[INFO] updating cached repository undo-lang/vm
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/undo-lang/vm
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/undo-lang/vm" "work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/undo-lang/vm"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/undo-lang/vm'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/undo-lang/vm" "work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/undo-lang/vm"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/undo-lang/vm'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 31c0a28a0a6c837d2eb2a331fa998ab40ff49272
[INFO] sha for GitHub repo undo-lang/vm: 31c0a28a0a6c837d2eb2a331fa998ab40ff49272
[INFO] validating manifest of undo-lang/vm on toolchain master#60960a260f7b5c695fd0717311d72ce62dd4eb43
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of undo-lang/vm on toolchain try#266783e4e09e4e9d5307c1c8e695659c58bbcac7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing undo-lang/vm
[INFO] finished frobbing undo-lang/vm
[INFO] frobbed toml for undo-lang/vm written to work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/undo-lang/vm/Cargo.toml
[INFO] started frobbing undo-lang/vm
[INFO] finished frobbing undo-lang/vm
[INFO] frobbed toml for undo-lang/vm written to work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/undo-lang/vm/Cargo.toml
[INFO] crate undo-lang/vm already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking undo-lang/vm against try#266783e4e09e4e9d5307c1c8e695659c58bbcac7 for pr-63376
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63376/worker-3/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/undo-lang/vm:/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=forbid" "-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" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] c2e2b957650aef57336757a3718f139eea8b7277633b3428ea631279cff89f1a
[INFO] running `"docker" "start" "-a" "c2e2b957650aef57336757a3718f139eea8b7277633b3428ea631279cff89f1a"`
[INFO] [stderr]     Checking serde v1.0.15
[INFO] [stderr]     Checking serde_json v1.0.3
[INFO] [stderr]     Checking undo-vm v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error: cannot find derive macro `Serialize` in this scope
[INFO] [stderr]  --> src/vm.rs:6:10
[INFO] [stderr]   |
[INFO] [stderr] 6 | #[derive(Serialize, Deserialize)]
[INFO] [stderr]   |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: cannot find derive macro `Deserialize` in this scope
[INFO] [stderr]  --> src/vm.rs:6:21
[INFO] [stderr]   |
[INFO] [stderr] 6 | #[derive(Serialize, Deserialize)]
[INFO] [stderr]   |                     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0392]: parameter `'a` is never used
[INFO] [stderr]   --> src/vm.rs:11:11
[INFO] [stderr]    |
[INFO] [stderr] 11 | struct VM<'a> {
[INFO] [stderr]    |           ^^ unused parameter
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider removing `'a` or using a marker such as `std::marker::PhantomData`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0392`.
[INFO] [stderr] error: Could not compile `undo-vm`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: cannot find derive macro `Serialize` in this scope
[INFO] [stderr]  --> src/vm.rs:6:10
[INFO] [stderr]   |
[INFO] [stderr] 6 | #[derive(Serialize, Deserialize)]
[INFO] [stderr]   |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: cannot find derive macro `Deserialize` in this scope
[INFO] [stderr]  --> src/vm.rs:6:21
[INFO] [stderr]   |
[INFO] [stderr] 6 | #[derive(Serialize, Deserialize)]
[INFO] [stderr]   |                     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0392]: parameter `'a` is never used
[INFO] [stderr]   --> src/vm.rs:11:11
[INFO] [stderr]    |
[INFO] [stderr] 11 | struct VM<'a> {
[INFO] [stderr]    |           ^^ unused parameter
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider removing `'a` or using a marker such as `std::marker::PhantomData`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0392`.
[INFO] [stderr] error: Could not compile `undo-vm`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "c2e2b957650aef57336757a3718f139eea8b7277633b3428ea631279cff89f1a"`
[INFO] running `"docker" "rm" "-f" "c2e2b957650aef57336757a3718f139eea8b7277633b3428ea631279cff89f1a"`
[INFO] [stdout] c2e2b957650aef57336757a3718f139eea8b7277633b3428ea631279cff89f1a