[INFO] updating cached repository tawashichan/t_lang_rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/tawashichan/t_lang_rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/tawashichan/t_lang_rs" "work/ex/beta-1.37-6/sources/1.36.0/gh/tawashichan/t_lang_rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/tawashichan/t_lang_rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/tawashichan/t_lang_rs" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/tawashichan/t_lang_rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/tawashichan/t_lang_rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 05d0dba0010e66fecab1cddee0727477b1331710
[INFO] sha for GitHub repo tawashichan/t_lang_rs: 05d0dba0010e66fecab1cddee0727477b1331710
[INFO] validating manifest of tawashichan/t_lang_rs 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 tawashichan/t_lang_rs 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 tawashichan/t_lang_rs
[INFO] finished frobbing tawashichan/t_lang_rs
[INFO] frobbed toml for tawashichan/t_lang_rs written to work/ex/beta-1.37-6/sources/1.36.0/gh/tawashichan/t_lang_rs/Cargo.toml
[INFO] started frobbing tawashichan/t_lang_rs
[INFO] finished frobbing tawashichan/t_lang_rs
[INFO] frobbed toml for tawashichan/t_lang_rs written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/tawashichan/t_lang_rs/Cargo.toml
[INFO] crate tawashichan/t_lang_rs already has a lockfile, it will not be regenerated
[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 tawashichan/t_lang_rs 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-5/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/tawashichan/t_lang_rs:/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] cd406d8e0437b91a2b31cdff8c6eccd862a43a01388ef0b24770062565e52f0c
[INFO] running `"docker" "start" "-a" "cd406d8e0437b91a2b31cdff8c6eccd862a43a01388ef0b24770062565e52f0c"`
[INFO] [stderr]    Compiling t_lang v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(slice_patterns)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(box_patterns)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(box_syntax)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `init_prog`
[INFO] [stderr]  --> src/eval.rs:4:40
[INFO] [stderr]   |
[INFO] [stderr] 4 | use crate::ast::{Typ,Exp,Stmt,Prog,Var,init_prog};
[INFO] [stderr]   |                                        ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::ast::*`
[INFO] [stderr]   --> src/main.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 | use crate::ast::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::ast::Stmt::*`
[INFO] [stderr]   --> src/main.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 | use crate::ast::Stmt::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::ast::Exp::*`
[INFO] [stderr]   --> src/main.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 | use crate::ast::Exp::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::ast::Typ::*`
[INFO] [stderr]   --> src/main.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 | use crate::ast::Typ::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::ast::Var::*`
[INFO] [stderr]   --> src/main.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 | use crate::ast::Var::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::lexer::Token`
[INFO] [stderr]   --> src/main.rs:21:5
[INFO] [stderr]    |
[INFO] [stderr] 21 | use crate::lexer::Token;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `t_lang`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "cd406d8e0437b91a2b31cdff8c6eccd862a43a01388ef0b24770062565e52f0c"`
[INFO] running `"docker" "rm" "-f" "cd406d8e0437b91a2b31cdff8c6eccd862a43a01388ef0b24770062565e52f0c"`
[INFO] [stdout] cd406d8e0437b91a2b31cdff8c6eccd862a43a01388ef0b24770062565e52f0c