[INFO] updating cached repository safsom/alif
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/safsom/alif
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/safsom/alif" "work/ex/clippy-test-run/sources/stable/gh/safsom/alif"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/safsom/alif'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/safsom/alif" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/safsom/alif"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/safsom/alif'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 786504c115ca9a5325867a2ff8f9bc87e59afba3
[INFO] sha for GitHub repo safsom/alif: 786504c115ca9a5325867a2ff8f9bc87e59afba3
[INFO] validating manifest of safsom/alif 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 safsom/alif 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 safsom/alif
[INFO] finished frobbing safsom/alif
[INFO] frobbed toml for safsom/alif written to work/ex/clippy-test-run/sources/stable/gh/safsom/alif/Cargo.toml
[INFO] started frobbing safsom/alif
[INFO] finished frobbing safsom/alif
[INFO] frobbed toml for safsom/alif written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/safsom/alif/Cargo.toml
[INFO] crate safsom/alif 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 safsom/alif 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-4/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/safsom/alif:/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] 6a446d8cb0594d3354c068763653ff0b359b37cd0d3bf553d023e166c885ca18
[INFO] running `"docker" "start" "-a" "6a446d8cb0594d3354c068763653ff0b359b37cd0d3bf553d023e166c885ca18"`
[INFO] [stderr]     Checking ac v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: literal with an empty format string
[INFO] [stderr]    --> src/lexer.rs:218:80
[INFO] [stderr]     |
[INFO] [stderr] 218 |             TokenType::OpenCurly => println!("token {} at char {} on line {}", "{", token.token_pos, token.token_line),
[INFO] [stderr]     |                                                                                ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::print_literal)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_literal
[INFO] [stderr] 
[INFO] [stderr] warning: literal with an empty format string
[INFO] [stderr]    --> src/lexer.rs:219:82
[INFO] [stderr]     |
[INFO] [stderr] 219 |             TokenType::ClosedCurly => println!("token {} at char {} on line {}", "}", token.token_pos, token.token_line),
[INFO] [stderr]     |                                                                                  ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_literal
[INFO] [stderr] 
[INFO] [stderr] warning: literal with an empty format string
[INFO] [stderr]    --> src/lexer.rs:230:81
[INFO] [stderr]     |
[INFO] [stderr] 230 |             TokenType::OpenSquare => println!("token {} at char {} on line {}", "[", token.token_line, token.token_pos),
[INFO] [stderr]     |                                                                                 ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_literal
[INFO] [stderr] 
[INFO] [stderr] warning: literal with an empty format string
[INFO] [stderr]    --> src/lexer.rs:231:83
[INFO] [stderr]     |
[INFO] [stderr] 231 |             TokenType::ClosedSquare => println!("token {} at char {} on line {}", "]", token.token_line, token.token_pos),
[INFO] [stderr]     |                                                                                   ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_literal
[INFO] [stderr] 
[INFO] [stderr] warning: literal with an empty format string
[INFO] [stderr]    --> src/lexer.rs:218:80
[INFO] [stderr]     |
[INFO] [stderr] 218 |             TokenType::OpenCurly => println!("token {} at char {} on line {}", "{", token.token_pos, token.token_line),
[INFO] [stderr]     |                                                                                ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::print_literal)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_literal
[INFO] [stderr] 
[INFO] [stderr] warning: literal with an empty format string
[INFO] [stderr]    --> src/lexer.rs:219:82
[INFO] [stderr]     |
[INFO] [stderr] 219 |             TokenType::ClosedCurly => println!("token {} at char {} on line {}", "}", token.token_pos, token.token_line),
[INFO] [stderr]     |                                                                                  ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_literal
[INFO] [stderr] 
[INFO] [stderr] warning: literal with an empty format string
[INFO] [stderr]    --> src/lexer.rs:230:81
[INFO] [stderr]     |
[INFO] [stderr] 230 |             TokenType::OpenSquare => println!("token {} at char {} on line {}", "[", token.token_line, token.token_pos),
[INFO] [stderr]     |                                                                                 ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_literal
[INFO] [stderr] 
[INFO] [stderr] warning: literal with an empty format string
[INFO] [stderr]    --> src/lexer.rs:231:83
[INFO] [stderr]     |
[INFO] [stderr] 231 |             TokenType::ClosedSquare => println!("token {} at char {} on line {}", "]", token.token_line, token.token_pos),
[INFO] [stderr]     |                                                                                   ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_literal
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]    --> src/lexer.rs:229:46
[INFO] [stderr]     |
[INFO] [stderr] 229 |             TokenType::Identifier(ref s, ref b) => println!("identifier {} on line {} at char {}", s, token.token_line, token.token_pos),
[INFO] [stderr]     |                                              ^ help: consider using `_b` instead
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/parser.rs:69:43
[INFO] [stderr]    |
[INFO] [stderr] 69 |                     TokenType::String(ref s) => panic!("error: type mismatch: cannot operate on integers and strings"),
[INFO] [stderr]    |                                           ^ help: consider using `_s` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]    --> src/lexer.rs:229:46
[INFO] [stderr]     |
[INFO] [stderr] 229 |             TokenType::Identifier(ref s, ref b) => println!("identifier {} on line {} at char {}", s, token.token_line, token.token_pos),
[INFO] [stderr]     |                                              ^ help: consider using `_b` instead
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/parser.rs:69:43
[INFO] [stderr]    |
[INFO] [stderr] 69 |                     TokenType::String(ref s) => panic!("error: type mismatch: cannot operate on integers and strings"),
[INFO] [stderr]    |                                           ^ help: consider using `_s` instead
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/parser.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 |     let mut i = 0;
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Division`
[INFO] [stderr]  --> src/parser.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     Division,
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `LeftShift`
[INFO] [stderr]   --> src/parser.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     LeftShift,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `RightShift`
[INFO] [stderr]   --> src/parser.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     RightShift,
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `StringLiteral`
[INFO] [stderr]   --> src/parser.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 28 |     StringLiteral(String),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Character`
[INFO] [stderr]   --> src/parser.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     Character(char),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Const`
[INFO] [stderr]   --> src/parser.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     Const(String, Box<Expression>),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Unary`
[INFO] [stderr]   --> src/parser.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     Unary(Operators, Box<Expression>),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Call`
[INFO] [stderr]   --> src/parser.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     Call(String, Vec<Expression>),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Function`
[INFO] [stderr]   --> src/parser.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |     Function(String, Vec<Expression>, Vec<Expression>),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `If`
[INFO] [stderr]   --> src/parser.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     If(Box<Expression>, Vec<Expression>),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Else`
[INFO] [stderr]   --> src/parser.rs:36:5
[INFO] [stderr]    |
[INFO] [stderr] 36 |     Else(Vec<Expression>),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant `keywords` should have an upper case name such as `KEYWORDS`
[INFO] [stderr]  --> src/lexer.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | const keywords: [&str; 10] = ["const", "record", "char", "string", "int", "bool", "if", "else", "match", "enum"];
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(non_upper_case_globals)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/lexer.rs:61:23
[INFO] [stderr]    |
[INFO] [stderr] 61 | fn is_keyword(string: &String) -> bool {
[INFO] [stderr]    |                       ^^^^^^^ help: change this to: `&str`
[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: the loop variable `i` is only used to index `keywords`.
[INFO] [stderr]   --> src/lexer.rs:62:14
[INFO] [stderr]    |
[INFO] [stderr] 62 |     for i in 0..10 {
[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] 62 |     for <item> in &keywords {
[INFO] [stderr]    |         ^^^^^^    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]   --> src/lexer.rs:63:12
[INFO] [stderr]    |
[INFO] [stderr] 63 |         if keywords[i].to_string() == *string {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ try implementing the comparison without allocating
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::cmp_owned)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/parser.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 |     let mut i = 0;
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Division`
[INFO] [stderr]  --> src/parser.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     Division,
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `LeftShift`
[INFO] [stderr]   --> src/parser.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     LeftShift,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `RightShift`
[INFO] [stderr]   --> src/parser.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     RightShift,
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `StringLiteral`
[INFO] [stderr]   --> src/parser.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 28 |     StringLiteral(String),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Character`
[INFO] [stderr]   --> src/parser.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     Character(char),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Const`
[INFO] [stderr]   --> src/parser.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     Const(String, Box<Expression>),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Unary`
[INFO] [stderr]   --> src/parser.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     Unary(Operators, Box<Expression>),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Call`
[INFO] [stderr]   --> src/parser.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     Call(String, Vec<Expression>),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Function`
[INFO] [stderr]   --> src/parser.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |     Function(String, Vec<Expression>, Vec<Expression>),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `If`
[INFO] [stderr]   --> src/parser.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     If(Box<Expression>, Vec<Expression>),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Else`
[INFO] [stderr]   --> src/parser.rs:36:5
[INFO] [stderr]    |
[INFO] [stderr] 36 |     Else(Vec<Expression>),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant `keywords` should have an upper case name such as `KEYWORDS`
[INFO] [stderr]  --> src/lexer.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | const keywords: [&str; 10] = ["const", "record", "char", "string", "int", "bool", "if", "else", "match", "enum"];
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(non_upper_case_globals)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/lexer.rs:61:23
[INFO] [stderr]    |
[INFO] [stderr] 61 | fn is_keyword(string: &String) -> bool {
[INFO] [stderr]    |                       ^^^^^^^ help: change this to: `&str`
[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: the loop variable `i` is only used to index `keywords`.
[INFO] [stderr]   --> src/lexer.rs:62:14
[INFO] [stderr]    |
[INFO] [stderr] 62 |     for i in 0..10 {
[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] 62 |     for <item> in &keywords {
[INFO] [stderr]    |         ^^^^^^    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]   --> src/lexer.rs:63:12
[INFO] [stderr]    |
[INFO] [stderr] 63 |         if keywords[i].to_string() == *string {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ try implementing the comparison without allocating
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::cmp_owned)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[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/parser.rs:64:9
[INFO] [stderr]    |
[INFO] [stderr] 64 | /         match tokens[i].token_type {
[INFO] [stderr] 65 | |             TokenType::Integer(ref lvalue) => {
[INFO] [stderr] 66 | |                 let option = match_operator(&tokens[i + 1].token_type);
[INFO] [stderr] 67 | |                 let rvalue = match tokens[i + 2].token_type {
[INFO] [stderr] ...  |
[INFO] [stderr] 75 | |             _ => (),
[INFO] [stderr] 76 | |         }
[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] 64 |         if let TokenType::Integer(ref lvalue) = tokens[i].token_type {
[INFO] [stderr] 65 |     let option = match_operator(&tokens[i + 1].token_type);
[INFO] [stderr] 66 |     let rvalue = match tokens[i + 2].token_type {
[INFO] [stderr] 67 |         TokenType::Integer(ref n) => *n,
[INFO] [stderr] 68 |         TokenType::String(ref s) => panic!("error: type mismatch: cannot operate on integers and strings"),
[INFO] [stderr] 69 |         _ => 0,
[INFO] [stderr]  ...
[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/parser.rs:64:9
[INFO] [stderr]    |
[INFO] [stderr] 64 | /         match tokens[i].token_type {
[INFO] [stderr] 65 | |             TokenType::Integer(ref lvalue) => {
[INFO] [stderr] 66 | |                 let option = match_operator(&tokens[i + 1].token_type);
[INFO] [stderr] 67 | |                 let rvalue = match tokens[i + 2].token_type {
[INFO] [stderr] ...  |
[INFO] [stderr] 75 | |             _ => (),
[INFO] [stderr] 76 | |         }
[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] 64 |         if let TokenType::Integer(ref lvalue) = tokens[i].token_type {
[INFO] [stderr] 65 |     let option = match_operator(&tokens[i + 1].token_type);
[INFO] [stderr] 66 |     let rvalue = match tokens[i + 2].token_type {
[INFO] [stderr] 67 |         TokenType::Integer(ref n) => *n,
[INFO] [stderr] 68 |         TokenType::String(ref s) => panic!("error: type mismatch: cannot operate on integers and strings"),
[INFO] [stderr] 69 |         _ => 0,
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.55s
[INFO] running `"docker" "inspect" "6a446d8cb0594d3354c068763653ff0b359b37cd0d3bf553d023e166c885ca18"`
[INFO] running `"docker" "rm" "-f" "6a446d8cb0594d3354c068763653ff0b359b37cd0d3bf553d023e166c885ca18"`
[INFO] [stdout] 6a446d8cb0594d3354c068763653ff0b359b37cd0d3bf553d023e166c885ca18