[INFO] updating cached repository KallDrexx/cryptoquip_solver_rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/KallDrexx/cryptoquip_solver_rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/KallDrexx/cryptoquip_solver_rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/KallDrexx/cryptoquip_solver_rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/KallDrexx/cryptoquip_solver_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/KallDrexx/cryptoquip_solver_rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/KallDrexx/cryptoquip_solver_rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/KallDrexx/cryptoquip_solver_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0d93020defd2cd032ca413a3ffbec340ffa53394
[INFO] sha for GitHub repo KallDrexx/cryptoquip_solver_rust: 0d93020defd2cd032ca413a3ffbec340ffa53394
[INFO] validating manifest of KallDrexx/cryptoquip_solver_rust 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 KallDrexx/cryptoquip_solver_rust 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 KallDrexx/cryptoquip_solver_rust
[INFO] finished frobbing KallDrexx/cryptoquip_solver_rust
[INFO] frobbed toml for KallDrexx/cryptoquip_solver_rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/KallDrexx/cryptoquip_solver_rust/Cargo.toml
[INFO] started frobbing KallDrexx/cryptoquip_solver_rust
[INFO] finished frobbing KallDrexx/cryptoquip_solver_rust
[INFO] frobbed toml for KallDrexx/cryptoquip_solver_rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/KallDrexx/cryptoquip_solver_rust/Cargo.toml
[INFO] crate KallDrexx/cryptoquip_solver_rust 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing KallDrexx/cryptoquip_solver_rust against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/KallDrexx/cryptoquip_solver_rust:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] b55d34cabf746d01bf4cc8bf7c9fcd787eb327398fc2070603c9a1e87a48ff7b
[INFO] running `"docker" "start" "-a" "b55d34cabf746d01bf4cc8bf7c9fcd787eb327398fc2070603c9a1e87a48ff7b"`
[INFO] [stderr]    Compiling cryptoquip_solver v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(std_misc,collections)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]  --> src/char_mapping.rs:8:11
[INFO] [stderr]   |
[INFO] [stderr] 8 |     for x in (0..input.len()) {
[INFO] [stderr]   |              ^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `cryptoquip_solver`
[INFO] [stderr]   |
[INFO] [stderr]   = note: consider adding a `main` function to `src/main.rs`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for type `&str` in the current scope
[INFO] [stderr]  --> src/char_mapping.rs:9:26
[INFO] [stderr]   |
[INFO] [stderr] 9 |         let input_char = input.char_at(x);
[INFO] [stderr]   |                                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for type `&str` in the current scope
[INFO] [stderr]   --> src/char_mapping.rs:10:34
[INFO] [stderr]    |
[INFO] [stderr] 10 |         let candidate_char = candidate.char_at(x);
[INFO] [stderr]    |                                        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0599, E0601.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `cryptoquip_solver`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b55d34cabf746d01bf4cc8bf7c9fcd787eb327398fc2070603c9a1e87a48ff7b"`
[INFO] running `"docker" "rm" "-f" "b55d34cabf746d01bf4cc8bf7c9fcd787eb327398fc2070603c9a1e87a48ff7b"`
[INFO] [stdout] b55d34cabf746d01bf4cc8bf7c9fcd787eb327398fc2070603c9a1e87a48ff7b