[INFO] updating cached repository creationix/jack.rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/creationix/jack.rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/creationix/jack.rs" "work/ex/clippy-test-run/sources/stable/gh/creationix/jack.rs"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/creationix/jack.rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/creationix/jack.rs" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/creationix/jack.rs"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/creationix/jack.rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] af183e1413c5b6b7e67cefa14d329a35aa7d6ad5
[INFO] sha for GitHub repo creationix/jack.rs: af183e1413c5b6b7e67cefa14d329a35aa7d6ad5
[INFO] validating manifest of creationix/jack.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 creationix/jack.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 creationix/jack.rs
[INFO] finished frobbing creationix/jack.rs
[INFO] frobbed toml for creationix/jack.rs written to work/ex/clippy-test-run/sources/stable/gh/creationix/jack.rs/Cargo.toml
[INFO] started frobbing creationix/jack.rs
[INFO] finished frobbing creationix/jack.rs
[INFO] frobbed toml for creationix/jack.rs written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/creationix/jack.rs/Cargo.toml
[INFO] crate creationix/jack.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 creationix/jack.rs against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-4/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/creationix/jack.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] 45456d368e748dcb2641ab3f18a14030954df18c58824fc37872df4e5fa22be9
[INFO] running `"docker" "start" "-a" "45456d368e748dcb2641ab3f18a14030954df18c58824fc37872df4e5fa22be9"`
[INFO] [stderr]     Checking rusty-jack v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/main.rs:24:10
[INFO] [stderr]    |
[INFO] [stderr] 24 |       try!(match left {
[INFO] [stderr]    |  __________^
[INFO] [stderr] 25 | |         &Code::Op(_) => write!(f, "({})", left),
[INFO] [stderr] 26 | |         _ => write!(f, "{}", left)
[INFO] [stderr] 27 | |     });
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 24 |     try!(match *left {
[INFO] [stderr] 25 |         Code::Op(_) => write!(f, "({})", left),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/main.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 | /     match right {
[INFO] [stderr] 30 | |         &Code::Op(_) => write!(f, "({})", right),
[INFO] [stderr] 31 | |         _ => write!(f, "{}", right)
[INFO] [stderr] 32 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 29 |     match *right {
[INFO] [stderr] 30 |         Code::Op(_) => write!(f, "({})", right),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/main.rs:36:5
[INFO] [stderr]    |
[INFO] [stderr] 36 | /     match num {
[INFO] [stderr] 37 | |         &Code::Integer(n) if n < 0 => write!(f, "-({})", num),
[INFO] [stderr] 38 | |         &Code::Rational(n, _) if n < 0 => write!(f, "-({})", num),
[INFO] [stderr] 39 | |         &Code::Op(_) => write!(f, "-({})", num),
[INFO] [stderr] 40 | |         _ => write!(f, "-{}", num),
[INFO] [stderr] 41 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 36 |     match *num {
[INFO] [stderr] 37 |         Code::Integer(n) if n < 0 => write!(f, "-({})", num),
[INFO] [stderr] 38 |         Code::Rational(n, _) if n < 0 => write!(f, "-({})", num),
[INFO] [stderr] 39 |         Code::Op(_) => write!(f, "-({})", num),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/main.rs:46:9
[INFO] [stderr]    |
[INFO] [stderr] 46 | /         match self {
[INFO] [stderr] 47 | |             &Code::Integer(n) => write!(f, "{}", n),
[INFO] [stderr] 48 | |             &Code::Rational(n, d) => write!(f, "{}/{}", n, d),
[INFO] [stderr] 49 | |             &Code::String(ref s) => write!(f, "'{}'", s),
[INFO] [stderr] ...  |
[INFO] [stderr] 57 | |             }
[INFO] [stderr] 58 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 46 |         match *self {
[INFO] [stderr] 47 |             Code::Integer(n) => write!(f, "{}", n),
[INFO] [stderr] 48 |             Code::Rational(n, d) => write!(f, "{}/{}", n, d),
[INFO] [stderr] 49 |             Code::String(ref s) => write!(f, "'{}'", s),
[INFO] [stderr] 50 |             Code::Op(ref op) => match op {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/main.rs:50:34
[INFO] [stderr]    |
[INFO] [stderr] 50 |               &Code::Op(ref op) => match op {
[INFO] [stderr]    |  __________________________________^
[INFO] [stderr] 51 | |                 &Op::Add(ref left, ref right) => binopfmt(f, left, right, "+"),
[INFO] [stderr] 52 | |                 &Op::Sub(ref left, ref right) => binopfmt(f, left, right, "-"),
[INFO] [stderr] 53 | |                 &Op::Div(ref left, ref right) => binopfmt(f, left, right, "/"),
[INFO] [stderr] ...  |
[INFO] [stderr] 56 | |
[INFO] [stderr] 57 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 50 |             &Code::Op(ref op) => match *op {
[INFO] [stderr] 51 |                 Op::Add(ref left, ref right) => binopfmt(f, left, right, "+"),
[INFO] [stderr] 52 |                 Op::Sub(ref left, ref right) => binopfmt(f, left, right, "-"),
[INFO] [stderr] 53 |                 Op::Div(ref left, ref right) => binopfmt(f, left, right, "/"),
[INFO] [stderr] 54 |                 Op::Mul(ref left, ref right) => binopfmt(f, left, right, "*"),
[INFO] [stderr] 55 |                 Op::Neg(ref num) => negfmt(f, num),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]   --> src/main.rs:76:5
[INFO] [stderr]    |
[INFO] [stderr] 76 |     n = n / g;
[INFO] [stderr]    |     ^^^^^^^^^ help: replace it with: `n /= g`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::assign_op_pattern)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]   --> src/main.rs:77:5
[INFO] [stderr]    |
[INFO] [stderr] 77 |     d = d / g;
[INFO] [stderr]    |     ^^^^^^^^^ help: replace it with: `d /= g`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/main.rs:143:5
[INFO] [stderr]     |
[INFO] [stderr] 143 | /     match num {
[INFO] [stderr] 144 | |         &Code::Integer(a) => Ok(Code::Integer(-a)),
[INFO] [stderr] 145 | |         &Code::Rational(n, d) => Ok(Code::Rational(-n, d)),
[INFO] [stderr] 146 | |         _ => Err("Negate requires a number"),
[INFO] [stderr] 147 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 143 |     match *num {
[INFO] [stderr] 144 |         Code::Integer(a) => Ok(Code::Integer(-a)),
[INFO] [stderr] 145 |         Code::Rational(n, d) => Ok(Code::Rational(-n, d)),
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/main.rs:153:30
[INFO] [stderr]     |
[INFO] [stderr] 153 |           &Code::Op(ref op) => match op {
[INFO] [stderr]     |  ______________________________^
[INFO] [stderr] 154 | |             &Op::Add(ref left, ref right) => add(left, right),
[INFO] [stderr] 155 | |             &Op::Sub(ref left, ref right) => subtract(left, right),
[INFO] [stderr] 156 | |             &Op::Mul(ref left, ref right) => multiply(left, right),
[INFO] [stderr] 157 | |             &Op::Div(ref left, ref right) => divide(left, right),
[INFO] [stderr] 158 | |             &Op::Neg(ref num) => negate(num),
[INFO] [stderr] 159 | |         },
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 153 |         &Code::Op(ref op) => match *op {
[INFO] [stderr] 154 |             Op::Add(ref left, ref right) => add(left, right),
[INFO] [stderr] 155 |             Op::Sub(ref left, ref right) => subtract(left, right),
[INFO] [stderr] 156 |             Op::Mul(ref left, ref right) => multiply(left, right),
[INFO] [stderr] 157 |             Op::Div(ref left, ref right) => divide(left, right),
[INFO] [stderr] 158 |             Op::Neg(ref num) => negate(num),
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/main.rs:24:10
[INFO] [stderr]    |
[INFO] [stderr] 24 |       try!(match left {
[INFO] [stderr]    |  __________^
[INFO] [stderr] 25 | |         &Code::Op(_) => write!(f, "({})", left),
[INFO] [stderr] 26 | |         _ => write!(f, "{}", left)
[INFO] [stderr] 27 | |     });
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 24 |     try!(match *left {
[INFO] [stderr] 25 |         Code::Op(_) => write!(f, "({})", left),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/main.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 | /     match right {
[INFO] [stderr] 30 | |         &Code::Op(_) => write!(f, "({})", right),
[INFO] [stderr] 31 | |         _ => write!(f, "{}", right)
[INFO] [stderr] 32 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 29 |     match *right {
[INFO] [stderr] 30 |         Code::Op(_) => write!(f, "({})", right),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/main.rs:36:5
[INFO] [stderr]    |
[INFO] [stderr] 36 | /     match num {
[INFO] [stderr] 37 | |         &Code::Integer(n) if n < 0 => write!(f, "-({})", num),
[INFO] [stderr] 38 | |         &Code::Rational(n, _) if n < 0 => write!(f, "-({})", num),
[INFO] [stderr] 39 | |         &Code::Op(_) => write!(f, "-({})", num),
[INFO] [stderr] 40 | |         _ => write!(f, "-{}", num),
[INFO] [stderr] 41 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 36 |     match *num {
[INFO] [stderr] 37 |         Code::Integer(n) if n < 0 => write!(f, "-({})", num),
[INFO] [stderr] 38 |         Code::Rational(n, _) if n < 0 => write!(f, "-({})", num),
[INFO] [stderr] 39 |         Code::Op(_) => write!(f, "-({})", num),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/main.rs:46:9
[INFO] [stderr]    |
[INFO] [stderr] 46 | /         match self {
[INFO] [stderr] 47 | |             &Code::Integer(n) => write!(f, "{}", n),
[INFO] [stderr] 48 | |             &Code::Rational(n, d) => write!(f, "{}/{}", n, d),
[INFO] [stderr] 49 | |             &Code::String(ref s) => write!(f, "'{}'", s),
[INFO] [stderr] ...  |
[INFO] [stderr] 57 | |             }
[INFO] [stderr] 58 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 46 |         match *self {
[INFO] [stderr] 47 |             Code::Integer(n) => write!(f, "{}", n),
[INFO] [stderr] 48 |             Code::Rational(n, d) => write!(f, "{}/{}", n, d),
[INFO] [stderr] 49 |             Code::String(ref s) => write!(f, "'{}'", s),
[INFO] [stderr] 50 |             Code::Op(ref op) => match op {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/main.rs:50:34
[INFO] [stderr]    |
[INFO] [stderr] 50 |               &Code::Op(ref op) => match op {
[INFO] [stderr]    |  __________________________________^
[INFO] [stderr] 51 | |                 &Op::Add(ref left, ref right) => binopfmt(f, left, right, "+"),
[INFO] [stderr] 52 | |                 &Op::Sub(ref left, ref right) => binopfmt(f, left, right, "-"),
[INFO] [stderr] 53 | |                 &Op::Div(ref left, ref right) => binopfmt(f, left, right, "/"),
[INFO] [stderr] ...  |
[INFO] [stderr] 56 | |
[INFO] [stderr] 57 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 50 |             &Code::Op(ref op) => match *op {
[INFO] [stderr] 51 |                 Op::Add(ref left, ref right) => binopfmt(f, left, right, "+"),
[INFO] [stderr] 52 |                 Op::Sub(ref left, ref right) => binopfmt(f, left, right, "-"),
[INFO] [stderr] 53 |                 Op::Div(ref left, ref right) => binopfmt(f, left, right, "/"),
[INFO] [stderr] 54 |                 Op::Mul(ref left, ref right) => binopfmt(f, left, right, "*"),
[INFO] [stderr] 55 |                 Op::Neg(ref num) => negfmt(f, num),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]   --> src/main.rs:76:5
[INFO] [stderr]    |
[INFO] [stderr] 76 |     n = n / g;
[INFO] [stderr]    |     ^^^^^^^^^ help: replace it with: `n /= g`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::assign_op_pattern)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]   --> src/main.rs:77:5
[INFO] [stderr]    |
[INFO] [stderr] 77 |     d = d / g;
[INFO] [stderr]    |     ^^^^^^^^^ help: replace it with: `d /= g`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/main.rs:143:5
[INFO] [stderr]     |
[INFO] [stderr] 143 | /     match num {
[INFO] [stderr] 144 | |         &Code::Integer(a) => Ok(Code::Integer(-a)),
[INFO] [stderr] 145 | |         &Code::Rational(n, d) => Ok(Code::Rational(-n, d)),
[INFO] [stderr] 146 | |         _ => Err("Negate requires a number"),
[INFO] [stderr] 147 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 143 |     match *num {
[INFO] [stderr] 144 |         Code::Integer(a) => Ok(Code::Integer(-a)),
[INFO] [stderr] 145 |         Code::Rational(n, d) => Ok(Code::Rational(-n, d)),
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/main.rs:153:30
[INFO] [stderr]     |
[INFO] [stderr] 153 |           &Code::Op(ref op) => match op {
[INFO] [stderr]     |  ______________________________^
[INFO] [stderr] 154 | |             &Op::Add(ref left, ref right) => add(left, right),
[INFO] [stderr] 155 | |             &Op::Sub(ref left, ref right) => subtract(left, right),
[INFO] [stderr] 156 | |             &Op::Mul(ref left, ref right) => multiply(left, right),
[INFO] [stderr] 157 | |             &Op::Div(ref left, ref right) => divide(left, right),
[INFO] [stderr] 158 | |             &Op::Neg(ref num) => negate(num),
[INFO] [stderr] 159 | |         },
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 153 |         &Code::Op(ref op) => match *op {
[INFO] [stderr] 154 |             Op::Add(ref left, ref right) => add(left, right),
[INFO] [stderr] 155 |             Op::Sub(ref left, ref right) => subtract(left, right),
[INFO] [stderr] 156 |             Op::Mul(ref left, ref right) => multiply(left, right),
[INFO] [stderr] 157 |             Op::Div(ref left, ref right) => divide(left, right),
[INFO] [stderr] 158 |             Op::Neg(ref num) => negate(num),
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.76s
[INFO] running `"docker" "inspect" "45456d368e748dcb2641ab3f18a14030954df18c58824fc37872df4e5fa22be9"`
[INFO] running `"docker" "rm" "-f" "45456d368e748dcb2641ab3f18a14030954df18c58824fc37872df4e5fa22be9"`
[INFO] [stdout] 45456d368e748dcb2641ab3f18a14030954df18c58824fc37872df4e5fa22be9