[INFO] crate helix 0.7.5 is already in cache
[INFO] extracting crate helix 0.7.5 into work/ex/clippy-test-run/sources/stable/reg/helix/0.7.5
[INFO] extracting crate helix 0.7.5 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/helix/0.7.5
[INFO] validating manifest of helix-0.7.5 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 helix-0.7.5 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 helix-0.7.5
[INFO] finished frobbing helix-0.7.5
[INFO] frobbed toml for helix-0.7.5 written to work/ex/clippy-test-run/sources/stable/reg/helix/0.7.5/Cargo.toml
[INFO] started frobbing helix-0.7.5
[INFO] finished frobbing helix-0.7.5
[INFO] frobbed toml for helix-0.7.5 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/helix/0.7.5/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 helix-0.7.5 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-6/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/helix/0.7.5:/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] d2db2cecf81a01622f436e5242405a65896947c5b27ab9ae7247f1ddacaa0559
[INFO] running `"docker" "start" "-a" "d2db2cecf81a01622f436e5242405a65896947c5b27ab9ae7247f1ddacaa0559"`
[INFO] [stderr]    Compiling libcruby-sys v0.7.5
[INFO] [stderr]     Checking helix v0.7.5 (/opt/crater/workdir)
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/class_definition.rs:17:55
[INFO] [stderr]    |
[INFO] [stderr] 17 |         MethodDefinition::Class(MethodSpecification { name: name, function: function, arity: arity })
[INFO] [stderr]    |                                                       ^^^^^^^^^^ help: replace it with: `name`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/class_definition.rs:17:67
[INFO] [stderr]    |
[INFO] [stderr] 17 |         MethodDefinition::Class(MethodSpecification { name: name, function: function, arity: arity })
[INFO] [stderr]    |                                                                   ^^^^^^^^^^^^^^^^^^ help: replace it with: `function`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/class_definition.rs:17:87
[INFO] [stderr]    |
[INFO] [stderr] 17 |         MethodDefinition::Class(MethodSpecification { name: name, function: function, arity: arity })
[INFO] [stderr]    |                                                                                       ^^^^^^^^^^^^ help: replace it with: `arity`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/class_definition.rs:21:58
[INFO] [stderr]    |
[INFO] [stderr] 21 |         MethodDefinition::Instance(MethodSpecification { name: name, function: function, arity: arity })
[INFO] [stderr]    |                                                          ^^^^^^^^^^ help: replace it with: `name`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/class_definition.rs:21:70
[INFO] [stderr]    |
[INFO] [stderr] 21 |         MethodDefinition::Instance(MethodSpecification { name: name, function: function, arity: arity })
[INFO] [stderr]    |                                                                      ^^^^^^^^^^^^^^^^^^ help: replace it with: `function`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/class_definition.rs:21:90
[INFO] [stderr]    |
[INFO] [stderr] 21 |         MethodDefinition::Instance(MethodSpecification { name: name, function: function, arity: arity })
[INFO] [stderr]    |                                                                                          ^^^^^^^^^^^^ help: replace it with: `arity`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/coercions/mod.rs:39:24
[INFO] [stderr]    |
[INFO] [stderr] 39 |         CheckedValue { inner: inner, marker: PhantomData }
[INFO] [stderr]    |                        ^^^^^^^^^^^^ help: replace it with: `inner`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/class_definition.rs:17:55
[INFO] [stderr]    |
[INFO] [stderr] 17 |         MethodDefinition::Class(MethodSpecification { name: name, function: function, arity: arity })
[INFO] [stderr]    |                                                       ^^^^^^^^^^ help: replace it with: `name`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/class_definition.rs:17:67
[INFO] [stderr]    |
[INFO] [stderr] 17 |         MethodDefinition::Class(MethodSpecification { name: name, function: function, arity: arity })
[INFO] [stderr]    |                                                                   ^^^^^^^^^^^^^^^^^^ help: replace it with: `function`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/class_definition.rs:17:87
[INFO] [stderr]    |
[INFO] [stderr] 17 |         MethodDefinition::Class(MethodSpecification { name: name, function: function, arity: arity })
[INFO] [stderr]    |                                                                                       ^^^^^^^^^^^^ help: replace it with: `arity`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/class_definition.rs:21:58
[INFO] [stderr]    |
[INFO] [stderr] 21 |         MethodDefinition::Instance(MethodSpecification { name: name, function: function, arity: arity })
[INFO] [stderr]    |                                                          ^^^^^^^^^^ help: replace it with: `name`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/class_definition.rs:21:70
[INFO] [stderr]    |
[INFO] [stderr] 21 |         MethodDefinition::Instance(MethodSpecification { name: name, function: function, arity: arity })
[INFO] [stderr]    |                                                                      ^^^^^^^^^^^^^^^^^^ help: replace it with: `function`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/class_definition.rs:21:90
[INFO] [stderr]    |
[INFO] [stderr] 21 |         MethodDefinition::Instance(MethodSpecification { name: name, function: function, arity: arity })
[INFO] [stderr]    |                                                                                          ^^^^^^^^^^^^ help: replace it with: `arity`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/coercions/mod.rs:39:24
[INFO] [stderr]    |
[INFO] [stderr] 39 |         CheckedValue { inner: inner, marker: PhantomData }
[INFO] [stderr]    |                        ^^^^^^^^^^^^ help: replace it with: `inner`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded unit return type
[INFO] [stderr]   --> src/coercions/unit.rs:15:34
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn from_checked(checked: ()) -> () {
[INFO] [stderr]    |                                  ^^^^^ help: remove the `-> ()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::unused_unit)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit
[INFO] [stderr] 
[INFO] [stderr] warning: this `else { if .. }` block can be collapsed
[INFO] [stderr]   --> src/coercions/string.rs:18:20
[INFO] [stderr]    |
[INFO] [stderr] 18 |               } else {
[INFO] [stderr]    |  ____________________^
[INFO] [stderr] 19 | |                 if unsafe { sys::rb_str_ascii_only_p(value) } {
[INFO] [stderr] 20 | |                     unsafe { Ok(CheckedValue::new(value)) }
[INFO] [stderr] 21 | |                 } else {
[INFO] [stderr] 22 | |                     type_error!(value, "an UTF-8 String")
[INFO] [stderr] 23 | |                 }
[INFO] [stderr] 24 | |             }
[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] 18 |             } else if unsafe { sys::rb_str_ascii_only_p(value) } {
[INFO] [stderr] 19 |     unsafe { Ok(CheckedValue::new(value)) }
[INFO] [stderr] 20 | } else {
[INFO] [stderr] 21 |     type_error!(value, "an UTF-8 String")
[INFO] [stderr] 22 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded unit return type
[INFO] [stderr]   --> src/coercions/unit.rs:15:34
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn from_checked(checked: ()) -> () {
[INFO] [stderr]    |                                  ^^^^^ help: remove the `-> ()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::unused_unit)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit
[INFO] [stderr] 
[INFO] [stderr] warning: this `else { if .. }` block can be collapsed
[INFO] [stderr]   --> src/coercions/string.rs:18:20
[INFO] [stderr]    |
[INFO] [stderr] 18 |               } else {
[INFO] [stderr]    |  ____________________^
[INFO] [stderr] 19 | |                 if unsafe { sys::rb_str_ascii_only_p(value) } {
[INFO] [stderr] 20 | |                     unsafe { Ok(CheckedValue::new(value)) }
[INFO] [stderr] 21 | |                 } else {
[INFO] [stderr] 22 | |                     type_error!(value, "an UTF-8 String")
[INFO] [stderr] 23 | |                 }
[INFO] [stderr] 24 | |             }
[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] 18 |             } else if unsafe { sys::rb_str_ascii_only_p(value) } {
[INFO] [stderr] 19 |     unsafe { Ok(CheckedValue::new(value)) }
[INFO] [stderr] 20 | } else {
[INFO] [stderr] 21 |     type_error!(value, "an UTF-8 String")
[INFO] [stderr] 22 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: redundant closure found
[INFO] [stderr]   --> src/coercions/option.rs:11:37
[INFO] [stderr]    |
[INFO] [stderr] 11 |             T::from_ruby(value).map(|c| Some(c))
[INFO] [stderr]    |                                     ^^^^^^^^^^^ help: remove closure as shown: `Some`
[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: transmute from a pointer type (`*mut libc::c_void`) to a reference type (`&mut std::vec::Vec<(sys::VALUE, sys::VALUE)>`)
[INFO] [stderr]  --> src/coercions/hash.rs:8:50
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let vec: &mut Vec<(VALUE, VALUE)> = unsafe { transmute(vec) };
[INFO] [stderr]   |                                                  ^^^^^^^^^^^^^^ help: try: `&mut *(vec as *mut std::vec::Vec<(sys::VALUE, sys::VALUE)>)`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::transmute_ptr_to_ref)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#transmute_ptr_to_ref
[INFO] [stderr] 
[INFO] [stderr] warning: impl for `HashMap` should be generalized over different hashers
[INFO] [stderr]   --> src/coercions/hash.rs:13:57
[INFO] [stderr]    |
[INFO] [stderr] 13 | impl<K: FromRuby + Eq + Hash, V: FromRuby> FromRuby for HashMap<K, V> {
[INFO] [stderr]    |                                                         ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::implicit_hasher)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#implicit_hasher
[INFO] [stderr] help: consider adding a type parameter
[INFO] [stderr]    |
[INFO] [stderr] 13 | impl<K: FromRuby + Eq + Hash, V: FromRuby, S: ::std::hash::BuildHasher> FromRuby for HashMap<K, V, S> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^              ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: transmute from a reference to a pointer
[INFO] [stderr]   --> src/coercions/hash.rs:21:62
[INFO] [stderr]    |
[INFO] [stderr] 21 |             unsafe { rb_hash_foreach(value, rb_hash_collect, transmute(&mut pairs)) };
[INFO] [stderr]    |                                                              ^^^^^^^^^^^^^^^^^^^^^ help: try: `&mut pairs as *mut std::vec::Vec<(sys::VALUE, sys::VALUE)> as *mut libc::c_void`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::useless_transmute)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_transmute
[INFO] [stderr] 
[INFO] [stderr] warning: impl for `HashMap` should be generalized over different hashers
[INFO] [stderr]   --> src/coercions/hash.rs:43:51
[INFO] [stderr]    |
[INFO] [stderr] 43 | impl<K: ToRuby + Eq + Hash, V: ToRuby> ToRuby for HashMap<K, V> {
[INFO] [stderr]    |                                                   ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#implicit_hasher
[INFO] [stderr] help: consider adding a type parameter
[INFO] [stderr]    |
[INFO] [stderr] 43 | impl<K: ToRuby + Eq + Hash, V: ToRuby, S: ::std::hash::BuildHasher> ToRuby for HashMap<K, V, S> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: methods called `to_*` usually take self by reference; consider choosing a less ambiguous name
[INFO] [stderr]   --> src/coercions/mod.rs:42:21
[INFO] [stderr]    |
[INFO] [stderr] 42 |     pub fn to_value(self) -> VALUE {
[INFO] [stderr]    |                     ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::wrong_self_convention)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#wrong_self_convention
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/lib.rs:141:21
[INFO] [stderr]     |
[INFO] [stderr] 141 |     pub fn subclass(&self, name: &CStr) -> Class {
[INFO] [stderr]     |                     ^^^^^ help: consider passing by value instead: `self`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::trivially_copy_pass_by_ref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/lib.rs:147:41
[INFO] [stderr]     |
[INFO] [stderr] 147 |     pub fn define_method<T: RubyMethod>(&self, name: &CStr, method: T) {
[INFO] [stderr]     |                                         ^^^^^ help: consider passing by value instead: `self`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: redundant closure found
[INFO] [stderr]   --> src/coercions/option.rs:11:37
[INFO] [stderr]    |
[INFO] [stderr] 11 |             T::from_ruby(value).map(|c| Some(c))
[INFO] [stderr]    |                                     ^^^^^^^^^^^ help: remove closure as shown: `Some`
[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: transmute from a pointer type (`*mut libc::c_void`) to a reference type (`&mut std::vec::Vec<(sys::VALUE, sys::VALUE)>`)
[INFO] [stderr]  --> src/coercions/hash.rs:8:50
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let vec: &mut Vec<(VALUE, VALUE)> = unsafe { transmute(vec) };
[INFO] [stderr]   |                                                  ^^^^^^^^^^^^^^ help: try: `&mut *(vec as *mut std::vec::Vec<(sys::VALUE, sys::VALUE)>)`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::transmute_ptr_to_ref)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#transmute_ptr_to_ref
[INFO] [stderr] 
[INFO] [stderr] warning: impl for `HashMap` should be generalized over different hashers
[INFO] [stderr]   --> src/coercions/hash.rs:13:57
[INFO] [stderr]    |
[INFO] [stderr] 13 | impl<K: FromRuby + Eq + Hash, V: FromRuby> FromRuby for HashMap<K, V> {
[INFO] [stderr]    |                                                         ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::implicit_hasher)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#implicit_hasher
[INFO] [stderr] help: consider adding a type parameter
[INFO] [stderr]    |
[INFO] [stderr] 13 | impl<K: FromRuby + Eq + Hash, V: FromRuby, S: ::std::hash::BuildHasher> FromRuby for HashMap<K, V, S> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^              ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: transmute from a reference to a pointer
[INFO] [stderr]   --> src/coercions/hash.rs:21:62
[INFO] [stderr]    |
[INFO] [stderr] 21 |             unsafe { rb_hash_foreach(value, rb_hash_collect, transmute(&mut pairs)) };
[INFO] [stderr]    |                                                              ^^^^^^^^^^^^^^^^^^^^^ help: try: `&mut pairs as *mut std::vec::Vec<(sys::VALUE, sys::VALUE)> as *mut libc::c_void`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::useless_transmute)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_transmute
[INFO] [stderr] 
[INFO] [stderr] warning: impl for `HashMap` should be generalized over different hashers
[INFO] [stderr]   --> src/coercions/hash.rs:43:51
[INFO] [stderr]    |
[INFO] [stderr] 43 | impl<K: ToRuby + Eq + Hash, V: ToRuby> ToRuby for HashMap<K, V> {
[INFO] [stderr]    |                                                   ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#implicit_hasher
[INFO] [stderr] help: consider adding a type parameter
[INFO] [stderr]    |
[INFO] [stderr] 43 | impl<K: ToRuby + Eq + Hash, V: ToRuby, S: ::std::hash::BuildHasher> ToRuby for HashMap<K, V, S> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: methods called `to_*` usually take self by reference; consider choosing a less ambiguous name
[INFO] [stderr]   --> src/coercions/mod.rs:42:21
[INFO] [stderr]    |
[INFO] [stderr] 42 |     pub fn to_value(self) -> VALUE {
[INFO] [stderr]    |                     ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::wrong_self_convention)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#wrong_self_convention
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/lib.rs:141:21
[INFO] [stderr]     |
[INFO] [stderr] 141 |     pub fn subclass(&self, name: &CStr) -> Class {
[INFO] [stderr]     |                     ^^^^^ help: consider passing by value instead: `self`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::trivially_copy_pass_by_ref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/lib.rs:147:41
[INFO] [stderr]     |
[INFO] [stderr] 147 |     pub fn define_method<T: RubyMethod>(&self, name: &CStr, method: T) {
[INFO] [stderr]     |                                         ^^^^^ help: consider passing by value instead: `self`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.81s
[INFO] running `"docker" "inspect" "d2db2cecf81a01622f436e5242405a65896947c5b27ab9ae7247f1ddacaa0559"`
[INFO] running `"docker" "rm" "-f" "d2db2cecf81a01622f436e5242405a65896947c5b27ab9ae7247f1ddacaa0559"`
[INFO] [stdout] d2db2cecf81a01622f436e5242405a65896947c5b27ab9ae7247f1ddacaa0559