[INFO] updating cached repository rightfold/feldspar
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/rightfold/feldspar
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/rightfold/feldspar" "work/ex/beta-1.38-1/sources/1.37.0/gh/rightfold/feldspar"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/rightfold/feldspar'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/rightfold/feldspar" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rightfold/feldspar"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rightfold/feldspar'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 435aac58af0ff8833a6c18fe84fb35fff70315b8
[INFO] sha for GitHub repo rightfold/feldspar: 435aac58af0ff8833a6c18fe84fb35fff70315b8
[INFO] validating manifest of rightfold/feldspar 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 rightfold/feldspar 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 rightfold/feldspar
[INFO] finished frobbing rightfold/feldspar
[INFO] frobbed toml for rightfold/feldspar written to work/ex/beta-1.38-1/sources/1.37.0/gh/rightfold/feldspar/Cargo.toml
[INFO] started frobbing rightfold/feldspar
[INFO] finished frobbing rightfold/feldspar
[INFO] frobbed toml for rightfold/feldspar written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rightfold/feldspar/Cargo.toml
[INFO] crate rightfold/feldspar 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 rightfold/feldspar 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-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/rightfold/feldspar:/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] bcac93c5533ebbb68c8774ab96a969a4f4cc7a9c8f22ae89ae6aa2f1e9b837fe
[INFO] running `"docker" "start" "-a" "bcac93c5533ebbb68c8774ab96a969a4f4cc7a9c8f22ae89ae6aa2f1e9b837fe"`
[INFO] [stderr]    Compiling nom v2.2.1
[INFO] [stderr]    Compiling feldspar v0.0.2 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/value.rs:28:26
[INFO] [stderr]    |
[INFO] [stderr] 28 |   FileHandle(RefCell<Box<io::Write>>),
[INFO] [stderr]    |                          ^^^^^^^^^ help: use `dyn`: `dyn io::Write`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/value.rs:91:52
[INFO] [stderr]    |
[INFO] [stderr] 91 |   pub fn file_handle_write(&self) -> Option<RefMut<io::Write>> {
[INFO] [stderr]    |                                                    ^^^^^^^^^ help: use `dyn`: `dyn io::Write`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/parse.rs:150:9
[INFO] [stderr]     |
[INFO] [stderr] 150 |         a.0.alloc(Let(POS, name, ty, value, acc)));
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&syntax::Expr<'_, '_>`
[INFO] [stderr]                found type `&mut syntax::Expr<'e, 't>`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0308`.
[INFO] [stderr] error: Could not compile `feldspar`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "bcac93c5533ebbb68c8774ab96a969a4f4cc7a9c8f22ae89ae6aa2f1e9b837fe"`
[INFO] running `"docker" "rm" "-f" "bcac93c5533ebbb68c8774ab96a969a4f4cc7a9c8f22ae89ae6aa2f1e9b837fe"`
[INFO] [stdout] bcac93c5533ebbb68c8774ab96a969a4f4cc7a9c8f22ae89ae6aa2f1e9b837fe