[INFO] updating cached repository kgtkr/tkr-lang
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/kgtkr/tkr-lang
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/kgtkr/tkr-lang" "work/ex/beta-1.38-1/sources/1.37.0/gh/kgtkr/tkr-lang"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/kgtkr/tkr-lang'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kgtkr/tkr-lang" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kgtkr/tkr-lang"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kgtkr/tkr-lang'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] cc4bcdd512f5164549c4e26f3fdf3c95f1c5d14e
[INFO] sha for GitHub repo kgtkr/tkr-lang: cc4bcdd512f5164549c4e26f3fdf3c95f1c5d14e
[INFO] validating manifest of kgtkr/tkr-lang 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 kgtkr/tkr-lang 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 kgtkr/tkr-lang
[INFO] finished frobbing kgtkr/tkr-lang
[INFO] frobbed toml for kgtkr/tkr-lang written to work/ex/beta-1.38-1/sources/1.37.0/gh/kgtkr/tkr-lang/Cargo.toml
[INFO] started frobbing kgtkr/tkr-lang
[INFO] finished frobbing kgtkr/tkr-lang
[INFO] frobbed toml for kgtkr/tkr-lang written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kgtkr/tkr-lang/Cargo.toml
[INFO] crate kgtkr/tkr-lang 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing kgtkr/tkr-lang 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/kgtkr/tkr-lang:/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] 42c5b0c121b19aa17935fea931da64fa425242366f9d25c36f4d0edde19c3f9c
[INFO] running `"docker" "start" "-a" "42c5b0c121b19aa17935fea931da64fa425242366f9d25c36f4d0edde19c3f9c"`
[INFO] [stderr]    Compiling tkr-lang v0.1.0 (/opt/crater/workdir)
[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(decl_macro)]
[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(box_syntax)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `AnalyzerError`, `AnalyzerResult`
[INFO] [stderr]  --> src/lexer.rs:3:78
[INFO] [stderr]   |
[INFO] [stderr] 3 |     analyzer_func, any_one, eof, expect, fail, token, tokens, val, Analyzer, AnalyzerError,
[INFO] [stderr]   |                                                                              ^^^^^^^^^^^^^
[INFO] [stderr] 4 |     AnalyzerResult, Either,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::stream::Stream`
[INFO] [stderr]  --> src/lexer.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use crate::stream::Stream;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Token`
[INFO] [stderr]  --> src/parser.rs:3:34
[INFO] [stderr]   |
[INFO] [stderr] 3 | use crate::token::{Kind, Symbol, Token};
[INFO] [stderr]   |                                  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]  --> src/parser.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     val(Expr::I32Literal(1))
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unreachable_code)] on by default
[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 `tkr-lang`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "42c5b0c121b19aa17935fea931da64fa425242366f9d25c36f4d0edde19c3f9c"`
[INFO] running `"docker" "rm" "-f" "42c5b0c121b19aa17935fea931da64fa425242366f9d25c36f4d0edde19c3f9c"`
[INFO] [stdout] 42c5b0c121b19aa17935fea931da64fa425242366f9d25c36f4d0edde19c3f9c