[INFO] updating cached repository 2over12/rure
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/2over12/rure
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/2over12/rure" "work/ex/beta-1.37-6/sources/1.36.0/gh/2over12/rure"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/2over12/rure'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/2over12/rure" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/2over12/rure"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/2over12/rure'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7c0864e32d5a87a5d067c8340ba2c9dceb65bc56
[INFO] sha for GitHub repo 2over12/rure: 7c0864e32d5a87a5d067c8340ba2c9dceb65bc56
[INFO] validating manifest of 2over12/rure 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 2over12/rure 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 2over12/rure
[INFO] finished frobbing 2over12/rure
[INFO] frobbed toml for 2over12/rure written to work/ex/beta-1.37-6/sources/1.36.0/gh/2over12/rure/Cargo.toml
[INFO] started frobbing 2over12/rure
[INFO] finished frobbing 2over12/rure
[INFO] frobbed toml for 2over12/rure written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/2over12/rure/Cargo.toml
[INFO] crate 2over12/rure 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 2over12/rure 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-7/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/2over12/rure:/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] 797ca54e631b2f10d56655c474ec6268683317229c273ace0bfea62f70ae8e63
[INFO] running `"docker" "start" "-a" "797ca54e631b2f10d56655c474ec6268683317229c273ace0bfea62f70ae8e63"`
[INFO] [stderr]    Compiling error-chain v0.12.0
[INFO] [stderr]    Compiling rsmt2 v0.10.0
[INFO] [stderr]    Compiling rure 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(rustc_private)]
[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(type_alias_enum_variants)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rustc::session::config::Input`
[INFO] [stderr]  --> src/exec/driver/analysis_passes/smt/mod.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use rustc::session::config::Input;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rsmt2::print::Expr2Smt`
[INFO] [stderr]   --> src/exec/driver/analysis_passes/smt/mod.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 | use rsmt2::print::Expr2Smt;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Rator`
[INFO] [stderr]   --> src/exec/driver/analysis_passes/smt/mod.rs:14:18
[INFO] [stderr]    |
[INFO] [stderr] 14 | use super::sir::{Rator,Expr,SymTy,Name};
[INFO] [stderr]    |                  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::sir::MirVariableProp`
[INFO] [stderr]   --> src/exec/driver/analysis_passes/smt/mod.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 | use super::sir::MirVariableProp;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `analysis_passes::AnalysisHandler`
[INFO] [stderr]  --> src/exec/driver/mod.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use analysis_passes::AnalysisHandler;
[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 `rure`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "797ca54e631b2f10d56655c474ec6268683317229c273ace0bfea62f70ae8e63"`
[INFO] running `"docker" "rm" "-f" "797ca54e631b2f10d56655c474ec6268683317229c273ace0bfea62f70ae8e63"`
[INFO] [stdout] 797ca54e631b2f10d56655c474ec6268683317229c273ace0bfea62f70ae8e63