[INFO] updating cached repository 11Takanori/rust-lisp
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/11Takanori/rust-lisp
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/11Takanori/rust-lisp" "work/ex/clippy-test-run/sources/stable/gh/11Takanori/rust-lisp"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/11Takanori/rust-lisp'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/11Takanori/rust-lisp" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/11Takanori/rust-lisp"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/11Takanori/rust-lisp'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e733cdfbb3ada1261a229fc6bb7a278db825d68f
[INFO] sha for GitHub repo 11Takanori/rust-lisp: e733cdfbb3ada1261a229fc6bb7a278db825d68f
[INFO] validating manifest of 11Takanori/rust-lisp on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of 11Takanori/rust-lisp on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing 11Takanori/rust-lisp
[INFO] finished frobbing 11Takanori/rust-lisp
[INFO] frobbed toml for 11Takanori/rust-lisp written to work/ex/clippy-test-run/sources/stable/gh/11Takanori/rust-lisp/Cargo.toml
[INFO] started frobbing 11Takanori/rust-lisp
[INFO] finished frobbing 11Takanori/rust-lisp
[INFO] frobbed toml for 11Takanori/rust-lisp written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/11Takanori/rust-lisp/Cargo.toml
[INFO] crate 11Takanori/rust-lisp has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting 11Takanori/rust-lisp against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-1/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/11Takanori/rust-lisp:/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=forbid" "-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" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 1979ad41f8ca7ec53505ce14ae6e7054e037d495dabc88b39f6d7adf6f3f1f83
[INFO] running `"docker" "start" "-a" "1979ad41f8ca7ec53505ce14ae6e7054e037d495dabc88b39f6d7adf6f3f1f83"`
[INFO] [stderr]     Checking rust_lisp v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:334:9
[INFO] [stderr]     |
[INFO] [stderr] 334 | /         return match &obj {
[INFO] [stderr] 335 | |             &LObj::Nil | &LObj::Num(_) => Ok(obj.clone()),
[INFO] [stderr] 336 | |             &LObj::Sym(ref name) => {
[INFO] [stderr] 337 | |                 let ret = match self.find_var(&obj, env) {
[INFO] [stderr] ...   |
[INFO] [stderr] 344 | |             _ => Ok(LObj::Nil),
[INFO] [stderr] 345 | |         };
[INFO] [stderr]     | |__________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] help: remove `return` as shown
[INFO] [stderr]     |
[INFO] [stderr] 334 |         match &obj {
[INFO] [stderr] 335 |             &LObj::Nil | &LObj::Num(_) => Ok(obj.clone()),
[INFO] [stderr] 336 |             &LObj::Sym(ref name) => {
[INFO] [stderr] 337 |                 let ret = match self.find_var(&obj, env) {
[INFO] [stderr] 338 |                     Some(bind) => bind,
[INFO] [stderr] 339 |                     _ => return Err(format!("{} has no value", name)),
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:418:9
[INFO] [stderr]     |
[INFO] [stderr] 418 | /         return Ok(match f {
[INFO] [stderr] 419 | |             LObj::Subr(subr) => subr.call(&mut self.arena, &args),
[INFO] [stderr] 420 | |             LObj::Expr(body, env) => {
[INFO] [stderr] 421 | |                 match self.arena.get(&body) {
[INFO] [stderr] ...   |
[INFO] [stderr] 430 | |             _ => return Err("not function".into()),
[INFO] [stderr] 431 | |         });
[INFO] [stderr]     | |___________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] help: remove `return` as shown
[INFO] [stderr]     |
[INFO] [stderr] 418 |         Ok(match f {
[INFO] [stderr] 419 |             LObj::Subr(subr) => subr.call(&mut self.arena, &args),
[INFO] [stderr] 420 |             LObj::Expr(body, env) => {
[INFO] [stderr] 421 |                 match self.arena.get(&body) {
[INFO] [stderr] 422 |                     LObj::Cons(car, cdr) => {
[INFO] [stderr] 423 |                         let args = self.arena.pairlis(car, args);
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:334:9
[INFO] [stderr]     |
[INFO] [stderr] 334 | /         return match &obj {
[INFO] [stderr] 335 | |             &LObj::Nil | &LObj::Num(_) => Ok(obj.clone()),
[INFO] [stderr] 336 | |             &LObj::Sym(ref name) => {
[INFO] [stderr] 337 | |                 let ret = match self.find_var(&obj, env) {
[INFO] [stderr] ...   |
[INFO] [stderr] 344 | |             _ => Ok(LObj::Nil),
[INFO] [stderr] 345 | |         };
[INFO] [stderr]     | |__________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] help: remove `return` as shown
[INFO] [stderr]     |
[INFO] [stderr] 334 |         match &obj {
[INFO] [stderr] 335 |             &LObj::Nil | &LObj::Num(_) => Ok(obj.clone()),
[INFO] [stderr] 336 |             &LObj::Sym(ref name) => {
[INFO] [stderr] 337 |                 let ret = match self.find_var(&obj, env) {
[INFO] [stderr] 338 |                     Some(bind) => bind,
[INFO] [stderr] 339 |                     _ => return Err(format!("{} has no value", name)),
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:418:9
[INFO] [stderr]     |
[INFO] [stderr] 418 | /         return Ok(match f {
[INFO] [stderr] 419 | |             LObj::Subr(subr) => subr.call(&mut self.arena, &args),
[INFO] [stderr] 420 | |             LObj::Expr(body, env) => {
[INFO] [stderr] 421 | |                 match self.arena.get(&body) {
[INFO] [stderr] ...   |
[INFO] [stderr] 430 | |             _ => return Err("not function".into()),
[INFO] [stderr] 431 | |         });
[INFO] [stderr]     | |___________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] help: remove `return` as shown
[INFO] [stderr]     |
[INFO] [stderr] 418 |         Ok(match f {
[INFO] [stderr] 419 |             LObj::Subr(subr) => subr.call(&mut self.arena, &args),
[INFO] [stderr] 420 |             LObj::Expr(body, env) => {
[INFO] [stderr] 421 |                 match self.arena.get(&body) {
[INFO] [stderr] 422 |                     LObj::Cons(car, cdr) => {
[INFO] [stderr] 423 |                         let args = self.arena.pairlis(car, args);
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/main.rs:114:9
[INFO] [stderr]     |
[INFO] [stderr] 114 | /         match self {
[INFO] [stderr] 115 | |             &LObj::Cons(ref x, _) => arena.get(x),
[INFO] [stderr] 116 | |             _ => LObj::Nil,
[INFO] [stderr] 117 | |         }
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 114 |         match *self {
[INFO] [stderr] 115 |             LObj::Cons(ref x, _) => arena.get(x),
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/main.rs:121:9
[INFO] [stderr]     |
[INFO] [stderr] 121 | /         match self {
[INFO] [stderr] 122 | |             &LObj::Cons(_, ref x) => arena.get(x),
[INFO] [stderr] 123 | |             _ => LObj::Nil,
[INFO] [stderr] 124 | |         }
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 121 |         match *self {
[INFO] [stderr] 122 |             LObj::Cons(_, ref x) => arena.get(x),
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to match on a boolean expression
[INFO] [stderr]    --> src/main.rs:155:21
[INFO] [stderr]     |
[INFO] [stderr] 155 | /                     match arena.get(car) == arena.get(&cdar) {
[INFO] [stderr] 156 | |                         true => LObj::t(),
[INFO] [stderr] 157 | |                         _ => LObj::Nil,
[INFO] [stderr] 158 | |                     }
[INFO] [stderr]     | |_____________________^ help: consider using an if/else expression: `if arena.get(car) == arena.get(&cdar) { LObj::t() } else { LObj::Nil }`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::match_bool)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_bool
[INFO] [stderr] 
[INFO] [stderr] warning: single-character string constant used as pattern
[INFO] [stderr]    --> src/main.rs:250:45
[INFO] [stderr]     |
[INFO] [stderr] 250 |             } else if self.next.starts_with(")") {
[INFO] [stderr]     |                                             ^^^ help: try using a char instead: `')'`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::single_char_pattern)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: single-character string constant used as pattern
[INFO] [stderr]    --> src/main.rs:265:41
[INFO] [stderr]     |
[INFO] [stderr] 265 |         } else if self.next.starts_with(")") {
[INFO] [stderr]     |                                         ^^^ help: try using a char instead: `')'`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: single-character string constant used as pattern
[INFO] [stderr]    --> src/main.rs:267:41
[INFO] [stderr]     |
[INFO] [stderr] 267 |         } else if self.next.starts_with("(") {
[INFO] [stderr]     |                                         ^^^ help: try using a char instead: `'('`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: single-character string constant used as pattern
[INFO] [stderr]    --> src/main.rs:270:41
[INFO] [stderr]     |
[INFO] [stderr] 270 |         } else if self.next.starts_with("'") {
[INFO] [stderr]     |                                         ^^^ help: try using a char instead: `'''`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/main.rs:334:16
[INFO] [stderr]     |
[INFO] [stderr] 334 |           return match &obj {
[INFO] [stderr]     |  ________________^
[INFO] [stderr] 335 | |             &LObj::Nil | &LObj::Num(_) => Ok(obj.clone()),
[INFO] [stderr] 336 | |             &LObj::Sym(ref name) => {
[INFO] [stderr] 337 | |                 let ret = match self.find_var(&obj, env) {
[INFO] [stderr] ...   |
[INFO] [stderr] 344 | |             _ => Ok(LObj::Nil),
[INFO] [stderr] 345 | |         };
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 334 |         return match obj {
[INFO] [stderr] 335 |             LObj::Nil | LObj::Num(_) => Ok(obj.clone()),
[INFO] [stderr] 336 |             LObj::Sym(ref name) => {
[INFO] [stderr] 337 |                 let ret = match self.find_var(&obj, env) {
[INFO] [stderr] 338 |                     Some(bind) => bind,
[INFO] [stderr] 339 |                     _ => return Err(format!("{} has no value", name)),
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to match on a boolean expression
[INFO] [stderr]    --> src/main.rs:379:35
[INFO] [stderr]     |
[INFO] [stderr] 379 |                           let ret = match try!(self.eval(car, env.clone())) != LObj::Nil {
[INFO] [stderr]     |  ___________________________________^
[INFO] [stderr] 380 | |                             true => self.arena.get(&cdr).car(&self.arena),
[INFO] [stderr] 381 | |                             _ => self.arena.get(&cdr).cdr(&self.arena).car(&self.arena),
[INFO] [stderr] 382 | |                         };
[INFO] [stderr]     | |_________________________^ help: consider using an if/else expression: `if try!(self.eval(car, env.clone())) != LObj::Nil { self.arena.get(&cdr).car(&self.arena) } else { self.arena.get(&cdr).cdr(&self.arena).car(&self.arena) }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_bool
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/main.rs:114:9
[INFO] [stderr]     |
[INFO] [stderr] 114 | /         match self {
[INFO] [stderr] 115 | |             &LObj::Cons(ref x, _) => arena.get(x),
[INFO] [stderr] 116 | |             _ => LObj::Nil,
[INFO] [stderr] 117 | |         }
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 114 |         match *self {
[INFO] [stderr] 115 |             LObj::Cons(ref x, _) => arena.get(x),
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/main.rs:121:9
[INFO] [stderr]     |
[INFO] [stderr] 121 | /         match self {
[INFO] [stderr] 122 | |             &LObj::Cons(_, ref x) => arena.get(x),
[INFO] [stderr] 123 | |             _ => LObj::Nil,
[INFO] [stderr] 124 | |         }
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 121 |         match *self {
[INFO] [stderr] 122 |             LObj::Cons(_, ref x) => arena.get(x),
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to match on a boolean expression
[INFO] [stderr]    --> src/main.rs:155:21
[INFO] [stderr]     |
[INFO] [stderr] 155 | /                     match arena.get(car) == arena.get(&cdar) {
[INFO] [stderr] 156 | |                         true => LObj::t(),
[INFO] [stderr] 157 | |                         _ => LObj::Nil,
[INFO] [stderr] 158 | |                     }
[INFO] [stderr]     | |_____________________^ help: consider using an if/else expression: `if arena.get(car) == arena.get(&cdar) { LObj::t() } else { LObj::Nil }`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::match_bool)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_bool
[INFO] [stderr] 
[INFO] [stderr] warning: single-character string constant used as pattern
[INFO] [stderr]    --> src/main.rs:250:45
[INFO] [stderr]     |
[INFO] [stderr] 250 |             } else if self.next.starts_with(")") {
[INFO] [stderr]     |                                             ^^^ help: try using a char instead: `')'`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::single_char_pattern)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: single-character string constant used as pattern
[INFO] [stderr]    --> src/main.rs:265:41
[INFO] [stderr]     |
[INFO] [stderr] 265 |         } else if self.next.starts_with(")") {
[INFO] [stderr]     |                                         ^^^ help: try using a char instead: `')'`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: single-character string constant used as pattern
[INFO] [stderr]    --> src/main.rs:267:41
[INFO] [stderr]     |
[INFO] [stderr] 267 |         } else if self.next.starts_with("(") {
[INFO] [stderr]     |                                         ^^^ help: try using a char instead: `'('`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: single-character string constant used as pattern
[INFO] [stderr]    --> src/main.rs:270:41
[INFO] [stderr]     |
[INFO] [stderr] 270 |         } else if self.next.starts_with("'") {
[INFO] [stderr]     |                                         ^^^ help: try using a char instead: `'''`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/main.rs:334:16
[INFO] [stderr]     |
[INFO] [stderr] 334 |           return match &obj {
[INFO] [stderr]     |  ________________^
[INFO] [stderr] 335 | |             &LObj::Nil | &LObj::Num(_) => Ok(obj.clone()),
[INFO] [stderr] 336 | |             &LObj::Sym(ref name) => {
[INFO] [stderr] 337 | |                 let ret = match self.find_var(&obj, env) {
[INFO] [stderr] ...   |
[INFO] [stderr] 344 | |             _ => Ok(LObj::Nil),
[INFO] [stderr] 345 | |         };
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 334 |         return match obj {
[INFO] [stderr] 335 |             LObj::Nil | LObj::Num(_) => Ok(obj.clone()),
[INFO] [stderr] 336 |             LObj::Sym(ref name) => {
[INFO] [stderr] 337 |                 let ret = match self.find_var(&obj, env) {
[INFO] [stderr] 338 |                     Some(bind) => bind,
[INFO] [stderr] 339 |                     _ => return Err(format!("{} has no value", name)),
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to match on a boolean expression
[INFO] [stderr]    --> src/main.rs:379:35
[INFO] [stderr]     |
[INFO] [stderr] 379 |                           let ret = match try!(self.eval(car, env.clone())) != LObj::Nil {
[INFO] [stderr]     |  ___________________________________^
[INFO] [stderr] 380 | |                             true => self.arena.get(&cdr).car(&self.arena),
[INFO] [stderr] 381 | |                             _ => self.arena.get(&cdr).cdr(&self.arena).car(&self.arena),
[INFO] [stderr] 382 | |                         };
[INFO] [stderr]     | |_________________________^ help: consider using an if/else expression: `if try!(self.eval(car, env.clone())) != LObj::Nil { self.arena.get(&cdr).car(&self.arena) } else { self.arena.get(&cdr).cdr(&self.arena).car(&self.arena) }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_bool
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.23s
[INFO] running `"docker" "inspect" "1979ad41f8ca7ec53505ce14ae6e7054e037d495dabc88b39f6d7adf6f3f1f83"`
[INFO] running `"docker" "rm" "-f" "1979ad41f8ca7ec53505ce14ae6e7054e037d495dabc88b39f6d7adf6f3f1f83"`
[INFO] [stdout] 1979ad41f8ca7ec53505ce14ae6e7054e037d495dabc88b39f6d7adf6f3f1f83