFO] frobbed toml for lwagner94/mycpu written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/lwagner94/mycpu/Cargo.toml
[INFO] crate lwagner94/mycpu 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 lwagner94/mycpu 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-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/lwagner94/mycpu:/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] db3e836eaffa9759cc5fbede2e47cf05ba9d94410aed57b26e13f12177bd44f7
[INFO] running `"docker" "start" "-a" "db3e836eaffa9759cc5fbede2e47cf05ba9d94410aed57b26e13f12177bd44f7"`
[INFO] [stderr]    Compiling mycpu v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error: failed to run custom build command for `mycpu v0.1.0 (/opt/crater/workdir)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/crater/target/debug/build/mycpu-2c470203404b58ee/build-script-build` (exit code: 2)
[INFO] [stderr] --- stderr
[INFO] [stderr]   File "generate_instructions.py", line 41
[INFO] [stderr]     instr += f"    {name},\n"
[INFO] [stderr]                             ^
[INFO] [stderr] SyntaxError: invalid syntax
[INFO] [stderr] Traceback (most recent call last):
[INFO] [stderr]   File "generate_parser.py", line 2, in <module>
[INFO] [stderr]     import yaml
[INFO] [stderr] ImportError: No module named 'yaml'
[INFO] [stderr] 
[INFO] running `"docker" "inspect" "db3e836eaffa9759cc5fbede2e47cf05ba9d94410aed57b26e13f12177bd44f7"`
[INFO] running `"docker" "rm" "-f" "db3e836eaffa9759cc5fbede2e47cf05ba9d94410aed57b26e13f12177bd44f7"`
[INFO] [stdout] db3e836eaffa9759cc5fbede2e47cf05ba9d94410aed57b26e13f12177bd44f7