[INFO] updating cached repository https://github.com/sliechti/lets-build-a-compiler-rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c3bc0fb9d67e83dd44696add162c475e73dd0214
[INFO] testing sliechti/lets-build-a-compiler-rust against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsliechti%2Flets-build-a-compiler-rust" "work/builds/worker-5/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sliechti/lets-build-a-compiler-rust on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/sliechti/lets-build-a-compiler-rust
[INFO] finished tweaking git repo https://github.com/sliechti/lets-build-a-compiler-rust
[INFO] tweaked toml for git repo https://github.com/sliechti/lets-build-a-compiler-rust written to work/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/sliechti/lets-build-a-compiler-rust already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-5/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 194a9a21ac68bcaebbff23dbc72484f787640d976bc722f09264ce81d03ccadd
[INFO] running `"docker" "start" "-a" "194a9a21ac68bcaebbff23dbc72484f787640d976bc722f09264ce81d03ccadd"`
[INFO] [stderr]    Compiling rustcompiler v0.1.0 (/opt/rustwide/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 0.52s
[INFO] running `"docker" "inspect" "194a9a21ac68bcaebbff23dbc72484f787640d976bc722f09264ce81d03ccadd"`
[INFO] running `"docker" "rm" "-f" "194a9a21ac68bcaebbff23dbc72484f787640d976bc722f09264ce81d03ccadd"`
[INFO] [stdout] 194a9a21ac68bcaebbff23dbc72484f787640d976bc722f09264ce81d03ccadd
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-5/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 281c1bac8ecc4b89ce48bb17858fdeaf3cf10fa084d04c4e209adae2c4a46285
[INFO] running `"docker" "start" "-a" "281c1bac8ecc4b89ce48bb17858fdeaf3cf10fa084d04c4e209adae2c4a46285"`
[INFO] [stderr]    Compiling rustcompiler v0.1.0 (/opt/rustwide/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" "281c1bac8ecc4b89ce48bb17858fdeaf3cf10fa084d04c4e209adae2c4a46285"`
[INFO] running `"docker" "rm" "-f" "281c1bac8ecc4b89ce48bb17858fdeaf3cf10fa084d04c4e209adae2c4a46285"`
[INFO] [stdout] 281c1bac8ecc4b89ce48bb17858fdeaf3cf10fa084d04c4e209adae2c4a46285