[INFO] updating cached repository sliechti/lets-build-a-compiler-rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/sliechti/lets-build-a-compiler-rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/sliechti/lets-build-a-compiler-rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/sliechti/lets-build-a-compiler-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/sliechti/lets-build-a-compiler-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/sliechti/lets-build-a-compiler-rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sliechti/lets-build-a-compiler-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sliechti/lets-build-a-compiler-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c3bc0fb9d67e83dd44696add162c475e73dd0214
[INFO] sha for GitHub repo sliechti/lets-build-a-compiler-rust: c3bc0fb9d67e83dd44696add162c475e73dd0214
[INFO] validating manifest of sliechti/lets-build-a-compiler-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 sliechti/lets-build-a-compiler-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 sliechti/lets-build-a-compiler-rust
[INFO] finished frobbing sliechti/lets-build-a-compiler-rust
[INFO] frobbed toml for sliechti/lets-build-a-compiler-rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/sliechti/lets-build-a-compiler-rust/Cargo.toml
[INFO] started frobbing sliechti/lets-build-a-compiler-rust
[INFO] finished frobbing sliechti/lets-build-a-compiler-rust
[INFO] frobbed toml for sliechti/lets-build-a-compiler-rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sliechti/lets-build-a-compiler-rust/Cargo.toml
[INFO] crate sliechti/lets-build-a-compiler-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 sliechti/lets-build-a-compiler-rust 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-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/sliechti/lets-build-a-compiler-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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 524d2e4614977ac20f21785fb6e4b8aca9c6af42b14c5efe4cf0c44e79f98b18
[INFO] running `"docker" "start" "-a" "524d2e4614977ac20f21785fb6e4b8aca9c6af42b14c5efe4cf0c44e79f98b18"`
[INFO] [stderr]    Compiling rustcompiler v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]    --> src/interpreter.rs:205:16
[INFO] [stderr]     |
[INFO] [stderr] 205 |             if (self.buff == END_PROG) {
[INFO] [stderr]     |                ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `ret` is never read
[INFO] [stderr]   --> src/interpreter.rs:78:17
[INFO] [stderr]    |
[INFO] [stderr] 78 |         let mut ret: u32 = 0;
[INFO] [stderr]    |                 ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `ret` is never read
[INFO] [stderr]    --> src/interpreter.rs:161:17
[INFO] [stderr]     |
[INFO] [stderr] 161 |         let mut ret: u32 = 0;
[INFO] [stderr]     |                 ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/interpreter.rs:84:17
[INFO] [stderr]    |
[INFO] [stderr] 84 |             let mut var = self.get_name();
[INFO] [stderr]    |                 ----^^^
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.09s
[INFO] running `"docker" "inspect" "524d2e4614977ac20f21785fb6e4b8aca9c6af42b14c5efe4cf0c44e79f98b18"`
[INFO] running `"docker" "rm" "-f" "524d2e4614977ac20f21785fb6e4b8aca9c6af42b14c5efe4cf0c44e79f98b18"`
[INFO] [stdout] 524d2e4614977ac20f21785fb6e4b8aca9c6af42b14c5efe4cf0c44e79f98b18
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/sliechti/lets-build-a-compiler-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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 0e2d97a91b3bb9049b3224e7fd26e40de3f32a8173dd1293e7b09d6ca4e4fbd4
[INFO] running `"docker" "start" "-a" "0e2d97a91b3bb9049b3224e7fd26e40de3f32a8173dd1293e7b09d6ca4e4fbd4"`
[INFO] [stderr]    Compiling rustcompiler v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]    --> src/interpreter.rs:205:16
[INFO] [stderr]     |
[INFO] [stderr] 205 |             if (self.buff == END_PROG) {
[INFO] [stderr]     |                ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0603]: function `is_alpha` is private
[INFO] [stderr]  --> src/unittest.rs:5:30
[INFO] [stderr]   |
[INFO] [stderr] 5 |     assert_eq!(true, cradle::is_alpha('a'));
[INFO] [stderr]   |                              ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0603]: function `is_alpha` is private
[INFO] [stderr]  --> src/unittest.rs:6:30
[INFO] [stderr]   |
[INFO] [stderr] 6 |     assert_eq!(true, cradle::is_alpha('A'));
[INFO] [stderr]   |                              ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0603]: function `is_alpha` is private
[INFO] [stderr]  --> src/unittest.rs:7:30
[INFO] [stderr]   |
[INFO] [stderr] 7 |     assert_eq!(true, cradle::is_alpha('X'));
[INFO] [stderr]   |                              ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0603]: function `is_alpha` is private
[INFO] [stderr]  --> src/unittest.rs:8:31
[INFO] [stderr]   |
[INFO] [stderr] 8 |     assert_eq!(false, cradle::is_alpha('5'));
[INFO] [stderr]   |                               ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0603]: function `is_alpha` is private
[INFO] [stderr]  --> src/unittest.rs:9:31
[INFO] [stderr]   |
[INFO] [stderr] 9 |     assert_eq!(false, cradle::is_alpha('0'));
[INFO] [stderr]   |                               ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `ret` is never read
[INFO] [stderr]   --> src/interpreter.rs:78:17
[INFO] [stderr]    |
[INFO] [stderr] 78 |         let mut ret: u32 = 0;
[INFO] [stderr]    |                 ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `ret` is never read
[INFO] [stderr]    --> src/interpreter.rs:161:17
[INFO] [stderr]     |
[INFO] [stderr] 161 |         let mut ret: u32 = 0;
[INFO] [stderr]     |                 ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/interpreter.rs:84:17
[INFO] [stderr]    |
[INFO] [stderr] 84 |             let mut var = self.get_name();
[INFO] [stderr]    |                 ----^^^
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 5 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0603`.
[INFO] [stderr] error: Could not compile `rustcompiler`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "0e2d97a91b3bb9049b3224e7fd26e40de3f32a8173dd1293e7b09d6ca4e4fbd4"`
[INFO] running `"docker" "rm" "-f" "0e2d97a91b3bb9049b3224e7fd26e40de3f32a8173dd1293e7b09d6ca4e4fbd4"`
[INFO] [stdout] 0e2d97a91b3bb9049b3224e7fd26e40de3f32a8173dd1293e7b09d6ca4e4fbd4