[INFO] crate json_reader 0.1.0 is already in cache
[INFO] extracting crate json_reader 0.1.0 into work/ex/clippy-test-run/sources/stable/reg/json_reader/0.1.0
[INFO] extracting crate json_reader 0.1.0 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/json_reader/0.1.0
[INFO] validating manifest of json_reader-0.1.0 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 json_reader-0.1.0 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 json_reader-0.1.0
[INFO] finished frobbing json_reader-0.1.0
[INFO] frobbed toml for json_reader-0.1.0 written to work/ex/clippy-test-run/sources/stable/reg/json_reader/0.1.0/Cargo.toml
[INFO] started frobbing json_reader-0.1.0
[INFO] finished frobbing json_reader-0.1.0
[INFO] frobbed toml for json_reader-0.1.0 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/json_reader/0.1.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 json_reader-0.1.0 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-3/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/reg/json_reader/0.1.0:/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] 2b18107aaffa109dd8cc55e9d50dc9c956dc7efb7069af09fd123bf408833abe
[INFO] running `"docker" "start" "-a" "2b18107aaffa109dd8cc55e9d50dc9c956dc7efb7069af09fd123bf408833abe"`
[INFO] [stderr]     Checking json_reader v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: this `else { if .. }` block can be collapsed
[INFO] [stderr]    --> src/token.rs:136:28
[INFO] [stderr]     |
[INFO] [stderr] 136 |                       } else {
[INFO] [stderr]     |  ____________________________^
[INFO] [stderr] 137 | |                         if byte == ESCAPE_CHAR {
[INFO] [stderr] 138 | |                             escape = true;
[INFO] [stderr] 139 | |                         } else if byte == CHAR_DOUBLE_QUOTE {
[INFO] [stderr] ...   |
[INFO] [stderr] 143 | |                         }
[INFO] [stderr] 144 | |                     }
[INFO] [stderr]     | |_____________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::collapsible_if)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 136 |                     } else if byte == ESCAPE_CHAR {
[INFO] [stderr] 137 |     escape = true;
[INFO] [stderr] 138 | } else if byte == CHAR_DOUBLE_QUOTE {
[INFO] [stderr] 139 |     done = true;
[INFO] [stderr] 140 | } else {
[INFO] [stderr] 141 |     result_string.push(byte);
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: this `else { if .. }` block can be collapsed
[INFO] [stderr]    --> src/token.rs:136:28
[INFO] [stderr]     |
[INFO] [stderr] 136 |                       } else {
[INFO] [stderr]     |  ____________________________^
[INFO] [stderr] 137 | |                         if byte == ESCAPE_CHAR {
[INFO] [stderr] 138 | |                             escape = true;
[INFO] [stderr] 139 | |                         } else if byte == CHAR_DOUBLE_QUOTE {
[INFO] [stderr] ...   |
[INFO] [stderr] 143 | |                         }
[INFO] [stderr] 144 | |                     }
[INFO] [stderr]     | |_____________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::collapsible_if)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 136 |                     } else if byte == ESCAPE_CHAR {
[INFO] [stderr] 137 |     escape = true;
[INFO] [stderr] 138 | } else if byte == CHAR_DOUBLE_QUOTE {
[INFO] [stderr] 139 |     done = true;
[INFO] [stderr] 140 | } else {
[INFO] [stderr] 141 |     result_string.push(byte);
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/token.rs:5:16
[INFO] [stderr]   |
[INFO] [stderr] 5 | const LF: u8 = '\n' as u8;
[INFO] [stderr]   |                ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::char_lit_as_u8)] on by default
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b'\n'
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/token.rs:6:16
[INFO] [stderr]   |
[INFO] [stderr] 6 | const CR: u8 = '\r' as u8;
[INFO] [stderr]   |                ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b'\r'
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/token.rs:7:19
[INFO] [stderr]   |
[INFO] [stderr] 7 | const SPACE: u8 = ' ' as u8;
[INFO] [stderr]   |                   ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b' '
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/token.rs:8:17
[INFO] [stderr]   |
[INFO] [stderr] 8 | const TAB: u8 = '\t' as u8;
[INFO] [stderr]   |                 ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b'\t'
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/token.rs:9:19
[INFO] [stderr]   |
[INFO] [stderr] 9 | const COMMA: u8 = ',' as u8;
[INFO] [stderr]   |                   ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b','
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:10:17
[INFO] [stderr]    |
[INFO] [stderr] 10 | const DOT: u8 = '.' as u8;
[INFO] [stderr]    |                 ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'.'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:11:19
[INFO] [stderr]    |
[INFO] [stderr] 11 | const MINUS: u8 = '-' as u8;
[INFO] [stderr]    |                   ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'-'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:12:24
[INFO] [stderr]    |
[INFO] [stderr] 12 | const ARRAY_OPEN: u8 = '[' as u8;
[INFO] [stderr]    |                        ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'['
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:13:25
[INFO] [stderr]    |
[INFO] [stderr] 13 | const ARRAY_CLOSE: u8 = ']' as u8;
[INFO] [stderr]    |                         ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b']'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:14:25
[INFO] [stderr]    |
[INFO] [stderr] 14 | const OBJECT_OPEN: u8 = '{' as u8;
[INFO] [stderr]    |                         ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'{'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:15:26
[INFO] [stderr]    |
[INFO] [stderr] 15 | const OBJECT_CLOSE: u8 = '}' as u8;
[INFO] [stderr]    |                          ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'}'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:16:21
[INFO] [stderr]    |
[INFO] [stderr] 16 | const NUMBER0: u8 = '0' as u8;
[INFO] [stderr]    |                     ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'0'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:17:21
[INFO] [stderr]    |
[INFO] [stderr] 17 | const NUMBER9: u8 = '9' as u8;
[INFO] [stderr]    |                     ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'9'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:18:25
[INFO] [stderr]    |
[INFO] [stderr] 18 | const ESCAPE_CHAR: u8 = '\\' as u8;
[INFO] [stderr]    |                         ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'\\'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:19:20
[INFO] [stderr]    |
[INFO] [stderr] 19 | const CHAR_N: u8 = 'n' as u8;
[INFO] [stderr]    |                    ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'n'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:20:20
[INFO] [stderr]    |
[INFO] [stderr] 20 | const CHAR_T: u8 = 't' as u8;
[INFO] [stderr]    |                    ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b't'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:21:20
[INFO] [stderr]    |
[INFO] [stderr] 21 | const CHAR_R: u8 = 'r' as u8;
[INFO] [stderr]    |                    ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'r'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:22:20
[INFO] [stderr]    |
[INFO] [stderr] 22 | const CHAR_F: u8 = 'f' as u8;
[INFO] [stderr]    |                    ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'f'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:23:31
[INFO] [stderr]    |
[INFO] [stderr] 23 | const CHAR_DOUBLE_QUOTE: u8 = '"' as u8;
[INFO] [stderr]    |                               ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'"'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: this if-then-else expression returns a bool literal
[INFO] [stderr]    --> src/token.rs:168:24
[INFO] [stderr]     |
[INFO] [stderr] 168 |                   } else if *c >= NUMBER0 && *c <= NUMBER9 {
[INFO] [stderr]     |  ________________________^
[INFO] [stderr] 169 | |                     true
[INFO] [stderr] 170 | |                 } else {
[INFO] [stderr] 171 | |                     false
[INFO] [stderr] 172 | |                 }
[INFO] [stderr]     | |_________________^ help: you can reduce it to: `*c >= NUMBER0 && *c <= NUMBER9`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::needless_bool)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_bool
[INFO] [stderr] 
[INFO] [stderr] warning: redundant closure found
[INFO] [stderr]    --> src/token.rs:222:63
[INFO] [stderr]     |
[INFO] [stderr] 222 |                         let key = Some(self.read_string().map(|f| JsonToken::Key(f)));
[INFO] [stderr]     |                                                               ^^^^^^^^^^^^^^^^^^^^^ help: remove closure as shown: `JsonToken::Key`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::redundant_closure)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
[INFO] [stderr] 
[INFO] [stderr] warning: redundant closure found
[INFO] [stderr]    --> src/token.rs:252:53
[INFO] [stderr]     |
[INFO] [stderr] 252 |                         Some(self.read_string().map(|f| JsonToken::String(f)))
[INFO] [stderr]     |                                                     ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove closure as shown: `JsonToken::String`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
[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/token.rs:270:25
[INFO] [stderr]     |
[INFO] [stderr] 270 | /                         match self.read_const("null") {
[INFO] [stderr] 271 | |                             Err(e) => return Some(Err(e)),
[INFO] [stderr] 272 | |                             Ok(_) => {}
[INFO] [stderr] 273 | |                         };
[INFO] [stderr]     | |_________________________^ help: try this: `if let Err(e) = self.read_const("null") { return Some(Err(e)) }`
[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] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> src/token.rs:279:25
[INFO] [stderr]     |
[INFO] [stderr] 279 | /                         match self.read_const("true") {
[INFO] [stderr] 280 | |                             Err(e) => return Some(Err(e)),
[INFO] [stderr] 281 | |                             Ok(_) => {}
[INFO] [stderr] 282 | |                         };
[INFO] [stderr]     | |_________________________^ help: try this: `if let Err(e) = self.read_const("true") { return Some(Err(e)) }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[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/token.rs:288:25
[INFO] [stderr]     |
[INFO] [stderr] 288 | /                         match self.read_const("false") {
[INFO] [stderr] 289 | |                             Err(e) => return Some(Err(e)),
[INFO] [stderr] 290 | |                             Ok(_) => {}
[INFO] [stderr] 291 | |                         };
[INFO] [stderr]     | |_________________________^ help: try this: `if let Err(e) = self.read_const("false") { return Some(Err(e)) }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] 
[INFO] [stderr] warning: redundant closure found
[INFO] [stderr]    --> src/token.rs:300:57
[INFO] [stderr]     |
[INFO] [stderr] 300 |                         Some(self.read_number(byte).map(|f| JsonToken::Number(f)))
[INFO] [stderr]     |                                                         ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove closure as shown: `JsonToken::Number`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
[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/token.rs:311:13
[INFO] [stderr]     |
[INFO] [stderr] 311 | /             match *(self.container.last().unwrap()) {
[INFO] [stderr] 312 | |                 Container::Object => {
[INFO] [stderr] 313 | |                     self.next_key = true;
[INFO] [stderr] 314 | |                 }
[INFO] [stderr] 315 | |                 _ => {}
[INFO] [stderr] 316 | |             }
[INFO] [stderr]     | |_____________^
[INFO] [stderr]     |
[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] 311 |             if let Container::Object = *(self.container.last().unwrap()) {
[INFO] [stderr] 312 |     self.next_key = true;
[INFO] [stderr] 313 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/level.rs:4:25
[INFO] [stderr]   |
[INFO] [stderr] 4 | const ESCAPE_CHAR: u8 = '\\' as u8;
[INFO] [stderr]   |                         ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b'\\'
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/level.rs:5:31
[INFO] [stderr]   |
[INFO] [stderr] 5 | const CHAR_DOUBLE_QUOTE: u8 = '"' as u8;
[INFO] [stderr]   |                               ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b'"'
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/level.rs:6:24
[INFO] [stderr]   |
[INFO] [stderr] 6 | const ARRAY_OPEN: u8 = '[' as u8;
[INFO] [stderr]   |                        ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b'['
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/level.rs:7:25
[INFO] [stderr]   |
[INFO] [stderr] 7 | const ARRAY_CLOSE: u8 = ']' as u8;
[INFO] [stderr]   |                         ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b']'
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/level.rs:8:25
[INFO] [stderr]   |
[INFO] [stderr] 8 | const OBJECT_OPEN: u8 = '{' as u8;
[INFO] [stderr]   |                         ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b'{'
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/level.rs:9:26
[INFO] [stderr]   |
[INFO] [stderr] 9 | const OBJECT_CLOSE: u8 = '}' as u8;
[INFO] [stderr]   |                          ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b'}'
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: this boolean expression can be simplified
[INFO] [stderr]   --> src/level.rs:28:15
[INFO] [stderr]    |
[INFO] [stderr] 28 |         while !next_char_result.is_none() && (pre || self.level > self.target_level) {
[INFO] [stderr]    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `next_char_result.is_some() && (pre || self.level > self.target_level)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::nonminimal_bool)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/token.rs:5:16
[INFO] [stderr]   |
[INFO] [stderr] 5 | const LF: u8 = '\n' as u8;
[INFO] [stderr]   |                ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::char_lit_as_u8)] on by default
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b'\n'
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/token.rs:6:16
[INFO] [stderr]   |
[INFO] [stderr] 6 | const CR: u8 = '\r' as u8;
[INFO] [stderr]   |                ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b'\r'
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/token.rs:7:19
[INFO] [stderr]   |
[INFO] [stderr] 7 | const SPACE: u8 = ' ' as u8;
[INFO] [stderr]   |                   ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b' '
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/token.rs:8:17
[INFO] [stderr]   |
[INFO] [stderr] 8 | const TAB: u8 = '\t' as u8;
[INFO] [stderr]   |                 ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b'\t'
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/token.rs:9:19
[INFO] [stderr]   |
[INFO] [stderr] 9 | const COMMA: u8 = ',' as u8;
[INFO] [stderr]   |                   ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b','
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:10:17
[INFO] [stderr]    |
[INFO] [stderr] 10 | const DOT: u8 = '.' as u8;
[INFO] [stderr]    |                 ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'.'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:11:19
[INFO] [stderr]    |
[INFO] [stderr] 11 | const MINUS: u8 = '-' as u8;
[INFO] [stderr]    |                   ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'-'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:12:24
[INFO] [stderr]    |
[INFO] [stderr] 12 | const ARRAY_OPEN: u8 = '[' as u8;
[INFO] [stderr]    |                        ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'['
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:13:25
[INFO] [stderr]    |
[INFO] [stderr] 13 | const ARRAY_CLOSE: u8 = ']' as u8;
[INFO] [stderr]    |                         ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b']'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:14:25
[INFO] [stderr]    |
[INFO] [stderr] 14 | const OBJECT_OPEN: u8 = '{' as u8;
[INFO] [stderr]    |                         ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'{'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:15:26
[INFO] [stderr]    |
[INFO] [stderr] 15 | const OBJECT_CLOSE: u8 = '}' as u8;
[INFO] [stderr]    |                          ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'}'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:16:21
[INFO] [stderr]    |
[INFO] [stderr] 16 | const NUMBER0: u8 = '0' as u8;
[INFO] [stderr]    |                     ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'0'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:17:21
[INFO] [stderr]    |
[INFO] [stderr] 17 | const NUMBER9: u8 = '9' as u8;
[INFO] [stderr]    |                     ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'9'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:18:25
[INFO] [stderr]    |
[INFO] [stderr] 18 | const ESCAPE_CHAR: u8 = '\\' as u8;
[INFO] [stderr]    |                         ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'\\'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:19:20
[INFO] [stderr]    |
[INFO] [stderr] 19 | const CHAR_N: u8 = 'n' as u8;
[INFO] [stderr]    |                    ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'n'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:20:20
[INFO] [stderr]    |
[INFO] [stderr] 20 | const CHAR_T: u8 = 't' as u8;
[INFO] [stderr]    |                    ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b't'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:21:20
[INFO] [stderr]    |
[INFO] [stderr] 21 | const CHAR_R: u8 = 'r' as u8;
[INFO] [stderr]    |                    ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'r'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:22:20
[INFO] [stderr]    |
[INFO] [stderr] 22 | const CHAR_F: u8 = 'f' as u8;
[INFO] [stderr]    |                    ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'f'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/token.rs:23:31
[INFO] [stderr]    |
[INFO] [stderr] 23 | const CHAR_DOUBLE_QUOTE: u8 = '"' as u8;
[INFO] [stderr]    |                               ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'"'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: this if-then-else expression returns a bool literal
[INFO] [stderr]    --> src/token.rs:168:24
[INFO] [stderr]     |
[INFO] [stderr] 168 |                   } else if *c >= NUMBER0 && *c <= NUMBER9 {
[INFO] [stderr]     |  ________________________^
[INFO] [stderr] 169 | |                     true
[INFO] [stderr] 170 | |                 } else {
[INFO] [stderr] 171 | |                     false
[INFO] [stderr] 172 | |                 }
[INFO] [stderr]     | |_________________^ help: you can reduce it to: `*c >= NUMBER0 && *c <= NUMBER9`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::needless_bool)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_bool
[INFO] [stderr] 
[INFO] [stderr] warning: redundant closure found
[INFO] [stderr]    --> src/token.rs:222:63
[INFO] [stderr]     |
[INFO] [stderr] 222 |                         let key = Some(self.read_string().map(|f| JsonToken::Key(f)));
[INFO] [stderr]     |                                                               ^^^^^^^^^^^^^^^^^^^^^ help: remove closure as shown: `JsonToken::Key`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::redundant_closure)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
[INFO] [stderr] 
[INFO] [stderr] warning: redundant closure found
[INFO] [stderr]    --> src/token.rs:252:53
[INFO] [stderr]     |
[INFO] [stderr] 252 |                         Some(self.read_string().map(|f| JsonToken::String(f)))
[INFO] [stderr]     |                                                     ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove closure as shown: `JsonToken::String`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
[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/token.rs:270:25
[INFO] [stderr]     |
[INFO] [stderr] 270 | /                         match self.read_const("null") {
[INFO] [stderr] 271 | |                             Err(e) => return Some(Err(e)),
[INFO] [stderr] 272 | |                             Ok(_) => {}
[INFO] [stderr] 273 | |                         };
[INFO] [stderr]     | |_________________________^ help: try this: `if let Err(e) = self.read_const("null") { return Some(Err(e)) }`
[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] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> src/token.rs:279:25
[INFO] [stderr]     |
[INFO] [stderr] 279 | /                         match self.read_const("true") {
[INFO] [stderr] 280 | |                             Err(e) => return Some(Err(e)),
[INFO] [stderr] 281 | |                             Ok(_) => {}
[INFO] [stderr] 282 | |                         };
[INFO] [stderr]     | |_________________________^ help: try this: `if let Err(e) = self.read_const("true") { return Some(Err(e)) }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[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/token.rs:288:25
[INFO] [stderr]     |
[INFO] [stderr] 288 | /                         match self.read_const("false") {
[INFO] [stderr] 289 | |                             Err(e) => return Some(Err(e)),
[INFO] [stderr] 290 | |                             Ok(_) => {}
[INFO] [stderr] 291 | |                         };
[INFO] [stderr]     | |_________________________^ help: try this: `if let Err(e) = self.read_const("false") { return Some(Err(e)) }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] 
[INFO] [stderr] warning: redundant closure found
[INFO] [stderr]    --> src/token.rs:300:57
[INFO] [stderr]     |
[INFO] [stderr] 300 |                         Some(self.read_number(byte).map(|f| JsonToken::Number(f)))
[INFO] [stderr]     |                                                         ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove closure as shown: `JsonToken::Number`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
[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/token.rs:311:13
[INFO] [stderr]     |
[INFO] [stderr] 311 | /             match *(self.container.last().unwrap()) {
[INFO] [stderr] 312 | |                 Container::Object => {
[INFO] [stderr] 313 | |                     self.next_key = true;
[INFO] [stderr] 314 | |                 }
[INFO] [stderr] 315 | |                 _ => {}
[INFO] [stderr] 316 | |             }
[INFO] [stderr]     | |_____________^
[INFO] [stderr]     |
[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] 311 |             if let Container::Object = *(self.container.last().unwrap()) {
[INFO] [stderr] 312 |     self.next_key = true;
[INFO] [stderr] 313 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/level.rs:4:25
[INFO] [stderr]   |
[INFO] [stderr] 4 | const ESCAPE_CHAR: u8 = '\\' as u8;
[INFO] [stderr]   |                         ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b'\\'
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/level.rs:5:31
[INFO] [stderr]   |
[INFO] [stderr] 5 | const CHAR_DOUBLE_QUOTE: u8 = '"' as u8;
[INFO] [stderr]   |                               ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b'"'
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/level.rs:6:24
[INFO] [stderr]   |
[INFO] [stderr] 6 | const ARRAY_OPEN: u8 = '[' as u8;
[INFO] [stderr]   |                        ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b'['
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/level.rs:7:25
[INFO] [stderr]   |
[INFO] [stderr] 7 | const ARRAY_CLOSE: u8 = ']' as u8;
[INFO] [stderr]   |                         ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b']'
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/level.rs:8:25
[INFO] [stderr]   |
[INFO] [stderr] 8 | const OBJECT_OPEN: u8 = '{' as u8;
[INFO] [stderr]   |                         ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b'{'
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]  --> src/level.rs:9:26
[INFO] [stderr]   |
[INFO] [stderr] 9 | const OBJECT_CLOSE: u8 = '}' as u8;
[INFO] [stderr]   |                          ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: Consider using a byte literal instead:
[INFO] [stderr]           b'}'
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: this boolean expression can be simplified
[INFO] [stderr]   --> src/level.rs:28:15
[INFO] [stderr]    |
[INFO] [stderr] 28 |         while !next_char_result.is_none() && (pre || self.level > self.target_level) {
[INFO] [stderr]    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `next_char_result.is_some() && (pre || self.level > self.target_level)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::nonminimal_bool)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stderr] 
[INFO] [stderr] warning: calling `as_bytes()` on a string literal
[INFO] [stderr]   --> tests/level.rs:11:44
[INFO] [stderr]    |
[INFO] [stderr] 11 |     assert_eq!(r.next().unwrap().unwrap(), "{}".as_bytes());
[INFO] [stderr]    |                                            ^^^^^^^^^^^^^^^ help: consider using a byte string literal instead: `b"{}"`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::string_lit_as_bytes)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#string_lit_as_bytes
[INFO] [stderr] 
[INFO] [stderr] warning: calling `as_bytes()` on a string literal
[INFO] [stderr]   --> tests/level.rs:12:44
[INFO] [stderr]    |
[INFO] [stderr] 12 |     assert_eq!(r.next().unwrap().unwrap(), "{}".as_bytes());
[INFO] [stderr]    |                                            ^^^^^^^^^^^^^^^ help: consider using a byte string literal instead: `b"{}"`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#string_lit_as_bytes
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> tests/token.rs:141:5
[INFO] [stderr]     |
[INFO] [stderr] 141 | /     match err {
[INFO] [stderr] 142 | |         Ok(_) => panic!("Got ok, was expecting an error"),
[INFO] [stderr] 143 | |         Err(_) => {}
[INFO] [stderr] 144 | |     }
[INFO] [stderr]     | |_____^ help: try this: `if let Ok(_) = err { panic!("Got ok, was expecting an error") }`
[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] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.03s
[INFO] running `"docker" "inspect" "2b18107aaffa109dd8cc55e9d50dc9c956dc7efb7069af09fd123bf408833abe"`
[INFO] running `"docker" "rm" "-f" "2b18107aaffa109dd8cc55e9d50dc9c956dc7efb7069af09fd123bf408833abe"`
[INFO] [stdout] 2b18107aaffa109dd8cc55e9d50dc9c956dc7efb7069af09fd123bf408833abe