[INFO] updating cached repository qnnnnez/rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/qnnnnez/rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/qnnnnez/rs" "work/ex/clippy-test-run/sources/stable/gh/qnnnnez/rs"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/qnnnnez/rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/qnnnnez/rs" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/qnnnnez/rs"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/qnnnnez/rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c060239da32ca20a9d77c5ac2bf12f2d1c62f77e
[INFO] sha for GitHub repo qnnnnez/rs: c060239da32ca20a9d77c5ac2bf12f2d1c62f77e
[INFO] validating manifest of qnnnnez/rs 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 qnnnnez/rs 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 qnnnnez/rs
[INFO] finished frobbing qnnnnez/rs
[INFO] frobbed toml for qnnnnez/rs written to work/ex/clippy-test-run/sources/stable/gh/qnnnnez/rs/Cargo.toml
[INFO] started frobbing qnnnnez/rs
[INFO] finished frobbing qnnnnez/rs
[INFO] frobbed toml for qnnnnez/rs written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/qnnnnez/rs/Cargo.toml
[INFO] crate qnnnnez/rs 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 qnnnnez/rs against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-0/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/qnnnnez/rs:/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] 4fb966942b484b7698f34e72a48d981f500f7d2e21a6468f04b8c80fd033fb7a
[INFO] running `"docker" "start" "-a" "4fb966942b484b7698f34e72a48d981f500f7d2e21a6468f04b8c80fd033fb7a"`
[INFO] [stderr]     Checking rs v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/interpreter.rs:185:13
[INFO] [stderr]     |
[INFO] [stderr] 185 |             or: or,
[INFO] [stderr]     |             ^^^^^^ help: replace it with: `or`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/interpreter.rs:230:49
[INFO] [stderr]     |
[INFO] [stderr] 230 |         let result = Ok(ASTNode::CreateBinding {bindings: bindings, body: body});
[INFO] [stderr]     |                                                 ^^^^^^^^^^^^^^^^^^ help: replace it with: `bindings`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/interpreter.rs:230:69
[INFO] [stderr]     |
[INFO] [stderr] 230 |         let result = Ok(ASTNode::CreateBinding {bindings: bindings, body: body});
[INFO] [stderr]     |                                                                     ^^^^^^^^^^ help: replace it with: `body`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/interpreter.rs:271:48
[INFO] [stderr]     |
[INFO] [stderr] 271 |         let result = Ok(ASTNode::CreateLambda {args: args, body: body, closure: closure_list});
[INFO] [stderr]     |                                                ^^^^^^^^^^ help: replace it with: `args`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/interpreter.rs:271:60
[INFO] [stderr]     |
[INFO] [stderr] 271 |         let result = Ok(ASTNode::CreateLambda {args: args, body: body, closure: closure_list});
[INFO] [stderr]     |                                                            ^^^^^^^^^^ help: replace it with: `body`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/interpreter.rs:185:13
[INFO] [stderr]     |
[INFO] [stderr] 185 |             or: or,
[INFO] [stderr]     |             ^^^^^^ help: replace it with: `or`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/interpreter.rs:230:49
[INFO] [stderr]     |
[INFO] [stderr] 230 |         let result = Ok(ASTNode::CreateBinding {bindings: bindings, body: body});
[INFO] [stderr]     |                                                 ^^^^^^^^^^^^^^^^^^ help: replace it with: `bindings`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/interpreter.rs:230:69
[INFO] [stderr]     |
[INFO] [stderr] 230 |         let result = Ok(ASTNode::CreateBinding {bindings: bindings, body: body});
[INFO] [stderr]     |                                                                     ^^^^^^^^^^ help: replace it with: `body`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/interpreter.rs:271:48
[INFO] [stderr]     |
[INFO] [stderr] 271 |         let result = Ok(ASTNode::CreateLambda {args: args, body: body, closure: closure_list});
[INFO] [stderr]     |                                                ^^^^^^^^^^ help: replace it with: `args`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/interpreter.rs:271:60
[INFO] [stderr]     |
[INFO] [stderr] 271 |         let result = Ok(ASTNode::CreateLambda {args: args, body: body, closure: closure_list});
[INFO] [stderr]     |                                                            ^^^^^^^^^^ help: replace it with: `body`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `BTreeMap`
[INFO] [stderr]  --> src/main.rs:1:24
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::{BTreeMap, BTreeSet};
[INFO] [stderr]   |                        ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `BTreeMap`
[INFO] [stderr]  --> src/main.rs:1:24
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::{BTreeMap, BTreeSet};
[INFO] [stderr]   |                        ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/sexpr.rs:109:44
[INFO] [stderr]     |
[INFO] [stderr] 109 |                     result = result * 10 + d as i64;
[INFO] [stderr]     |                                            ^^^^^^^^ help: try: `i64::from(d)`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::cast_lossless)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: redundant pattern matching, consider using `is_none()`
[INFO] [stderr]    --> src/sexpr.rs:133:24
[INFO] [stderr]     |
[INFO] [stderr] 133 |                   if let None = ch {
[INFO] [stderr]     |  _________________-      ^^^^
[INFO] [stderr] 134 | |                     return Some(Err("excepting #t, #f or char, found eof".to_string()));
[INFO] [stderr] 135 | |                 }
[INFO] [stderr]     | |_________________- help: try this: `if ch.is_none()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::redundant_pattern_matching)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stderr] 
[INFO] [stderr] warning: redundant pattern matching, consider using `is_none()`
[INFO] [stderr]    --> src/sexpr.rs:168:16
[INFO] [stderr]     |
[INFO] [stderr] 168 |           if let None = self.peek() {
[INFO] [stderr]     |  _________-      ^^^^
[INFO] [stderr] 169 | |             true
[INFO] [stderr] 170 | |         } else {
[INFO] [stderr] 171 | |             false
[INFO] [stderr] 172 | |         }
[INFO] [stderr]     | |_________- help: try this: `if self.peek().is_none()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stderr] 
[INFO] [stderr] warning: equality checks against true are unnecessary
[INFO] [stderr]   --> src/interpreter.rs:56:12
[INFO] [stderr]    |
[INFO] [stderr] 56 |         if value == true {
[INFO] [stderr]    |            ^^^^^^^^^^^^^ help: try simplifying it as shown: `value`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::bool_comparison)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#bool_comparison
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/sexpr.rs:109:44
[INFO] [stderr]     |
[INFO] [stderr] 109 |                     result = result * 10 + d as i64;
[INFO] [stderr]     |                                            ^^^^^^^^ help: try: `i64::from(d)`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::cast_lossless)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: redundant pattern matching, consider using `is_none()`
[INFO] [stderr]    --> src/sexpr.rs:133:24
[INFO] [stderr]     |
[INFO] [stderr] 133 |                   if let None = ch {
[INFO] [stderr]     |  _________________-      ^^^^
[INFO] [stderr] 134 | |                     return Some(Err("excepting #t, #f or char, found eof".to_string()));
[INFO] [stderr] 135 | |                 }
[INFO] [stderr]     | |_________________- help: try this: `if ch.is_none()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::redundant_pattern_matching)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stderr] 
[INFO] [stderr] warning: redundant pattern matching, consider using `is_none()`
[INFO] [stderr]    --> src/sexpr.rs:168:16
[INFO] [stderr]     |
[INFO] [stderr] 168 |           if let None = self.peek() {
[INFO] [stderr]     |  _________-      ^^^^
[INFO] [stderr] 169 | |             true
[INFO] [stderr] 170 | |         } else {
[INFO] [stderr] 171 | |             false
[INFO] [stderr] 172 | |         }
[INFO] [stderr]     | |_________- help: try this: `if self.peek().is_none()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[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.rs:149:42
[INFO] [stderr]     |
[INFO] [stderr] 149 |     fn parse_sexpr_list(&mut self, list: &Vec<SExpr>, closure: &mut BTreeSet<u32>) -> Result<ASTNode, String> {
[INFO] [stderr]     |                                          ^^^^^^^^^^^ help: change this to: `&[SExpr]`
[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: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> src/interpreter.rs:154:9
[INFO] [stderr]     |
[INFO] [stderr] 154 | /         match &list[0] {
[INFO] [stderr] 155 | |             SExpr::Atom(SAtom::Symbol(sym)) => {
[INFO] [stderr] 156 | |                 match sym.as_ref() {
[INFO] [stderr] 157 | |                     "if" => {return self.parse_sexpr_if(list, closure)},
[INFO] [stderr] ...   |
[INFO] [stderr] 163 | |             _ => { }
[INFO] [stderr] 164 | |         }
[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] 154 |         if let SExpr::Atom(SAtom::Symbol(sym)) = &list[0] {
[INFO] [stderr] 155 |     match sym.as_ref() {
[INFO] [stderr] 156 |         "if" => {return self.parse_sexpr_if(list, closure)},
[INFO] [stderr] 157 |         "let" => {return self.parse_sexpr_let(list, closure)},
[INFO] [stderr] 158 |         "lambda" => {return self.parse_sexpr_lambda(list, closure)},
[INFO] [stderr] 159 |         _ => { }
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/interpreter.rs:167:27
[INFO] [stderr]     |
[INFO] [stderr] 167 |         for sexpr in list.into_iter() {
[INFO] [stderr]     |                           ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::into_iter_on_ref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[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.rs:173:40
[INFO] [stderr]     |
[INFO] [stderr] 173 |     fn parse_sexpr_if(&mut self, list: &Vec<SExpr>, closure: &mut BTreeSet<u32>) -> Result<ASTNode, String> {
[INFO] [stderr]     |                                        ^^^^^^^^^^^ help: change this to: `&[SExpr]`
[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: equality checks against true are unnecessary
[INFO] [stderr]   --> src/interpreter.rs:56:12
[INFO] [stderr]    |
[INFO] [stderr] 56 |         if value == true {
[INFO] [stderr]    |            ^^^^^^^^^^^^^ help: try simplifying it as shown: `value`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::bool_comparison)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#bool_comparison
[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.rs:189:41
[INFO] [stderr]     |
[INFO] [stderr] 189 |     fn parse_sexpr_let(&mut self, list: &Vec<SExpr>, closure: &mut BTreeSet<u32>) -> Result<ASTNode, String> {
[INFO] [stderr]     |                                         ^^^^^^^^^^^ help: change this to: `&[SExpr]`
[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: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/interpreter.rs:198:42
[INFO] [stderr]     |
[INFO] [stderr] 198 |                 for binding in sbindings.into_iter() {
[INFO] [stderr]     |                                          ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/interpreter.rs:223:27
[INFO] [stderr]     |
[INFO] [stderr] 223 |         let mut it = list.into_iter();
[INFO] [stderr]     |                           ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[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.rs:239:44
[INFO] [stderr]     |
[INFO] [stderr] 239 |     fn parse_sexpr_lambda(&mut self, list: &Vec<SExpr>, closure: &mut BTreeSet<u32>) -> Result<ASTNode, String> {
[INFO] [stderr]     |                                            ^^^^^^^^^^^ help: change this to: `&[SExpr]`
[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: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/interpreter.rs:149:42
[INFO] [stderr]     |
[INFO] [stderr] 149 |     fn parse_sexpr_list(&mut self, list: &Vec<SExpr>, closure: &mut BTreeSet<u32>) -> Result<ASTNode, String> {
[INFO] [stderr]     |                                          ^^^^^^^^^^^ help: change this to: `&[SExpr]`
[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: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/interpreter.rs:247:30
[INFO] [stderr]     |
[INFO] [stderr] 247 |             for arg in sargs.into_iter() {
[INFO] [stderr]     |                              ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/interpreter.rs:260:27
[INFO] [stderr]     |
[INFO] [stderr] 260 |         let mut it = list.into_iter();
[INFO] [stderr]     |                           ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[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/interpreter.rs:154:9
[INFO] [stderr]     |
[INFO] [stderr] 154 | /         match &list[0] {
[INFO] [stderr] 155 | |             SExpr::Atom(SAtom::Symbol(sym)) => {
[INFO] [stderr] 156 | |                 match sym.as_ref() {
[INFO] [stderr] 157 | |                     "if" => {return self.parse_sexpr_if(list, closure)},
[INFO] [stderr] ...   |
[INFO] [stderr] 163 | |             _ => { }
[INFO] [stderr] 164 | |         }
[INFO] [stderr]     | |_________^
[INFO] [stderr] warning: use of `or_insert` followed by a function call
[INFO] [stderr]    --> src/interpreter.rs:290:47
[INFO] [stderr]     |
[INFO] [stderr] 290 |         let stack = self.name_map.entry(name).or_insert(vec![]);
[INFO] [stderr]     |                                               ^^^^^^^^^^^^^^^^^ help: try this: `or_insert_with(|| vec![])`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::or_fun_call)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#or_fun_call
[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] 154 |         if let SExpr::Atom(SAtom::Symbol(sym)) = &list[0] {
[INFO] [stderr] 155 |     match sym.as_ref() {
[INFO] [stderr] 156 |         "if" => {return self.parse_sexpr_if(list, closure)},
[INFO] [stderr] 157 |         "let" => {return self.parse_sexpr_let(list, closure)},
[INFO] [stderr] 158 |         "lambda" => {return self.parse_sexpr_lambda(list, closure)},
[INFO] [stderr] 159 |         _ => { }
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/interpreter.rs:167:27
[INFO] [stderr]     |
[INFO] [stderr] 167 |         for sexpr in list.into_iter() {
[INFO] [stderr]     |                           ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::into_iter_on_ref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[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.rs:173:40
[INFO] [stderr]     |
[INFO] [stderr] 173 |     fn parse_sexpr_if(&mut self, list: &Vec<SExpr>, closure: &mut BTreeSet<u32>) -> Result<ASTNode, String> {
[INFO] [stderr]     |                                        ^^^^^^^^^^^ help: change this to: `&[SExpr]`
[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: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/interpreter.rs:189:41
[INFO] [stderr]     |
[INFO] [stderr] 189 |     fn parse_sexpr_let(&mut self, list: &Vec<SExpr>, closure: &mut BTreeSet<u32>) -> Result<ASTNode, String> {
[INFO] [stderr]     |                                         ^^^^^^^^^^^ help: change this to: `&[SExpr]`
[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: called `.get().unwrap()` on a BTreeMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/interpreter.rs:315:24
[INFO] [stderr]     |
[INFO] [stderr] 315 |                     Ok(self.locals.get(index).unwrap().clone())
[INFO] [stderr]     |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.locals[index]`
[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: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/interpreter.rs:335:39
[INFO] [stderr]     |
[INFO] [stderr] 335 |                     let mut it = call.into_iter();
[INFO] [stderr]     |                                       ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/interpreter.rs:198:42
[INFO] [stderr]     |
[INFO] [stderr] 198 |                 for binding in sbindings.into_iter() {
[INFO] [stderr]     |                                          ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/interpreter.rs:350:46
[INFO] [stderr]     |
[INFO] [stderr] 350 |                 for (index, ast) in bindings.into_iter() {
[INFO] [stderr]     |                                              ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/interpreter.rs:356:33
[INFO] [stderr]     |
[INFO] [stderr] 356 |                 for ast in body.into_iter() {
[INFO] [stderr]     |                                 ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/interpreter.rs:360:44
[INFO] [stderr]     |
[INFO] [stderr] 360 |                 for (index, _) in bindings.into_iter() {
[INFO] [stderr]     |                                            ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/interpreter.rs:223:27
[INFO] [stderr]     |
[INFO] [stderr] 223 |         let mut it = list.into_iter();
[INFO] [stderr]     |                           ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[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.rs:239:44
[INFO] [stderr]     |
[INFO] [stderr] 239 |     fn parse_sexpr_lambda(&mut self, list: &Vec<SExpr>, closure: &mut BTreeSet<u32>) -> Result<ASTNode, String> {
[INFO] [stderr]     |                                            ^^^^^^^^^^^ help: change this to: `&[SExpr]`
[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: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/interpreter.rs:373:39
[INFO] [stderr]     |
[INFO] [stderr] 373 |     fn create_lambda(&mut self, args: &Vec<u32>, body: &Vec<ASTNode>, closure: &Vec<u32>) -> Box<CallableValue> {
[INFO] [stderr]     |                                       ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] help: change this to
[INFO] [stderr]     |
[INFO] [stderr] 373 |     fn create_lambda(&mut self, args: &[u32], body: &Vec<ASTNode>, closure: &Vec<u32>) -> Box<CallableValue> {
[INFO] [stderr]     |                                       ^^^^^^
[INFO] [stderr] help: change `args.clone()` to
[INFO] [stderr]     |
[INFO] [stderr] 432 |             args: args.to_owned(),
[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/interpreter.rs:373:56
[INFO] [stderr]     |
[INFO] [stderr] 373 |     fn create_lambda(&mut self, args: &Vec<u32>, body: &Vec<ASTNode>, closure: &Vec<u32>) -> Box<CallableValue> {
[INFO] [stderr]     |                                                        ^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] help: change this to
[INFO] [stderr]     |
[INFO] [stderr] 373 |     fn create_lambda(&mut self, args: &Vec<u32>, body: &[ASTNode], closure: &Vec<u32>) -> Box<CallableValue> {
[INFO] [stderr]     |                                                        ^^^^^^^^^^
[INFO] [stderr] help: change `body.clone()` to
[INFO] [stderr]     |
[INFO] [stderr] 433 |             body: body.to_owned(),
[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/interpreter.rs:373:80
[INFO] [stderr]     |
[INFO] [stderr] 373 |     fn create_lambda(&mut self, args: &Vec<u32>, body: &Vec<ASTNode>, closure: &Vec<u32>) -> Box<CallableValue> {
[INFO] [stderr]     |                                                                                ^^^^^^^^^ help: change this to: `&[u32]`
[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: the loop variable `i` is used to index `arg_values`
[INFO] [stderr]    --> src/interpreter.rs:391:26
[INFO] [stderr]     |
[INFO] [stderr] 391 |                 for i in 0..self.args.len() {
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::needless_range_loop)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stderr] help: consider using an iterator
[INFO] [stderr]     |
[INFO] [stderr] 391 |                 for (i, <item>) in arg_values.iter().enumerate().take(self.args.len()) {
[INFO] [stderr]     |                     ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: redundant pattern matching, consider using `is_none()`
[INFO] [stderr]    --> src/interpreter.rs:398:28
[INFO] [stderr]     |
[INFO] [stderr] 398 |                       if let None = interpreter.locals.get(index) {
[INFO] [stderr]     |  _____________________-      ^^^^
[INFO] [stderr] 399 | |                         interpreter.locals.insert(*index, value_ref.clone());
[INFO] [stderr] 400 | |                         injected_closure.push(*index);
[INFO] [stderr] 401 | |                     }
[INFO] [stderr]     | |_____________________- help: try this: `if interpreter.locals.get(index).is_none()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stderr] 
[INFO] [stderr] warning: very complex type used. Consider factoring parts into `type` definitions
[INFO] [stderr]    --> src/interpreter.rs:440:23
[INFO] [stderr]     |
[INFO] [stderr] 440 |             callable: Box<Fn(&mut Interpreter, Vec<ValueRef>) -> Result<ValueRef, String>>,
[INFO] [stderr]     |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]     = note: #[warn(clippy::type_complexity)] on by default
[INFO] [stderr]    --> src/interpreter.rs:247:30
[INFO] [stderr]     |
[INFO] [stderr] 247 |             for arg in sargs.into_iter() {
[INFO] [stderr]     |                              ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity
[INFO] [stderr] 
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/interpreter.rs:260:27
[INFO] [stderr]     |
[INFO] [stderr] 260 |         let mut it = list.into_iter();
[INFO] [stderr]     |                           ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: very complex type used. Consider factoring parts into `type` definitions
[INFO] [stderr]    --> src/interpreter.rs:469:42
[INFO] [stderr]     |
[INFO] [stderr] 469 |         let mut inject = |name: &str, f: Box<Fn(&mut Interpreter, Vec<ValueRef>) -> Result<ValueRef, String>>| {
[INFO] [stderr]     |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity
[INFO] [stderr] 
[INFO] [stderr] warning: use of `or_insert` followed by a function call
[INFO] [stderr]    --> src/interpreter.rs:290:47
[INFO] [stderr]     |
[INFO] [stderr] 290 |         let stack = self.name_map.entry(name).or_insert(vec![]);
[INFO] [stderr]     |                                               ^^^^^^^^^^^^^^^^^ help: try this: `or_insert_with(|| vec![])`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::or_fun_call)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#or_fun_call
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a BTreeMap. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/interpreter.rs:315:24
[INFO] [stderr]     |
[INFO] [stderr] 315 |                     Ok(self.locals.get(index).unwrap().clone())
[INFO] [stderr]     |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.locals[index]`
[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: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/interpreter.rs:335:39
[INFO] [stderr]     |
[INFO] [stderr] 335 |                     let mut it = call.into_iter();
[INFO] [stderr]     |                                       ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/interpreter.rs:350:46
[INFO] [stderr]     |
[INFO] [stderr] 350 |                 for (index, ast) in bindings.into_iter() {
[INFO] [stderr]     |                                              ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/interpreter.rs:356:33
[INFO] [stderr]     |
[INFO] [stderr] 356 |                 for ast in body.into_iter() {
[INFO] [stderr]     |                                 ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/interpreter.rs:360:44
[INFO] [stderr]     |
[INFO] [stderr] 360 |                 for (index, _) in bindings.into_iter() {
[INFO] [stderr]     |                                            ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[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.rs:373:39
[INFO] [stderr]     |
[INFO] [stderr] 373 |     fn create_lambda(&mut self, args: &Vec<u32>, body: &Vec<ASTNode>, closure: &Vec<u32>) -> Box<CallableValue> {
[INFO] [stderr]     |                                       ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] help: change this to
[INFO] [stderr]     |
[INFO] [stderr] 373 |     fn create_lambda(&mut self, args: &[u32], body: &Vec<ASTNode>, closure: &Vec<u32>) -> Box<CallableValue> {
[INFO] [stderr]     |                                       ^^^^^^
[INFO] [stderr] help: change `args.clone()` to
[INFO] [stderr]     |
[INFO] [stderr] 432 |             args: args.to_owned(),
[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/interpreter.rs:373:56
[INFO] [stderr]     |
[INFO] [stderr] 373 |     fn create_lambda(&mut self, args: &Vec<u32>, body: &Vec<ASTNode>, closure: &Vec<u32>) -> Box<CallableValue> {
[INFO] [stderr]     |                                                        ^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] help: change this to
[INFO] [stderr]     |
[INFO] [stderr] 373 |     fn create_lambda(&mut self, args: &Vec<u32>, body: &[ASTNode], closure: &Vec<u32>) -> Box<CallableValue> {
[INFO] [stderr]     |                                                        ^^^^^^^^^^
[INFO] [stderr] help: change `body.clone()` to
[INFO] [stderr]     |
[INFO] [stderr] 433 |             body: body.to_owned(),
[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/interpreter.rs:373:80
[INFO] [stderr]     |
[INFO] [stderr] 373 |     fn create_lambda(&mut self, args: &Vec<u32>, body: &Vec<ASTNode>, closure: &Vec<u32>) -> Box<CallableValue> {
[INFO] [stderr]     |                                                                                ^^^^^^^^^ help: change this to: `&[u32]`
[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: the loop variable `i` is used to index `arg_values`
[INFO] [stderr]    --> src/interpreter.rs:391:26
[INFO] [stderr]     |
[INFO] [stderr] 391 |                 for i in 0..self.args.len() {
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::needless_range_loop)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stderr] help: consider using an iterator
[INFO] [stderr]     |
[INFO] [stderr] 391 |                 for (i, <item>) in arg_values.iter().enumerate().take(self.args.len()) {
[INFO] [stderr]     |                     ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: redundant pattern matching, consider using `is_none()`
[INFO] [stderr]    --> src/interpreter.rs:398:28
[INFO] [stderr]     |
[INFO] [stderr] 398 |                       if let None = interpreter.locals.get(index) {
[INFO] [stderr]     |  _____________________-      ^^^^
[INFO] [stderr] 399 | |                         interpreter.locals.insert(*index, value_ref.clone());
[INFO] [stderr] 400 | |                         injected_closure.push(*index);
[INFO] [stderr] 401 | |                     }
[INFO] [stderr]     | |_____________________- help: try this: `if interpreter.locals.get(index).is_none()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stderr] 
[INFO] [stderr] warning: very complex type used. Consider factoring parts into `type` definitions
[INFO] [stderr]    --> src/interpreter.rs:440:23
[INFO] [stderr]     |
[INFO] [stderr] 440 |             callable: Box<Fn(&mut Interpreter, Vec<ValueRef>) -> Result<ValueRef, String>>,
[INFO] [stderr]     |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::type_complexity)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity
[INFO] [stderr] 
[INFO] [stderr] warning: very complex type used. Consider factoring parts into `type` definitions
[INFO] [stderr]    --> src/interpreter.rs:469:42
[INFO] [stderr]     |
[INFO] [stderr] 469 |         let mut inject = |name: &str, f: Box<Fn(&mut Interpreter, Vec<ValueRef>) -> Result<ValueRef, String>>| {
[INFO] [stderr]     |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.92s
[INFO] running `"docker" "inspect" "4fb966942b484b7698f34e72a48d981f500f7d2e21a6468f04b8c80fd033fb7a"`
[INFO] running `"docker" "rm" "-f" "4fb966942b484b7698f34e72a48d981f500f7d2e21a6468f04b8c80fd033fb7a"`
[INFO] [stdout] 4fb966942b484b7698f34e72a48d981f500f7d2e21a6468f04b8c80fd033fb7a