[INFO] crate dynasm 0.3.2 is already in cache
[INFO] extracting crate dynasm 0.3.2 into work/ex/beta-1.37-6/sources/1.36.0/reg/dynasm/0.3.2
[INFO] extracting crate dynasm 0.3.2 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/dynasm/0.3.2
[INFO] validating manifest of dynasm-0.3.2 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of dynasm-0.3.2 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing dynasm-0.3.2
[INFO] finished frobbing dynasm-0.3.2
[INFO] frobbed toml for dynasm-0.3.2 written to work/ex/beta-1.37-6/sources/1.36.0/reg/dynasm/0.3.2/Cargo.toml
[INFO] started frobbing dynasm-0.3.2
[INFO] finished frobbing dynasm-0.3.2
[INFO] frobbed toml for dynasm-0.3.2 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/dynasm/0.3.2/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing dynasm-0.3.2 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/dynasm/0.3.2:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 8bedfe5f6a0f30b944f1a82fcf429d4fc0ce996b709356e50c6ccca49b160b41
[INFO] running `"docker" "start" "-a" "8bedfe5f6a0f30b944f1a82fcf429d4fc0ce996b709356e50c6ccca49b160b41"`
[INFO] [stderr]    Compiling syn v0.15.42
[INFO] [stderr]    Compiling dynasm v0.3.2 (/opt/crater/workdir)
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]    --> src/arch/x64/parser.rs:408:1
[INFO] [stderr]     |
[INFO] [stderr] 408 |   /// why
[INFO] [stderr]     |   ^^^^^^^
[INFO] [stderr] 409 | / lazy_static!{
[INFO] [stderr] 410 | |     static ref X64_REGISTERS: HashMap<&'static str, (RegId, Size)> = {
[INFO] [stderr] 411 | |         use self::RegId::*;
[INFO] [stderr] 412 | |         use serialize::Size::*;
[INFO] [stderr] ...   |
[INFO] [stderr] 758 | |     };
[INFO] [stderr] 759 | | }
[INFO] [stderr]     | |_- rustdoc does not generate documentation for macro expansions
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_doc_comments)] on by default
[INFO] [stderr]     = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(proc_macro_diagnostic)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(proc_macro_span)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `dynasm`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "8bedfe5f6a0f30b944f1a82fcf429d4fc0ce996b709356e50c6ccca49b160b41"`
[INFO] running `"docker" "rm" "-f" "8bedfe5f6a0f30b944f1a82fcf429d4fc0ce996b709356e50c6ccca49b160b41"`
[INFO] [stdout] 8bedfe5f6a0f30b944f1a82fcf429d4fc0ce996b709356e50c6ccca49b160b41