[INFO] updating cached repository kenpratt/rusty_scheme
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/kenpratt/rusty_scheme
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/kenpratt/rusty_scheme" "work/ex/clippy-test-run/sources/stable/gh/kenpratt/rusty_scheme"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/kenpratt/rusty_scheme'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kenpratt/rusty_scheme" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/kenpratt/rusty_scheme"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/kenpratt/rusty_scheme'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2020c424a065882e064cfee97341219e0da605fd
[INFO] sha for GitHub repo kenpratt/rusty_scheme: 2020c424a065882e064cfee97341219e0da605fd
[INFO] validating manifest of kenpratt/rusty_scheme 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 kenpratt/rusty_scheme 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 kenpratt/rusty_scheme
[INFO] finished frobbing kenpratt/rusty_scheme
[INFO] frobbed toml for kenpratt/rusty_scheme written to work/ex/clippy-test-run/sources/stable/gh/kenpratt/rusty_scheme/Cargo.toml
[INFO] started frobbing kenpratt/rusty_scheme
[INFO] finished frobbing kenpratt/rusty_scheme
[INFO] frobbed toml for kenpratt/rusty_scheme written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/kenpratt/rusty_scheme/Cargo.toml
[INFO] crate kenpratt/rusty_scheme 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 kenpratt/rusty_scheme against stable+rustflags=-Dclippy::into_iter_on_array for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-6/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/kenpratt/rusty_scheme:/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 -Dclippy::into_iter_on_array" "-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] 2232fadf6e2fa58186b748fe1e6acb8cf85b2e69ed453e3499a416b9d30e86bd
[INFO] running `"docker" "start" "-a" "2232fadf6e2fa58186b748fe1e6acb8cf85b2e69ed453e3499a416b9d30e86bd"`
[INFO] [stderr]     Checking libc v0.1.6
[INFO] [stderr]     Checking log v0.3.1
[INFO] [stderr]     Checking getopts v0.2.11
[INFO] [stderr]     Checking rusty_scheme v0.0.2 (/opt/crater/workdir)
[INFO] [stderr] warning: 5th binding whose name is just one char
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:664:42
[INFO] [stderr]     |
[INFO] [stderr] 664 |                                     Some(v) => v,
[INFO] [stderr]     |                                          ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::many_single_char_names)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#many_single_char_names
[INFO] [stderr] 
[INFO] [stderr] warning: using `println!("")`
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:955:13
[INFO] [stderr]     |
[INFO] [stderr] 955 |             println!("");
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::println_empty_string)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: using `println!("")`
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:836:5
[INFO] [stderr]     |
[INFO] [stderr] 836 |     println!("");
[INFO] [stderr]     |     ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: 5th binding whose name is just one char
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:664:42
[INFO] [stderr]     |
[INFO] [stderr] 664 |                                     Some(v) => v,
[INFO] [stderr]     |                                          ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::many_single_char_names)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#many_single_char_names
[INFO] [stderr] 
[INFO] [stderr] warning: using `println!("")`
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:955:13
[INFO] [stderr]     |
[INFO] [stderr] 955 |             println!("");
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::println_empty_string)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: using `println!("")`
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:836:5
[INFO] [stderr]     |
[INFO] [stderr] 836 |     println!("");
[INFO] [stderr]     |     ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: module has the same name as its containing module
[INFO] [stderr]  --> src/interpreter/mod.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub mod interpreter;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::module_inception)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#module_inception
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:714:13
[INFO] [stderr]     |
[INFO] [stderr] 714 |             return Ok(Value::List(new_elements))
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Ok(Value::List(new_elements))`
[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] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:738:5
[INFO] [stderr]     |
[INFO] [stderr] 738 |     return Ok(Value::List(first_vec))
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Ok(Value::List(first_vec))`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: module has the same name as its containing module
[INFO] [stderr]  --> src/interpreter/mod.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub mod interpreter;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::module_inception)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#module_inception
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:714:13
[INFO] [stderr]     |
[INFO] [stderr] 714 |             return Ok(Value::List(new_elements))
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Ok(Value::List(new_elements))`
[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] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:738:5
[INFO] [stderr]     |
[INFO] [stderr] 738 |     return Ok(Value::List(first_vec))
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Ok(Value::List(first_vec))`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: this loop could be written as a `while let` loop
[INFO] [stderr]    --> src/reader/lexer.rs:83:9
[INFO] [stderr]     |
[INFO] [stderr] 83  | /         loop {
[INFO] [stderr] 84  | |             match self.current() {
[INFO] [stderr] 85  | |                 Some(c) => {
[INFO] [stderr] 86  | |                     match c {
[INFO] [stderr] ...   |
[INFO] [stderr] 170 | |             }
[INFO] [stderr] 171 | |         };
[INFO] [stderr]     | |_________^ help: try: `while let Some(c) = self.current() { .. }`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::while_let_loop)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#while_let_loop
[INFO] [stderr] 
[INFO] [stderr] warning: Negation by multiplying with -1
[INFO] [stderr]    --> src/reader/lexer.rs:132:83
[INFO] [stderr]     |
[INFO] [stderr] 132 |                                     self.tokens.push(Token::Integer(if c == '-' { -1 * val } else { val }));
[INFO] [stderr]     |                                                                                   ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::neg_multiply)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#neg_multiply
[INFO] [stderr] 
[INFO] [stderr] warning: this loop could be written as a `while let` loop
[INFO] [stderr]    --> src/reader/lexer.rs:177:9
[INFO] [stderr]     |
[INFO] [stderr] 177 | /         loop {
[INFO] [stderr] 178 | |             match self.current() {
[INFO] [stderr] 179 | |                 Some(c) => {
[INFO] [stderr] 180 | |                     match c {
[INFO] [stderr] ...   |
[INFO] [stderr] 189 | |             }
[INFO] [stderr] 190 | |         }
[INFO] [stderr]     | |_________^ help: try: `while let Some(c) = self.current() { .. }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#while_let_loop
[INFO] [stderr] 
[INFO] [stderr] warning: this loop could be written as a `while let` loop
[INFO] [stderr]    --> src/reader/lexer.rs:218:9
[INFO] [stderr]     |
[INFO] [stderr] 218 | /         loop {
[INFO] [stderr] 219 | |             match self.current() {
[INFO] [stderr] 220 | |                 Some(c) => {
[INFO] [stderr] 221 | |                     match c {
[INFO] [stderr] ...   |
[INFO] [stderr] 235 | |             }
[INFO] [stderr] 236 | |         }
[INFO] [stderr]     | |_________^ help: try: `while let Some(c) = self.current() { .. }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#while_let_loop
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> src/reader/lexer.rs:266:9
[INFO] [stderr]     |
[INFO] [stderr] 266 | /         match self.current() {
[INFO] [stderr] 267 | |             Some(c) => {
[INFO] [stderr] 268 | |                 match c {
[INFO] [stderr] 269 | |                     _ if c.is_whitespace() => (),
[INFO] [stderr] ...   |
[INFO] [stderr] 277 | |             None => ()
[INFO] [stderr] 278 | |         };
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::single_match)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]     |
[INFO] [stderr] 266 |         if let Some(c) = self.current() {
[INFO] [stderr] 267 |     match c {
[INFO] [stderr] 268 |         _ if c.is_whitespace() => (),
[INFO] [stderr] 269 |         ')' => {
[INFO] [stderr] 270 |             self.tokens.push(Token::CloseParen);
[INFO] [stderr] 271 |             self.advance();
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]  --> src/reader/parser.rs:6:22
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn parse(tokens: &Vec<Token>) -> Result<Vec<Node>, ParseError> {
[INFO] [stderr]   |                      ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/reader/parser.rs:45:22
[INFO] [stderr]    |
[INFO] [stderr] 45 |     fn parse(tokens: &Vec<Token>) -> Result<Vec<Node>, ParseError> {
[INFO] [stderr]    |                      ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]    --> src/reader/parser.rs:110:47
[INFO] [stderr]     |
[INFO] [stderr] 110 |                         Ok(Some(Node::Integer(val.clone())))
[INFO] [stderr]     |                                               ^^^^^^^^^^^ help: try dereferencing it: `*val`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::clone_on_copy)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]    --> src/reader/parser.rs:113:47
[INFO] [stderr]     |
[INFO] [stderr] 113 |                         Ok(Some(Node::Boolean(val.clone())))
[INFO] [stderr]     |                                               ^^^^^^^^^^^ help: try dereferencing it: `*val`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/core/repl.rs:26:12
[INFO] [stderr]    |
[INFO] [stderr] 26 |         if cs.len() > 0 {
[INFO] [stderr]    |            ^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!cs.is_empty()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::len_zero)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/core/repl.rs:39:20
[INFO] [stderr]    |
[INFO] [stderr] 39 |                 if input.len() > 0 {
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!input.is_empty()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: this call to `as_ref` does nothing
[INFO] [stderr]   --> src/interpreter/interpreter.rs:38:15
[INFO] [stderr]    |
[INFO] [stderr] 38 |         match t.as_ref() {
[INFO] [stderr]    |               ^^^^^^^^^^ help: try this: `t`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::useless_asref)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_asref
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/interpreter/interpreter.rs:66:38
[INFO] [stderr]    |
[INFO] [stderr] 66 |     pub fn run_file(&self, filename: &String) {
[INFO] [stderr]    |                                      ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: methods called `as_*` usually take self by reference or self by mutable reference; consider choosing a less ambiguous name
[INFO] [stderr]   --> src/interpreter/cps_interpreter.rs:76:18
[INFO] [stderr]    |
[INFO] [stderr] 76 |     fn as_symbol(self) -> Result<String, RuntimeError> {
[INFO] [stderr]    |                  ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::wrong_self_convention)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#wrong_self_convention
[INFO] [stderr] 
[INFO] [stderr] warning: methods called `as_*` usually take self by reference or self by mutable reference; consider choosing a less ambiguous name
[INFO] [stderr]   --> src/interpreter/cps_interpreter.rs:83:19
[INFO] [stderr]    |
[INFO] [stderr] 83 |     fn as_integer(self) -> Result<i64, RuntimeError> {
[INFO] [stderr]    |                   ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#wrong_self_convention
[INFO] [stderr] 
[INFO] [stderr] warning: methods called `as_*` usually take self by reference or self by mutable reference; consider choosing a less ambiguous name
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:104:16
[INFO] [stderr]     |
[INFO] [stderr] 104 |     fn as_list(self) -> Result<List, RuntimeError> {
[INFO] [stderr]     |                ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#wrong_self_convention
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:219:12
[INFO] [stderr]     |
[INFO] [stderr] 219 |         if vec.len() > 0 {
[INFO] [stderr]     |            ^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!vec.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:221:19
[INFO] [stderr]     |
[INFO] [stderr] 221 |             while vec.len() > 0 {
[INFO] [stderr]     |                   ^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!vec.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:252:9
[INFO] [stderr]     |
[INFO] [stderr] 252 | /         match self {
[INFO] [stderr] 253 | |             &List::Cell(_, ref cdr) => 1 + cdr.len(),
[INFO] [stderr] 254 | |             &List::Null => 0
[INFO] [stderr] 255 | |         }
[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] 252 |         match *self {
[INFO] [stderr] 253 |             List::Cell(_, ref cdr) => 1 + cdr.len(),
[INFO] [stderr] 254 |             List::Null => 0
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: methods called `to_*` usually take self by reference; consider choosing a less ambiguous name
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:287:17
[INFO] [stderr]     |
[INFO] [stderr] 287 |     fn to_value(self) -> Value {
[INFO] [stderr]     |                 ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#wrong_self_convention
[INFO] [stderr] 
[INFO] [stderr] warning: methods called `to_*` usually take self by reference; consider choosing a less ambiguous name
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:291:15
[INFO] [stderr]     |
[INFO] [stderr] 291 |     fn to_vec(self) -> Vec<Value> {
[INFO] [stderr]     |               ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#wrong_self_convention
[INFO] [stderr] 
[INFO] [stderr] warning: this loop could be written as a `while let` loop
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:294:9
[INFO] [stderr]     |
[INFO] [stderr] 294 | /         loop {
[INFO] [stderr] 295 | |             match l.shift() {
[INFO] [stderr] 296 | |                 Some((car, cdr)) => {
[INFO] [stderr] 297 | |                     out.push(car);
[INFO] [stderr] ...   |
[INFO] [stderr] 301 | |             }
[INFO] [stderr] 302 | |         }
[INFO] [stderr]     | |_________^ help: try: `while let Some((car, cdr)) = l.shift() { .. }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#while_let_loop
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:628:8
[INFO] [stderr]     |
[INFO] [stderr] 628 |     if exprs.len() == 0 {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `exprs.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: usage of `contains_key` followed by `insert` on a `HashMap`
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:761:9
[INFO] [stderr]     |
[INFO] [stderr] 761 | /         if self.values.contains_key(&key) {
[INFO] [stderr] 762 | |             runtime_error!("Duplicate define: {:?}", key)
[INFO] [stderr] 763 | |         } else {
[INFO] [stderr] 764 | |             self.values.insert(key, value);
[INFO] [stderr] 765 | |             Ok(())
[INFO] [stderr] 766 | |         }
[INFO] [stderr]     | |_________^ help: consider using: `self.values.entry(key)`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::map_entry)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_entry
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:783:24
[INFO] [stderr]     |
[INFO] [stderr] 783 |     fn get(&self, key: &String) -> Option<Value> {
[INFO] [stderr]     |                        ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:952:16
[INFO] [stderr]     |
[INFO] [stderr] 952 |             if args.len() != 0 {
[INFO] [stderr]     |                ^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!args.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider adding a `Default` implementation for `interpreter::ast_walk_interpreter::Interpreter`
[INFO] [stderr]   --> src/interpreter/ast_walk_interpreter.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 | /     pub fn new() -> Interpreter {
[INFO] [stderr] 19 | |         Interpreter { root: Environment::new_root() }
[INFO] [stderr] 20 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::new_without_default)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 17 | impl Default for interpreter::ast_walk_interpreter::Interpreter {
[INFO] [stderr] 18 |     fn default() -> Self {
[INFO] [stderr] 19 |         Self::new()
[INFO] [stderr] 20 |     }
[INFO] [stderr] 21 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: usage of `contains_key` followed by `insert` on a `HashMap`
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:195:9
[INFO] [stderr]     |
[INFO] [stderr] 195 | /         if self.values.contains_key(&key) {
[INFO] [stderr] 196 | |             runtime_error!("Duplicate define: {:?}", key)
[INFO] [stderr] 197 | |         } else {
[INFO] [stderr] 198 | |             self.values.insert(key, value);
[INFO] [stderr] 199 | |             Ok(())
[INFO] [stderr] 200 | |         }
[INFO] [stderr]     | |_________^ help: consider using: `self.values.entry(key)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_entry
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:217:24
[INFO] [stderr]     |
[INFO] [stderr] 217 |     fn get(&self, key: &String) -> Option<Value> {
[INFO] [stderr]     |                        ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:248:5
[INFO] [stderr]     |
[INFO] [stderr] 248 | /     match value {
[INFO] [stderr] 249 | |         &Value::Symbol(ref v) => {
[INFO] [stderr] 250 | |             match env.borrow().get(v) {
[INFO] [stderr] 251 | |                 Some(val) => Ok(val),
[INFO] [stderr] ...   |
[INFO] [stderr] 266 | |         &Value::Macro(ref a, ref b) => Ok(Value::Macro(a.clone(), b.clone())),
[INFO] [stderr] 267 | |     }
[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] 248 |     match *value {
[INFO] [stderr] 249 |         Value::Symbol(ref v) => {
[INFO] [stderr] 250 |             match env.borrow().get(v) {
[INFO] [stderr] 251 |                 Some(val) => Ok(val),
[INFO] [stderr] 252 |                 None => runtime_error!("Identifier not found: {:?}", value)
[INFO] [stderr] 253 |             }
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:259:16
[INFO] [stderr]     |
[INFO] [stderr] 259 |             if vec.len() > 0 {
[INFO] [stderr]     |                ^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!vec.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:271:5
[INFO] [stderr]     |
[INFO] [stderr] 271 | /     match value {
[INFO] [stderr] 272 | |         &Value::Symbol(ref v) => Ok(Value::Symbol(v.clone())),
[INFO] [stderr] 273 | |         &Value::Integer(v) => Ok(Value::Integer(v)),
[INFO] [stderr] 274 | |         &Value::Boolean(v) => Ok(Value::Boolean(v)),
[INFO] [stderr] ...   |
[INFO] [stderr] 290 | |         &Value::Macro(ref a, ref b) => Ok(Value::Macro(a.clone(), b.clone())),
[INFO] [stderr] 291 | |     }
[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] 271 |     match *value {
[INFO] [stderr] 272 |         Value::Symbol(ref v) => Ok(Value::Symbol(v.clone())),
[INFO] [stderr] 273 |         Value::Integer(v) => Ok(Value::Integer(v)),
[INFO] [stderr] 274 |         Value::Boolean(v) => Ok(Value::Boolean(v)),
[INFO] [stderr] 275 |         Value::String(ref v) => Ok(Value::String(v.clone())),
[INFO] [stderr] 276 |         Value::List(ref vec) => {
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:278:25
[INFO] [stderr]     |
[INFO] [stderr] 278 |             if quasi && vec.len() > 0 && vec[0] == Value::Symbol("unquote".to_string()) {
[INFO] [stderr]     |                         ^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!vec.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:294:32
[INFO] [stderr]     |
[INFO] [stderr] 294 | fn evaluate_expression(values: &Vec<Value>, env: Rc<RefCell<Environment>>) -> Result<Value, RuntimeError> {
[INFO] [stderr]     |                                ^^^^^^^^^^^ help: change this to: `&[Value]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:295:8
[INFO] [stderr]     |
[INFO] [stderr] 295 |     if values.len() == 0 {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `values.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: this loop could be written as a `while let` loop
[INFO] [stderr]    --> src/reader/lexer.rs:83:9
[INFO] [stderr]     |
[INFO] [stderr] 83  | /         loop {
[INFO] [stderr] 84  | |             match self.current() {
[INFO] [stderr] 85  | |                 Some(c) => {
[INFO] [stderr] 86  | |                     match c {
[INFO] [stderr] ...   |
[INFO] [stderr] 170 | |             }
[INFO] [stderr] 171 | |         };
[INFO] [stderr]     | |_________^ help: try: `while let Some(c) = self.current() { .. }`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::while_let_loop)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#while_let_loop
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:307:5
[INFO] [stderr]     |
[INFO] [stderr] 307 | /     match func {
[INFO] [stderr] 308 | |         &Function::Native(native_fn) => {
[INFO] [stderr] 309 | |             native_fn(args, env)
[INFO] [stderr] 310 | |         },
[INFO] [stderr] ...   |
[INFO] [stderr] 326 | |         }
[INFO] [stderr] 327 | |     }
[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] 307 |     match *func {
[INFO] [stderr] 308 |         Function::Native(native_fn) => {
[INFO] [stderr] 309 |             native_fn(args, env)
[INFO] [stderr] 310 |         },
[INFO] [stderr] 311 |         Function::Scheme(ref arg_names, ref body, ref func_env) => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: Negation by multiplying with -1
[INFO] [stderr]    --> src/reader/lexer.rs:132:83
[INFO] [stderr]     |
[INFO] [stderr] 132 |                                     self.tokens.push(Token::Integer(if c == '-' { -1 * val } else { val }));
[INFO] [stderr]     |                                                                                   ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::neg_multiply)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#neg_multiply
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:347:17
[INFO] [stderr]     |
[INFO] [stderr] 347 |                 substitutions.get(s).unwrap().clone()
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&substitutions[s]`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::get_unwrap)] on by default
[INFO] [stderr] warning: this loop could be written as a `while let` loop
[INFO] [stderr]    --> src/reader/lexer.rs:177:9
[INFO] [stderr]     |
[INFO] [stderr] 177 | /         loop {
[INFO] [stderr] 178 | |             match self.current() {
[INFO] [stderr] 179 | |                 Some(c) => {
[INFO] [stderr] 180 | |                     match c {
[INFO] [stderr] ...   |
[INFO] [stderr] 189 | |             }
[INFO] [stderr] 190 | |         }
[INFO] [stderr]     | |_________^ help: try: `while let Some(c) = self.current() { .. }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#while_let_loop
[INFO] [stderr] 
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: this loop could be written as a `while let` loop
[INFO] [stderr]    --> src/reader/lexer.rs:218:9
[INFO] [stderr]     |
[INFO] [stderr] 218 | /         loop {
[INFO] [stderr] 219 | |             match self.current() {
[INFO] [stderr] 220 | |                 Some(c) => {
[INFO] [stderr] 221 | |                     match c {
[INFO] [stderr] ...   |
[INFO] [stderr] 235 | |             }
[INFO] [stderr] 236 | |         }
[INFO] [stderr]     | |_________^ help: try: `while let Some(c) = self.current() { .. }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#while_let_loop
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to one
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:372:16
[INFO] [stderr]     |
[INFO] [stderr] 372 |             if list.len() < 1 {
[INFO] [stderr]     |                ^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `list.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> src/reader/lexer.rs:266:9
[INFO] [stderr]     |
[INFO] [stderr] 266 | /         match self.current() {
[INFO] [stderr] 267 | |             Some(c) => {
[INFO] [stderr] 268 | |                 match c {
[INFO] [stderr] 269 | |                     _ if c.is_whitespace() => (),
[INFO] [stderr] ...   |
[INFO] [stderr] 277 | |             None => ()
[INFO] [stderr] 278 | |         };
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::single_match)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]     |
[INFO] [stderr] 266 |         if let Some(c) = self.current() {
[INFO] [stderr] 267 |     match c {
[INFO] [stderr] 268 |         _ if c.is_whitespace() => (),
[INFO] [stderr] 269 |         ')' => {
[INFO] [stderr] 270 |             self.tokens.push(Token::CloseParen);
[INFO] [stderr] 271 |             self.advance();
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to one
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:403:16
[INFO] [stderr]     |
[INFO] [stderr] 403 |             if list.len() < 1 {
[INFO] [stderr]     |                ^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `list.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to one
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:428:8
[INFO] [stderr]     |
[INFO] [stderr] 428 |     if args.len() < 1 {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `args.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]  --> src/reader/parser.rs:6:22
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn parse(tokens: &Vec<Token>) -> Result<Vec<Node>, ParseError> {
[INFO] [stderr]   |                      ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/reader/parser.rs:45:22
[INFO] [stderr]    |
[INFO] [stderr] 45 |     fn parse(tokens: &Vec<Token>) -> Result<Vec<Node>, ParseError> {
[INFO] [stderr]    |                      ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]    --> src/reader/parser.rs:110:47
[INFO] [stderr]     |
[INFO] [stderr] 110 |                         Ok(Some(Node::Integer(val.clone())))
[INFO] [stderr]     |                                               ^^^^^^^^^^^ help: try dereferencing it: `*val`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::clone_on_copy)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]    --> src/reader/parser.rs:113:47
[INFO] [stderr]     |
[INFO] [stderr] 113 |                         Ok(Some(Node::Boolean(val.clone())))
[INFO] [stderr]     |                                               ^^^^^^^^^^^ help: try dereferencing it: `*val`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/core/repl.rs:26:12
[INFO] [stderr]    |
[INFO] [stderr] 26 |         if cs.len() > 0 {
[INFO] [stderr]    |            ^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!cs.is_empty()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::len_zero)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/core/repl.rs:39:20
[INFO] [stderr]    |
[INFO] [stderr] 39 |                 if input.len() > 0 {
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!input.is_empty()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: this call to `as_ref` does nothing
[INFO] [stderr]   --> src/interpreter/interpreter.rs:38:15
[INFO] [stderr]    |
[INFO] [stderr] 38 |         match t.as_ref() {
[INFO] [stderr]    |               ^^^^^^^^^^ help: try this: `t`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::useless_asref)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_asref
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:655:45
[INFO] [stderr]     |
[INFO] [stderr] 655 |         Value::List(l) => Ok(Value::Boolean(l.len() == 0)),
[INFO] [stderr]     |                                             ^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `l.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: methods called `as_*` usually take self by reference or self by mutable reference; consider choosing a less ambiguous name
[INFO] [stderr]   --> src/interpreter/cps_interpreter.rs:76:18
[INFO] [stderr]    |
[INFO] [stderr] 76 |     fn as_symbol(self) -> Result<String, RuntimeError> {
[INFO] [stderr]    |                  ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::wrong_self_convention)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#wrong_self_convention
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:673:16
[INFO] [stderr]     |
[INFO] [stderr] 673 |             if l.len() > 0 {
[INFO] [stderr]     |                ^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!l.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: methods called `as_*` usually take self by reference or self by mutable reference; consider choosing a less ambiguous name
[INFO] [stderr]   --> src/interpreter/cps_interpreter.rs:83:19
[INFO] [stderr]    |
[INFO] [stderr] 83 |     fn as_integer(self) -> Result<i64, RuntimeError> {
[INFO] [stderr]    |                   ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#wrong_self_convention
[INFO] [stderr] 
[INFO] [stderr] warning: methods called `as_*` usually take self by reference or self by mutable reference; consider choosing a less ambiguous name
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:104:16
[INFO] [stderr]     |
[INFO] [stderr] 104 |     fn as_list(self) -> Result<List, RuntimeError> {
[INFO] [stderr]     |                ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#wrong_self_convention
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:690:16
[INFO] [stderr]     |
[INFO] [stderr] 690 |             if l.len() > 0 {
[INFO] [stderr]     |                ^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!l.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:833:8
[INFO] [stderr]     |
[INFO] [stderr] 833 |     if args.len() != 0 {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!args.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:219:12
[INFO] [stderr]     |
[INFO] [stderr] 219 |         if vec.len() > 0 {
[INFO] [stderr]     |            ^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!vec.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:221:19
[INFO] [stderr]     |
[INFO] [stderr] 221 |             while vec.len() > 0 {
[INFO] [stderr]     |                   ^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!vec.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:252:9
[INFO] [stderr]     |
[INFO] [stderr] 252 | /         match self {
[INFO] [stderr] 253 | |             &List::Cell(_, ref cdr) => 1 + cdr.len(),
[INFO] [stderr] 254 | |             &List::Null => 0
[INFO] [stderr] 255 | |         }
[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] 252 |         match *self {
[INFO] [stderr] 253 |             List::Cell(_, ref cdr) => 1 + cdr.len(),
[INFO] [stderr] 254 |             List::Null => 0
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: methods called `to_*` usually take self by reference; consider choosing a less ambiguous name
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:287:17
[INFO] [stderr]     |
[INFO] [stderr] 287 |     fn to_value(self) -> Value {
[INFO] [stderr]     |                 ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#wrong_self_convention
[INFO] [stderr] 
[INFO] [stderr] warning: methods called `to_*` usually take self by reference; consider choosing a less ambiguous name
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:291:15
[INFO] [stderr]     |
[INFO] [stderr] 291 |     fn to_vec(self) -> Vec<Value> {
[INFO] [stderr]     |               ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#wrong_self_convention
[INFO] [stderr] 
[INFO] [stderr] warning: this loop could be written as a `while let` loop
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:294:9
[INFO] [stderr]     |
[INFO] [stderr] 294 | /         loop {
[INFO] [stderr] 295 | |             match l.shift() {
[INFO] [stderr] 296 | |                 Some((car, cdr)) => {
[INFO] [stderr] 297 | |                     out.push(car);
[INFO] [stderr] ...   |
[INFO] [stderr] 301 | |             }
[INFO] [stderr] 302 | |         }
[INFO] [stderr]     | |_________^ help: try: `while let Some((car, cdr)) = l.shift() { .. }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#while_let_loop
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:628:8
[INFO] [stderr]     |
[INFO] [stderr] 628 |     if exprs.len() == 0 {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `exprs.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: usage of `contains_key` followed by `insert` on a `HashMap`
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:761:9
[INFO] [stderr]     |
[INFO] [stderr] 761 | /         if self.values.contains_key(&key) {
[INFO] [stderr] 762 | |             runtime_error!("Duplicate define: {:?}", key)
[INFO] [stderr] 763 | |         } else {
[INFO] [stderr] 764 | |             self.values.insert(key, value);
[INFO] [stderr] 765 | |             Ok(())
[INFO] [stderr] 766 | |         }
[INFO] [stderr]     | |_________^ help: consider using: `self.values.entry(key)`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::map_entry)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_entry
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:783:24
[INFO] [stderr]     |
[INFO] [stderr] 783 |     fn get(&self, key: &String) -> Option<Value> {
[INFO] [stderr]     |                        ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/cps_interpreter.rs:952:16
[INFO] [stderr]     |
[INFO] [stderr] 952 |             if args.len() != 0 {
[INFO] [stderr]     |                ^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!args.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider adding a `Default` implementation for `interpreter::ast_walk_interpreter::Interpreter`
[INFO] [stderr]   --> src/interpreter/ast_walk_interpreter.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 | /     pub fn new() -> Interpreter {
[INFO] [stderr] 19 | |         Interpreter { root: Environment::new_root() }
[INFO] [stderr] 20 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::new_without_default)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 17 | impl Default for interpreter::ast_walk_interpreter::Interpreter {
[INFO] [stderr] 18 |     fn default() -> Self {
[INFO] [stderr] 19 |         Self::new()
[INFO] [stderr] 20 |     }
[INFO] [stderr] 21 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: usage of `contains_key` followed by `insert` on a `HashMap`
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:195:9
[INFO] [stderr]     |
[INFO] [stderr] 195 | /         if self.values.contains_key(&key) {
[INFO] [stderr] 196 | |             runtime_error!("Duplicate define: {:?}", key)
[INFO] [stderr] 197 | |         } else {
[INFO] [stderr] 198 | |             self.values.insert(key, value);
[INFO] [stderr] 199 | |             Ok(())
[INFO] [stderr] 200 | |         }
[INFO] [stderr]     | |_________^ help: consider using: `self.values.entry(key)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_entry
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:217:24
[INFO] [stderr]     |
[INFO] [stderr] 217 |     fn get(&self, key: &String) -> Option<Value> {
[INFO] [stderr]     |                        ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:248:5
[INFO] [stderr]     |
[INFO] [stderr] 248 | /     match value {
[INFO] [stderr] 249 | |         &Value::Symbol(ref v) => {
[INFO] [stderr] 250 | |             match env.borrow().get(v) {
[INFO] [stderr] 251 | |                 Some(val) => Ok(val),
[INFO] [stderr] ...   |
[INFO] [stderr] 266 | |         &Value::Macro(ref a, ref b) => Ok(Value::Macro(a.clone(), b.clone())),
[INFO] [stderr] 267 | |     }
[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] 248 |     match *value {
[INFO] [stderr] 249 |         Value::Symbol(ref v) => {
[INFO] [stderr] 250 |             match env.borrow().get(v) {
[INFO] [stderr] 251 |                 Some(val) => Ok(val),
[INFO] [stderr] 252 |                 None => runtime_error!("Identifier not found: {:?}", value)
[INFO] [stderr] 253 |             }
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:259:16
[INFO] [stderr]     |
[INFO] [stderr] 259 |             if vec.len() > 0 {
[INFO] [stderr]     |                ^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!vec.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:271:5
[INFO] [stderr]     |
[INFO] [stderr] 271 | /     match value {
[INFO] [stderr] 272 | |         &Value::Symbol(ref v) => Ok(Value::Symbol(v.clone())),
[INFO] [stderr] 273 | |         &Value::Integer(v) => Ok(Value::Integer(v)),
[INFO] [stderr] 274 | |         &Value::Boolean(v) => Ok(Value::Boolean(v)),
[INFO] [stderr] ...   |
[INFO] [stderr] 290 | |         &Value::Macro(ref a, ref b) => Ok(Value::Macro(a.clone(), b.clone())),
[INFO] [stderr] 291 | |     }
[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] 271 |     match *value {
[INFO] [stderr] 272 |         Value::Symbol(ref v) => Ok(Value::Symbol(v.clone())),
[INFO] [stderr] 273 |         Value::Integer(v) => Ok(Value::Integer(v)),
[INFO] [stderr] 274 |         Value::Boolean(v) => Ok(Value::Boolean(v)),
[INFO] [stderr] 275 |         Value::String(ref v) => Ok(Value::String(v.clone())),
[INFO] [stderr] 276 |         Value::List(ref vec) => {
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:278:25
[INFO] [stderr]     |
[INFO] [stderr] 278 |             if quasi && vec.len() > 0 && vec[0] == Value::Symbol("unquote".to_string()) {
[INFO] [stderr]     |                         ^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!vec.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:294:32
[INFO] [stderr]     |
[INFO] [stderr] 294 | fn evaluate_expression(values: &Vec<Value>, env: Rc<RefCell<Environment>>) -> Result<Value, RuntimeError> {
[INFO] [stderr]     |                                ^^^^^^^^^^^ help: change this to: `&[Value]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:295:8
[INFO] [stderr]     |
[INFO] [stderr] 295 |     if values.len() == 0 {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `values.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:307:5
[INFO] [stderr]     |
[INFO] [stderr] 307 | /     match func {
[INFO] [stderr] 308 | |         &Function::Native(native_fn) => {
[INFO] [stderr] 309 | |             native_fn(args, env)
[INFO] [stderr] 310 | |         },
[INFO] [stderr] ...   |
[INFO] [stderr] 326 | |         }
[INFO] [stderr] 327 | |     }
[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] 307 |     match *func {
[INFO] [stderr] 308 |         Function::Native(native_fn) => {
[INFO] [stderr] 309 |             native_fn(args, env)
[INFO] [stderr] 310 |         },
[INFO] [stderr] 311 |         Function::Scheme(ref arg_names, ref body, ref func_env) => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:347:17
[INFO] [stderr]     |
[INFO] [stderr] 347 |                 substitutions.get(s).unwrap().clone()
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&substitutions[s]`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::get_unwrap)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to one
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:372:16
[INFO] [stderr]     |
[INFO] [stderr] 372 |             if list.len() < 1 {
[INFO] [stderr]     |                ^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `list.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to one
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:403:16
[INFO] [stderr]     |
[INFO] [stderr] 403 |             if list.len() < 1 {
[INFO] [stderr]     |                ^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `list.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to one
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:428:8
[INFO] [stderr]     |
[INFO] [stderr] 428 |     if args.len() < 1 {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `args.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:655:45
[INFO] [stderr]     |
[INFO] [stderr] 655 |         Value::List(l) => Ok(Value::Boolean(l.len() == 0)),
[INFO] [stderr]     |                                             ^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `l.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:673:16
[INFO] [stderr]     |
[INFO] [stderr] 673 |             if l.len() > 0 {
[INFO] [stderr]     |                ^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!l.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:690:16
[INFO] [stderr]     |
[INFO] [stderr] 690 |             if l.len() > 0 {
[INFO] [stderr]     |                ^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!l.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/interpreter/ast_walk_interpreter.rs:833:8
[INFO] [stderr]     |
[INFO] [stderr] 833 |     if args.len() != 0 {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!args.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> src/main.rs:57:1
[INFO] [stderr]    |
[INFO] [stderr] 57 | / macro_rules! assert_execute_all {
[INFO] [stderr] 58 | |     ($src:expr, $res:expr) => (
[INFO] [stderr] 59 | |         assert_execute_ast_walk!($src, $res);
[INFO] [stderr] 60 | |         assert_execute_cps!($src, $res);
[INFO] [stderr] 61 | |     )
[INFO] [stderr] 62 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_macros)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> src/main.rs:64:1
[INFO] [stderr]    |
[INFO] [stderr] 64 | / macro_rules! assert_execute_fail_all {
[INFO] [stderr] 65 | |     ($src:expr, $res:expr) => (
[INFO] [stderr] 66 | |         assert_execute_fail_ast_walk!($src, $res);
[INFO] [stderr] 67 | |         assert_execute_fail_cps!($src, $res);
[INFO] [stderr] 68 | |     )
[INFO] [stderr] 69 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> src/main.rs:71:1
[INFO] [stderr]    |
[INFO] [stderr] 71 | / macro_rules! assert_execute_ast_walk {
[INFO] [stderr] 72 | |     ($src:expr, $res:expr) => (assert_eq!(interpreter::new("ast_walk").execute($src).unwrap(), $res));
[INFO] [stderr] 73 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> src/main.rs:75:1
[INFO] [stderr]    |
[INFO] [stderr] 75 | / macro_rules! assert_execute_fail_ast_walk {
[INFO] [stderr] 76 | |     ($src:expr, $res:expr) => (assert_eq!(interpreter::new("ast_walk").execute($src).err().unwrap(), $res));
[INFO] [stderr] 77 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> src/main.rs:79:1
[INFO] [stderr]    |
[INFO] [stderr] 79 | / macro_rules! assert_execute_cps {
[INFO] [stderr] 80 | |     ($src:expr, $res:expr) => (assert_eq!(interpreter::new("cps").execute($src).unwrap(), $res));
[INFO] [stderr] 81 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> src/main.rs:83:1
[INFO] [stderr]    |
[INFO] [stderr] 83 | / macro_rules! assert_execute_fail_cps {
[INFO] [stderr] 84 | |     ($src:expr, $res:expr) => (assert_eq!(interpreter::new("cps").execute($src).err().unwrap(), $res));
[INFO] [stderr] 85 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.55s
[INFO] running `"docker" "inspect" "2232fadf6e2fa58186b748fe1e6acb8cf85b2e69ed453e3499a416b9d30e86bd"`
[INFO] running `"docker" "rm" "-f" "2232fadf6e2fa58186b748fe1e6acb8cf85b2e69ed453e3499a416b9d30e86bd"`
[INFO] [stdout] 2232fadf6e2fa58186b748fe1e6acb8cf85b2e69ed453e3499a416b9d30e86bd