[INFO] updating cached repository https://github.com/Zjonn/Rust_2019
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/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] 55718b081b4943f40ac129054024c78b3e6e5b9e
[INFO] testing Zjonn/Rust_2019 against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FZjonn%2FRust_2019" "/workspace/builds/worker-8/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Zjonn/Rust_2019 on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/Zjonn/Rust_2019
[INFO] finished tweaking git repo https://github.com/Zjonn/Rust_2019
[INFO] tweaked toml for git repo https://github.com/Zjonn/Rust_2019 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/Zjonn/Rust_2019 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-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" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 8c730d388b5416c0ac1e849052809af0e41b14c2fb4a24a42947d72c17baefcb
[INFO] running `"docker" "start" "-a" "8c730d388b5416c0ac1e849052809af0e41b14c2fb4a24a42947d72c17baefcb"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling codewars v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `ast`
[INFO] [stderr]    --> src/main.rs:265:16
[INFO] [stderr]     |
[INFO] [stderr] 265 | fn interpreter(ast: Expr) -> String {
[INFO] [stderr]     |                ^^^ help: if this is intentional, prefix it with an underscore: `_ast`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `diff`
[INFO] [stderr]  --> src/main.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn diff(expr: &str) -> String {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parser`
[INFO] [stderr]  --> src/main.rs:9:4
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn parser(expr: &str) -> Expr {
[INFO] [stderr]   |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tokenizer`
[INFO] [stderr]   --> src/main.rs:15:4
[INFO] [stderr]    |
[INFO] [stderr] 15 | fn tokenizer(expr: &str) -> Vec<Token> {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `lexer`
[INFO] [stderr]    --> src/main.rs:102:4
[INFO] [stderr]     |
[INFO] [stderr] 102 | fn lexer(tokens: &[Token]) -> Option<(Box<Expr>, &[Token])> {
[INFO] [stderr]     |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `interpreter`
[INFO] [stderr]    --> src/main.rs:265:4
[INFO] [stderr]     |
[INFO] [stderr] 265 | fn interpreter(ast: Expr) -> String {
[INFO] [stderr]     |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Add`
[INFO] [stderr]    --> src/main.rs:271:5
[INFO] [stderr]     |
[INFO] [stderr] 271 |     Add,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Sub`
[INFO] [stderr]    --> src/main.rs:272:5
[INFO] [stderr]     |
[INFO] [stderr] 272 |     Sub,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Mul`
[INFO] [stderr]    --> src/main.rs:273:5
[INFO] [stderr]     |
[INFO] [stderr] 273 |     Mul,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Div`
[INFO] [stderr]    --> src/main.rs:274:5
[INFO] [stderr]     |
[INFO] [stderr] 274 |     Div,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Pow`
[INFO] [stderr]    --> src/main.rs:275:5
[INFO] [stderr]     |
[INFO] [stderr] 275 |     Pow,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Sin`
[INFO] [stderr]    --> src/main.rs:276:5
[INFO] [stderr]     |
[INFO] [stderr] 276 |     Sin,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Cos`
[INFO] [stderr]    --> src/main.rs:277:5
[INFO] [stderr]     |
[INFO] [stderr] 277 |     Cos,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Tan`
[INFO] [stderr]    --> src/main.rs:278:5
[INFO] [stderr]     |
[INFO] [stderr] 278 |     Tan,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Exp`
[INFO] [stderr]    --> src/main.rs:279:5
[INFO] [stderr]     |
[INFO] [stderr] 279 |     Exp,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Ln`
[INFO] [stderr]    --> src/main.rs:280:5
[INFO] [stderr]     |
[INFO] [stderr] 280 |     Ln,
[INFO] [stderr]     |     ^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Var`
[INFO] [stderr]    --> src/main.rs:281:5
[INFO] [stderr]     |
[INFO] [stderr] 281 |     Var,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Val`
[INFO] [stderr]    --> src/main.rs:282:5
[INFO] [stderr]     |
[INFO] [stderr] 282 |     Val,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `val`
[INFO] [stderr]    --> src/main.rs:286:5
[INFO] [stderr]     |
[INFO] [stderr] 286 |     val: Option<String>,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `op`
[INFO] [stderr]    --> src/main.rs:287:5
[INFO] [stderr]     |
[INFO] [stderr] 287 |     op: Operator,
[INFO] [stderr]     |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `l_expr`
[INFO] [stderr]    --> src/main.rs:288:5
[INFO] [stderr]     |
[INFO] [stderr] 288 |     l_expr: Option<Box<Expr>>,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `r_expr`
[INFO] [stderr]    --> src/main.rs:289:5
[INFO] [stderr]     |
[INFO] [stderr] 289 |     r_expr: Option<Box<Expr>>,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `LP`
[INFO] [stderr]    --> src/main.rs:294:5
[INFO] [stderr]     |
[INFO] [stderr] 294 |     LP,
[INFO] [stderr]     |     ^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `RP`
[INFO] [stderr]    --> src/main.rs:295:5
[INFO] [stderr]     |
[INFO] [stderr] 295 |     RP,
[INFO] [stderr]     |     ^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Add`
[INFO] [stderr]    --> src/main.rs:296:5
[INFO] [stderr]     |
[INFO] [stderr] 296 |     Add,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Sub`
[INFO] [stderr]    --> src/main.rs:297:5
[INFO] [stderr]     |
[INFO] [stderr] 297 |     Sub,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Mul`
[INFO] [stderr]    --> src/main.rs:298:5
[INFO] [stderr]     |
[INFO] [stderr] 298 |     Mul,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Div`
[INFO] [stderr]    --> src/main.rs:299:5
[INFO] [stderr]     |
[INFO] [stderr] 299 |     Div,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Pow`
[INFO] [stderr]    --> src/main.rs:300:5
[INFO] [stderr]     |
[INFO] [stderr] 300 |     Pow,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Sin`
[INFO] [stderr]    --> src/main.rs:301:5
[INFO] [stderr]     |
[INFO] [stderr] 301 |     Sin,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Cos`
[INFO] [stderr]    --> src/main.rs:302:5
[INFO] [stderr]     |
[INFO] [stderr] 302 |     Cos,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Tan`
[INFO] [stderr]    --> src/main.rs:303:5
[INFO] [stderr]     |
[INFO] [stderr] 303 |     Tan,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Exp`
[INFO] [stderr]    --> src/main.rs:304:5
[INFO] [stderr]     |
[INFO] [stderr] 304 |     Exp,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Ln`
[INFO] [stderr]    --> src/main.rs:305:5
[INFO] [stderr]     |
[INFO] [stderr] 305 |     Ln,
[INFO] [stderr]     |     ^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Var`
[INFO] [stderr]    --> src/main.rs:306:5
[INFO] [stderr]     |
[INFO] [stderr] 306 |     Var,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Val`
[INFO] [stderr]    --> src/main.rs:307:5
[INFO] [stderr]     |
[INFO] [stderr] 307 |     Val,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 36 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.54s
[INFO] running `"docker" "inspect" "8c730d388b5416c0ac1e849052809af0e41b14c2fb4a24a42947d72c17baefcb"`
[INFO] running `"docker" "rm" "-f" "8c730d388b5416c0ac1e849052809af0e41b14c2fb4a24a42947d72c17baefcb"`
[INFO] [stdout] 8c730d388b5416c0ac1e849052809af0e41b14c2fb4a24a42947d72c17baefcb
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-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" "+1.44.0" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 89de1a7bcbe420c2b2bb83b2e27aab2548351962fc2945dc6f5b8c97b21cefe7
[INFO] running `"docker" "start" "-a" "89de1a7bcbe420c2b2bb83b2e27aab2548351962fc2945dc6f5b8c97b21cefe7"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling codewars v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `ast`
[INFO] [stderr]    --> src/main.rs:265:16
[INFO] [stderr]     |
[INFO] [stderr] 265 | fn interpreter(ast: Expr) -> String {
[INFO] [stderr]     |                ^^^ help: if this is intentional, prefix it with an underscore: `_ast`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `diff`
[INFO] [stderr]  --> src/main.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn diff(expr: &str) -> String {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parser`
[INFO] [stderr]  --> src/main.rs:9:4
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn parser(expr: &str) -> Expr {
[INFO] [stderr]   |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `lexer`
[INFO] [stderr]    --> src/main.rs:102:4
[INFO] [stderr]     |
[INFO] [stderr] 102 | fn lexer(tokens: &[Token]) -> Option<(Box<Expr>, &[Token])> {
[INFO] [stderr]     |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `interpreter`
[INFO] [stderr]    --> src/main.rs:265:4
[INFO] [stderr]     |
[INFO] [stderr] 265 | fn interpreter(ast: Expr) -> String {
[INFO] [stderr]     |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Add`
[INFO] [stderr]    --> src/main.rs:271:5
[INFO] [stderr]     |
[INFO] [stderr] 271 |     Add,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Sub`
[INFO] [stderr]    --> src/main.rs:272:5
[INFO] [stderr]     |
[INFO] [stderr] 272 |     Sub,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Mul`
[INFO] [stderr]    --> src/main.rs:273:5
[INFO] [stderr]     |
[INFO] [stderr] 273 |     Mul,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Div`
[INFO] [stderr]    --> src/main.rs:274:5
[INFO] [stderr]     |
[INFO] [stderr] 274 |     Div,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Pow`
[INFO] [stderr]    --> src/main.rs:275:5
[INFO] [stderr]     |
[INFO] [stderr] 275 |     Pow,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Sin`
[INFO] [stderr]    --> src/main.rs:276:5
[INFO] [stderr]     |
[INFO] [stderr] 276 |     Sin,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Cos`
[INFO] [stderr]    --> src/main.rs:277:5
[INFO] [stderr]     |
[INFO] [stderr] 277 |     Cos,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Tan`
[INFO] [stderr]    --> src/main.rs:278:5
[INFO] [stderr]     |
[INFO] [stderr] 278 |     Tan,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Exp`
[INFO] [stderr]    --> src/main.rs:279:5
[INFO] [stderr]     |
[INFO] [stderr] 279 |     Exp,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Ln`
[INFO] [stderr]    --> src/main.rs:280:5
[INFO] [stderr]     |
[INFO] [stderr] 280 |     Ln,
[INFO] [stderr]     |     ^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Var`
[INFO] [stderr]    --> src/main.rs:281:5
[INFO] [stderr]     |
[INFO] [stderr] 281 |     Var,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Val`
[INFO] [stderr]    --> src/main.rs:282:5
[INFO] [stderr]     |
[INFO] [stderr] 282 |     Val,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `val`
[INFO] [stderr]    --> src/main.rs:286:5
[INFO] [stderr]     |
[INFO] [stderr] 286 |     val: Option<String>,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `op`
[INFO] [stderr]    --> src/main.rs:287:5
[INFO] [stderr]     |
[INFO] [stderr] 287 |     op: Operator,
[INFO] [stderr]     |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `l_expr`
[INFO] [stderr]    --> src/main.rs:288:5
[INFO] [stderr]     |
[INFO] [stderr] 288 |     l_expr: Option<Box<Expr>>,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `r_expr`
[INFO] [stderr]    --> src/main.rs:289:5
[INFO] [stderr]     |
[INFO] [stderr] 289 |     r_expr: Option<Box<Expr>>,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 21 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.90s
[INFO] running `"docker" "inspect" "89de1a7bcbe420c2b2bb83b2e27aab2548351962fc2945dc6f5b8c97b21cefe7"`
[INFO] running `"docker" "rm" "-f" "89de1a7bcbe420c2b2bb83b2e27aab2548351962fc2945dc6f5b8c97b21cefe7"`
[INFO] [stdout] 89de1a7bcbe420c2b2bb83b2e27aab2548351962fc2945dc6f5b8c97b21cefe7
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-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" "+1.44.0" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 43c2d100b8e02f53152bf8f9a7689d409bf84bcbb656e2be3f21d5599f42dbec
[INFO] running `"docker" "start" "-a" "43c2d100b8e02f53152bf8f9a7689d409bf84bcbb656e2be3f21d5599f42dbec"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: unused variable: `ast`
[INFO] [stderr]    --> src/main.rs:265:16
[INFO] [stderr]     |
[INFO] [stderr] 265 | fn interpreter(ast: Expr) -> String {
[INFO] [stderr]     |                ^^^ help: if this is intentional, prefix it with an underscore: `_ast`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `diff`
[INFO] [stderr]  --> src/main.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn diff(expr: &str) -> String {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parser`
[INFO] [stderr]  --> src/main.rs:9:4
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn parser(expr: &str) -> Expr {
[INFO] [stderr]   |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `lexer`
[INFO] [stderr]    --> src/main.rs:102:4
[INFO] [stderr]     |
[INFO] [stderr] 102 | fn lexer(tokens: &[Token]) -> Option<(Box<Expr>, &[Token])> {
[INFO] [stderr]     |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `interpreter`
[INFO] [stderr]    --> src/main.rs:265:4
[INFO] [stderr]     |
[INFO] [stderr] 265 | fn interpreter(ast: Expr) -> String {
[INFO] [stderr]     |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Add`
[INFO] [stderr]    --> src/main.rs:271:5
[INFO] [stderr]     |
[INFO] [stderr] 271 |     Add,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Sub`
[INFO] [stderr]    --> src/main.rs:272:5
[INFO] [stderr]     |
[INFO] [stderr] 272 |     Sub,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Mul`
[INFO] [stderr]    --> src/main.rs:273:5
[INFO] [stderr]     |
[INFO] [stderr] 273 |     Mul,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Div`
[INFO] [stderr]    --> src/main.rs:274:5
[INFO] [stderr]     |
[INFO] [stderr] 274 |     Div,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Pow`
[INFO] [stderr]    --> src/main.rs:275:5
[INFO] [stderr]     |
[INFO] [stderr] 275 |     Pow,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Sin`
[INFO] [stderr]    --> src/main.rs:276:5
[INFO] [stderr]     |
[INFO] [stderr] 276 |     Sin,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Cos`
[INFO] [stderr]    --> src/main.rs:277:5
[INFO] [stderr]     |
[INFO] [stderr] 277 |     Cos,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Tan`
[INFO] [stderr]    --> src/main.rs:278:5
[INFO] [stderr]     |
[INFO] [stderr] 278 |     Tan,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Exp`
[INFO] [stderr]    --> src/main.rs:279:5
[INFO] [stderr]     |
[INFO] [stderr] 279 |     Exp,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Ln`
[INFO] [stderr]    --> src/main.rs:280:5
[INFO] [stderr]     |
[INFO] [stderr] 280 |     Ln,
[INFO] [stderr]     |     ^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Var`
[INFO] [stderr]    --> src/main.rs:281:5
[INFO] [stderr]     |
[INFO] [stderr] 281 |     Var,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Val`
[INFO] [stderr]    --> src/main.rs:282:5
[INFO] [stderr]     |
[INFO] [stderr] 282 |     Val,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `val`
[INFO] [stderr]    --> src/main.rs:286:5
[INFO] [stderr]     |
[INFO] [stderr] 286 |     val: Option<String>,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `op`
[INFO] [stderr]    --> src/main.rs:287:5
[INFO] [stderr]     |
[INFO] [stderr] 287 |     op: Operator,
[INFO] [stderr]     |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `l_expr`
[INFO] [stderr]    --> src/main.rs:288:5
[INFO] [stderr]     |
[INFO] [stderr] 288 |     l_expr: Option<Box<Expr>>,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `r_expr`
[INFO] [stderr]    --> src/main.rs:289:5
[INFO] [stderr]     |
[INFO] [stderr] 289 |     r_expr: Option<Box<Expr>>,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 21 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/codewars-14f00ad30fe34d25
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test tokenizer_tests::basic ... ok
[INFO] [stdout] test tokenizer_tests::var_val ... ok
[INFO] [stdout] test tokenizer_tests::var_w_parents ... ok
[INFO] [stdout] test tokenizer_tests::parents ... ok
[INFO] [stdout] test tokenizer_tests::funcs ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "43c2d100b8e02f53152bf8f9a7689d409bf84bcbb656e2be3f21d5599f42dbec"`
[INFO] running `"docker" "rm" "-f" "43c2d100b8e02f53152bf8f9a7689d409bf84bcbb656e2be3f21d5599f42dbec"`
[INFO] [stdout] 43c2d100b8e02f53152bf8f9a7689d409bf84bcbb656e2be3f21d5599f42dbec