[INFO] crate relm-gen-widget 0.16.0 is already in cache
[INFO] extracting crate relm-gen-widget 0.16.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/relm-gen-widget/0.16.0
[INFO] extracting crate relm-gen-widget 0.16.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/relm-gen-widget/0.16.0
[INFO] validating manifest of relm-gen-widget-0.16.0 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 relm-gen-widget-0.16.0 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 relm-gen-widget-0.16.0
[INFO] finished frobbing relm-gen-widget-0.16.0
[INFO] frobbed toml for relm-gen-widget-0.16.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/relm-gen-widget/0.16.0/Cargo.toml
[INFO] started frobbing relm-gen-widget-0.16.0
[INFO] finished frobbing relm-gen-widget-0.16.0
[INFO] frobbed toml for relm-gen-widget-0.16.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/relm-gen-widget/0.16.0/Cargo.toml
[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] 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 relm-gen-widget-0.16.0 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/reg/relm-gen-widget/0.16.0:/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] 6cb23b2c575f7e476eaa1d2b63f29e375a7b945f21eb44accf54e5015ba4831a
[INFO] running `"docker" "start" "-a" "6cb23b2c575f7e476eaa1d2b63f29e375a7b945f21eb44accf54e5015ba4831a"`
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling relm-gen-widget v0.16.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/gen.rs:659:17
[INFO] [stderr]     |
[INFO] [stderr] 659 |             let mut original_type = typ.clone();
[INFO] [stderr]     |                 ----^^^^^^^^^^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 40.58s
[INFO] running `"docker" "inspect" "6cb23b2c575f7e476eaa1d2b63f29e375a7b945f21eb44accf54e5015ba4831a"`
[INFO] running `"docker" "rm" "-f" "6cb23b2c575f7e476eaa1d2b63f29e375a7b945f21eb44accf54e5015ba4831a"`
[INFO] [stdout] 6cb23b2c575f7e476eaa1d2b63f29e375a7b945f21eb44accf54e5015ba4831a
[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/reg/relm-gen-widget/0.16.0:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] 1366dd43ed1679eadb134e3949888e435f401ae53f8c2bbbe32ab7dee0fe395e
[INFO] running `"docker" "start" "-a" "1366dd43ed1679eadb134e3949888e435f401ae53f8c2bbbe32ab7dee0fe395e"`
[INFO] [stderr]    Compiling relm-gen-widget v0.16.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `syn::parse_expr`
[INFO] [stderr]    --> src/lib.rs:660:9
[INFO] [stderr]     |
[INFO] [stderr] 660 |     use syn::parse_expr;
[INFO] [stderr]     |         ^^^^^----------
[INFO] [stderr]     |         |    |
[INFO] [stderr]     |         |    help: a similar name exists in the module: `parse_str`
[INFO] [stderr]     |         no `parse_expr` in the root
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `syn::ExprKind`
[INFO] [stderr]    --> src/lib.rs:661:15
[INFO] [stderr]     |
[INFO] [stderr] 661 |     use syn::{ExprKind};
[INFO] [stderr]     |               ^^^^^^^^ no `ExprKind` in the root
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `relm-gen-widget`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "1366dd43ed1679eadb134e3949888e435f401ae53f8c2bbbe32ab7dee0fe395e"`
[INFO] running `"docker" "rm" "-f" "1366dd43ed1679eadb134e3949888e435f401ae53f8c2bbbe32ab7dee0fe395e"`
[INFO] [stdout] 1366dd43ed1679eadb134e3949888e435f401ae53f8c2bbbe32ab7dee0fe395e