[INFO] crate pyo3-derive-backend 0.5.2 is already in cache
[INFO] extracting crate pyo3-derive-backend 0.5.2 into work/ex/clippy-test-run/sources/stable/reg/pyo3-derive-backend/0.5.2
[INFO] extracting crate pyo3-derive-backend 0.5.2 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/pyo3-derive-backend/0.5.2
[INFO] validating manifest of pyo3-derive-backend-0.5.2 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 pyo3-derive-backend-0.5.2 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 pyo3-derive-backend-0.5.2
[INFO] finished frobbing pyo3-derive-backend-0.5.2
[INFO] frobbed toml for pyo3-derive-backend-0.5.2 written to work/ex/clippy-test-run/sources/stable/reg/pyo3-derive-backend/0.5.2/Cargo.toml
[INFO] started frobbing pyo3-derive-backend-0.5.2
[INFO] finished frobbing pyo3-derive-backend-0.5.2
[INFO] frobbed toml for pyo3-derive-backend-0.5.2 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/pyo3-derive-backend/0.5.2/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 pyo3-derive-backend-0.5.2 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-5/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/pyo3-derive-backend/0.5.2:/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] 833753d2c1d016235723dae6479c6cdb7d4c813159dcbc42e56b98667d7ac3b1
[INFO] running `"docker" "start" "-a" "833753d2c1d016235723dae6479c6cdb7d4c813159dcbc42e56b98667d7ac3b1"`
[INFO] [stderr]     Checking syn v0.15.26
[INFO] [stderr]     Checking pyo3-derive-backend v0.5.2 (/opt/crater/workdir)
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/method.rs:103:25
[INFO] [stderr]     |
[INFO] [stderr] 103 |                         ty: ty,
[INFO] [stderr]     |                         ^^^^^^ help: replace it with: `ty`
[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/method.rs:105:25
[INFO] [stderr]     |
[INFO] [stderr] 105 |                         py: py,
[INFO] [stderr]     |                         ^^^^^^ help: replace it with: `py`
[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/module.rs:89:17
[INFO] [stderr]    |
[INFO] [stderr] 89 |                 mutability: mutability,
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `mutability`
[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/module.rs:90:17
[INFO] [stderr]    |
[INFO] [stderr] 90 |                 by_ref: by_ref,
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^ help: replace it with: `by_ref`
[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/method.rs:103:25
[INFO] [stderr]     |
[INFO] [stderr] 103 |                         ty: ty,
[INFO] [stderr]     |                         ^^^^^^ help: replace it with: `ty`
[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/method.rs:105:25
[INFO] [stderr]     |
[INFO] [stderr] 105 |                         py: py,
[INFO] [stderr]     |                         ^^^^^^ help: replace it with: `py`
[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/module.rs:89:17
[INFO] [stderr]    |
[INFO] [stderr] 89 |                 mutability: mutability,
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `mutability`
[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/module.rs:90:17
[INFO] [stderr]    |
[INFO] [stderr] 90 |                 by_ref: by_ref,
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^ help: replace it with: `by_ref`
[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: this `else { if .. }` block can be collapsed
[INFO] [stderr]   --> src/args.rs:67:32
[INFO] [stderr]    |
[INFO] [stderr] 67 |                           } else {
[INFO] [stderr]    |  ________________________________^
[INFO] [stderr] 68 | |                             if has_varargs {
[INFO] [stderr] 69 | |                                 arguments
[INFO] [stderr] 70 | |                                     .push(Argument::Kwarg(nv.ident.clone(), litstr.value().clone()))
[INFO] [stderr] ...  |
[INFO] [stderr] 84 | |                             }
[INFO] [stderr] 85 | |                         }
[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] 67 |                         } else if has_varargs {
[INFO] [stderr] 68 |     arguments
[INFO] [stderr] 69 |         .push(Argument::Kwarg(nv.ident.clone(), litstr.value().clone()))
[INFO] [stderr] 70 | } else {
[INFO] [stderr] 71 |     if has_kwargs {
[INFO] [stderr] 72 |         println!(
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/py_class.rs:349:5
[INFO] [stderr]     |
[INFO] [stderr] 349 |     return false;
[INFO] [stderr]     |     ^^^^^^^^^^^^^ help: remove `return` as shown: `false`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: this `else { if .. }` block can be collapsed
[INFO] [stderr]    --> src/py_method.rs:497:12
[INFO] [stderr]     |
[INFO] [stderr] 497 |       } else {
[INFO] [stderr]     |  ____________^
[INFO] [stderr] 498 | |         if let Some(_) = arg.optional {
[INFO] [stderr] 499 | |             // default value
[INFO] [stderr] 500 | |             let mut default = TokenStream::new();
[INFO] [stderr] ...   |
[INFO] [stderr] 554 | |         }
[INFO] [stderr] 555 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[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] 497 |     } else if let Some(_) = arg.optional {
[INFO] [stderr] 498 |     // default value
[INFO] [stderr] 499 |     let mut default = TokenStream::new();
[INFO] [stderr] 500 |     if let Some(d) = spec.default_value(name) {
[INFO] [stderr] 501 |         let dt = quote! { Some(#d) };
[INFO] [stderr] 502 |         dt.to_tokens(&mut default);
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: this `else { if .. }` block can be collapsed
[INFO] [stderr]   --> src/args.rs:67:32
[INFO] [stderr]    |
[INFO] [stderr] 67 |                           } else {
[INFO] [stderr]    |  ________________________________^
[INFO] [stderr] 68 | |                             if has_varargs {
[INFO] [stderr] 69 | |                                 arguments
[INFO] [stderr] 70 | |                                     .push(Argument::Kwarg(nv.ident.clone(), litstr.value().clone()))
[INFO] [stderr] ...  |
[INFO] [stderr] 84 | |                             }
[INFO] [stderr] 85 | |                         }
[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] 67 |                         } else if has_varargs {
[INFO] [stderr] 68 |     arguments
[INFO] [stderr] 69 |         .push(Argument::Kwarg(nv.ident.clone(), litstr.value().clone()))
[INFO] [stderr] 70 | } else {
[INFO] [stderr] 71 |     if has_kwargs {
[INFO] [stderr] 72 |         println!(
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/py_class.rs:349:5
[INFO] [stderr]     |
[INFO] [stderr] 349 |     return false;
[INFO] [stderr]     |     ^^^^^^^^^^^^^ help: remove `return` as shown: `false`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: this `else { if .. }` block can be collapsed
[INFO] [stderr]    --> src/py_method.rs:497:12
[INFO] [stderr]     |
[INFO] [stderr] 497 |       } else {
[INFO] [stderr]     |  ____________^
[INFO] [stderr] 498 | |         if let Some(_) = arg.optional {
[INFO] [stderr] 499 | |             // default value
[INFO] [stderr] 500 | |             let mut default = TokenStream::new();
[INFO] [stderr] ...   |
[INFO] [stderr] 554 | |         }
[INFO] [stderr] 555 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[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] 497 |     } else if let Some(_) = arg.optional {
[INFO] [stderr] 498 |     // default value
[INFO] [stderr] 499 |     let mut default = TokenStream::new();
[INFO] [stderr] 500 |     if let Some(d) = spec.default_value(name) {
[INFO] [stderr] 501 |         let dt = quote! { Some(#d) };
[INFO] [stderr] 502 |         dt.to_tokens(&mut default);
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/args.rs:134:17
[INFO] [stderr]     |
[INFO] [stderr] 134 | /                 match lit {
[INFO] [stderr] 135 | |                     &syn::Lit::Str(ref lits) => {
[INFO] [stderr] 136 | |                         // #[args("*")]
[INFO] [stderr] 137 | |                         if lits.value() == "*" {
[INFO] [stderr] ...   |
[INFO] [stderr] 166 | |                     }
[INFO] [stderr] 167 | |                 }
[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] 134 |                 match *lit {
[INFO] [stderr] 135 |                     syn::Lit::Str(ref lits) => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: defining a method called `eq` on this type; consider implementing the `std::cmp::PartialEq` trait or choosing a less ambiguous name
[INFO] [stderr]   --> src/func.rs:58:5
[INFO] [stderr]    |
[INFO] [stderr] 58 | /     pub fn eq(&self, name: &str) -> bool {
[INFO] [stderr] 59 | |         match *self {
[INFO] [stderr] 60 | |             MethodProto::Free { name: n, .. } => n == name,
[INFO] [stderr] 61 | |             MethodProto::Unary { name: n, .. } => n == name,
[INFO] [stderr] ...  |
[INFO] [stderr] 67 | |         }
[INFO] [stderr] 68 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::should_implement_trait)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#should_implement_trait
[INFO] [stderr] 
[INFO] [stderr] error: using `clone` on a double-reference; this will copy the reference instead of cloning the inner type
[INFO] [stderr]    --> src/func.rs:374:31
[INFO] [stderr]     |
[INFO] [stderr] 374 |                     let seg = ty.path.segments.last().unwrap().value().clone();
[INFO] [stderr]     |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[deny(clippy::clone_double_ref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_double_ref
[INFO] [stderr] help: try dereferencing it
[INFO] [stderr]     |
[INFO] [stderr] 374 |                     let seg = &(*ty.path.segments.last().unwrap().value()).clone();
[INFO] [stderr]     |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] help: or try being explicit about what type to clone
[INFO] [stderr]     |
[INFO] [stderr] 374 |                     let seg = &syn::PathSegment::clone(ty.path.segments.last().unwrap().value());
[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/func.rs:376:25
[INFO] [stderr]     |
[INFO] [stderr] 376 | /                         match seg.arguments {
[INFO] [stderr] 377 | |                             syn::PathArguments::AngleBracketed(ref data) => {
[INFO] [stderr] 378 | |                                 if let Some(pair) = data.args.last() {
[INFO] [stderr] 379 | |                                     match pair.value() {
[INFO] [stderr] ...   |
[INFO] [stderr] 385 | |                             _ => (),
[INFO] [stderr] 386 | |                         }
[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] 376 |                         if let syn::PathArguments::AngleBracketed(ref data) = seg.arguments {
[INFO] [stderr] 377 |     if let Some(pair) = data.args.last() {
[INFO] [stderr] 378 |         match pair.value() {
[INFO] [stderr] 379 |             syn::GenericArgument::Type(ref ty) => return ty.clone(),
[INFO] [stderr] 380 |             _ => panic!("Option only accepted for concrete types"),
[INFO] [stderr] 381 |         }
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/func.rs:409:5
[INFO] [stderr]     |
[INFO] [stderr] 409 | /     match ty {
[INFO] [stderr] 410 | |         &syn::Type::Path(ref typath) => {
[INFO] [stderr] 411 | |             if let Some(segment) = typath.path.segments.last() {
[INFO] [stderr] 412 | |                 match segment.value().ident.to_string().as_str() {
[INFO] [stderr] ...   |
[INFO] [stderr] 450 | |         _ => panic!("not supported: {:?}", ty),
[INFO] [stderr] 451 | |     };
[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] 409 |     match *ty {
[INFO] [stderr] 410 |         syn::Type::Path(ref typath) => {
[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/func.rs:420:29
[INFO] [stderr]     |
[INFO] [stderr] 420 | /                             match data.args[0] {
[INFO] [stderr] 421 | |                                 syn::GenericArgument::Type(syn::Type::Path(ref typath)) => {
[INFO] [stderr] 422 | |                                     if let Some(segment) = typath.path.segments.last() {
[INFO] [stderr] 423 | |                                         match segment.value().ident.to_string().as_str() {
[INFO] [stderr] ...   |
[INFO] [stderr] 436 | |                                 _ => (),
[INFO] [stderr] 437 | |                             }
[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] 420 |                             if let syn::GenericArgument::Type(syn::Type::Path(ref typath)) = data.args[0] {
[INFO] [stderr] 421 |     if let Some(segment) = typath.path.segments.last() {
[INFO] [stderr] 422 |         match segment.value().ident.to_string().as_str() {
[INFO] [stderr] 423 |             // get T from Option<T>
[INFO] [stderr] 424 |             "Option" => match segment.value().arguments {
[INFO] [stderr] 425 |                 syn::PathArguments::AngleBracketed(ref data) => {
[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/func.rs:423:41
[INFO] [stderr]     |
[INFO] [stderr] 423 | /                                         match segment.value().ident.to_string().as_str() {
[INFO] [stderr] 424 | |                                             // get T from Option<T>
[INFO] [stderr] 425 | |                                             "Option" => match segment.value().arguments {
[INFO] [stderr] 426 | |                                                 syn::PathArguments::AngleBracketed(ref data) => {
[INFO] [stderr] ...   |
[INFO] [stderr] 432 | |                                             _ => (),
[INFO] [stderr] 433 | |                                         }
[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] 423 |                                         if let "Option" = segment.value().ident.to_string().as_str() { match segment.value().arguments {
[INFO] [stderr] 424 |     syn::PathArguments::AngleBracketed(ref data) => {
[INFO] [stderr] 425 |         result = false;
[INFO] [stderr] 426 |         succ = data.args[0].clone();
[INFO] [stderr] 427 |     }
[INFO] [stderr] 428 |     _ => (),
[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/func.rs:425:57
[INFO] [stderr]     |
[INFO] [stderr] 425 |                                               "Option" => match segment.value().arguments {
[INFO] [stderr]     |  _________________________________________________________^
[INFO] [stderr] 426 | |                                                 syn::PathArguments::AngleBracketed(ref data) => {
[INFO] [stderr] 427 | |                                                     result = false;
[INFO] [stderr] 428 | |                                                     succ = data.args[0].clone();
[INFO] [stderr] 429 | |                                                 }
[INFO] [stderr] 430 | |                                                 _ => (),
[INFO] [stderr] 431 | |                                             },
[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] 425 |                                             "Option" => if let syn::PathArguments::AngleBracketed(ref data) = segment.value().arguments {
[INFO] [stderr] 426 |     result = false;
[INFO] [stderr] 427 |     succ = data.args[0].clone();
[INFO] [stderr] 428 | },
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error: using `clone` on a double-reference; this will copy the reference instead of cloning the inner type
[INFO] [stderr]    --> src/func.rs:476:27
[INFO] [stderr]     |
[INFO] [stderr] 476 |                 let seg = typath.path.segments.last().unwrap().value().clone();
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_double_ref
[INFO] [stderr] help: try dereferencing it
[INFO] [stderr]     |
[INFO] [stderr] 476 |                 let seg = &(*typath.path.segments.last().unwrap().value()).clone();
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] help: or try being explicit about what type to clone
[INFO] [stderr]     |
[INFO] [stderr] 476 |                 let seg = &syn::PathSegment::clone(typath.path.segments.last().unwrap().value());
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/method.rs:60:13
[INFO] [stderr]     |
[INFO] [stderr] 60  | /             match input {
[INFO] [stderr] 61  | |                 &syn::FnArg::SelfRef(_) => {
[INFO] [stderr] 62  | |                     has_self = true;
[INFO] [stderr] 63  | |                 }
[INFO] [stderr] ...   |
[INFO] [stderr] 110 | |                 &syn::FnArg::Inferred(_) => panic!("ingerred argument: {:?}", name),
[INFO] [stderr] 111 | |             }
[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] 60  |             match *input {
[INFO] [stderr] 61  |                 syn::FnArg::SelfRef(_) => {
[INFO] [stderr] 62  |                     has_self = true;
[INFO] [stderr] 63  |                 }
[INFO] [stderr] 64  |                 syn::FnArg::SelfValue(_) => {
[INFO] [stderr] 65  |                     has_self = true;
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/method.rs:76:55
[INFO] [stderr]    |
[INFO] [stderr] 76 |                       let (ident, by_ref, mutability) = match pat {
[INFO] [stderr]    |  _______________________________________________________^
[INFO] [stderr] 77 | |                         &syn::Pat::Ident(syn::PatIdent {
[INFO] [stderr] 78 | |                             ref ident,
[INFO] [stderr] 79 | |                             ref by_ref,
[INFO] [stderr] ...  |
[INFO] [stderr] 83 | |                         _ => panic!("unsupported argument: {:?}", pat),
[INFO] [stderr] 84 | |                     };
[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] 76 |                     let (ident, by_ref, mutability) = match *pat {
[INFO] [stderr] 77 |                         syn::Pat::Ident(syn::PatIdent {
[INFO] [stderr] 78 |                             ref ident,
[INFO] [stderr] 79 |                             ref by_ref,
[INFO] [stderr] 80 |                             ref mutability,
[INFO] [stderr] 81 |                             ..
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/method.rs:86:30
[INFO] [stderr]    |
[INFO] [stderr] 86 |                       let py = match ty {
[INFO] [stderr]    |  ______________________________^
[INFO] [stderr] 87 | |                         &syn::Type::Path(syn::TypePath { ref path, .. }) => {
[INFO] [stderr] 88 | |                             if let Some(segment) = path.segments.last() {
[INFO] [stderr] 89 | |                                 segment.value().ident == "Python"
[INFO] [stderr] ...  |
[INFO] [stderr] 94 | |                         _ => false,
[INFO] [stderr] 95 | |                     };
[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] 86 |                     let py = match *ty {
[INFO] [stderr] 87 |                         syn::Type::Path(syn::TypePath { ref path, .. }) => {
[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/method.rs:126:13
[INFO] [stderr]     |
[INFO] [stderr] 126 | /             match *s {
[INFO] [stderr] 127 | |                 Argument::VarArgs(ref ident) => return name == ident,
[INFO] [stderr] 128 | |                 _ => (),
[INFO] [stderr] 129 | |             }
[INFO] [stderr]     | |_____________^ help: try this: `if let Argument::VarArgs(ref ident) = *s { return name == ident }`
[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/method.rs:147:13
[INFO] [stderr]     |
[INFO] [stderr] 147 | /             match *s {
[INFO] [stderr] 148 | |                 Argument::KeywordArgs(ref ident) => return name == ident,
[INFO] [stderr] 149 | |                 _ => (),
[INFO] [stderr] 150 | |             }
[INFO] [stderr]     | |_____________^ help: try this: `if let Argument::KeywordArgs(ref ident) = *s { return name == ident }`
[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/method.rs:157:13
[INFO] [stderr]     |
[INFO] [stderr] 157 | /             match *s {
[INFO] [stderr] 158 | |                 Argument::KeywordArgs(_) => return true,
[INFO] [stderr] 159 | |                 _ => (),
[INFO] [stderr] 160 | |             }
[INFO] [stderr]     | |_____________^ help: try this: `if let Argument::KeywordArgs(_) = *s { return true }`
[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 don't need to add `&` to all patterns
[INFO] [stderr]    --> src/method.rs:170:25
[INFO] [stderr]     |
[INFO] [stderr] 170 | /                         if let &Some(ref val) = opt {
[INFO] [stderr] 171 | |                             let i: syn::Expr = syn::parse_str(&val).unwrap();
[INFO] [stderr] 172 | |                             return Some(i.into_token_stream());
[INFO] [stderr] 173 | |                         }
[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] 170 |                         if let Some(ref val) = *opt {
[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/method.rs:190:13
[INFO] [stderr]     |
[INFO] [stderr] 190 | /             match *s {
[INFO] [stderr] 191 | |                 Argument::Kwarg(ref ident, _) => {
[INFO] [stderr] 192 | |                     if ident == name {
[INFO] [stderr] 193 | |                         return true;
[INFO] [stderr] ...   |
[INFO] [stderr] 196 | |                 _ => (),
[INFO] [stderr] 197 | |             }
[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] 190 |             if let Argument::Kwarg(ref ident, _) = *s {
[INFO] [stderr] 191 |     if ident == name {
[INFO] [stderr] 192 |         return true;
[INFO] [stderr] 193 |     }
[INFO] [stderr] 194 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/method.rs:204:5
[INFO] [stderr]     |
[INFO] [stderr] 204 | /     match ty {
[INFO] [stderr] 205 | |         &syn::Type::Reference(_) => return true,
[INFO] [stderr] 206 | |         &syn::Type::Path(syn::TypePath { ref path, .. }) => {
[INFO] [stderr] 207 | |             if let Some(segment) = path.segments.last() {
[INFO] [stderr] ...   |
[INFO] [stderr] 233 | |         _ => (),
[INFO] [stderr] 234 | |     }
[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] 204 |     match *ty {
[INFO] [stderr] 205 |         syn::Type::Reference(_) => return true,
[INFO] [stderr] 206 |         syn::Type::Path(syn::TypePath { ref path, .. }) => {
[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/method.rs:208:17
[INFO] [stderr]     |
[INFO] [stderr] 208 | /                 match segment.value().ident.to_string().as_str() {
[INFO] [stderr] 209 | |                     "Option" => match segment.value().arguments {
[INFO] [stderr] 210 | |                         syn::PathArguments::AngleBracketed(ref params) => {
[INFO] [stderr] 211 | |                             if params.args.len() != 1 {
[INFO] [stderr] ...   |
[INFO] [stderr] 229 | |                     _ => (),
[INFO] [stderr] 230 | |                 }
[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] 208 |                 if let "Option" = segment.value().ident.to_string().as_str() { match segment.value().arguments {
[INFO] [stderr] 209 |     syn::PathArguments::AngleBracketed(ref params) => {
[INFO] [stderr] 210 |         if params.args.len() != 1 {
[INFO] [stderr] 211 |             panic!("argument type is not supported by python method: {:?} ({:?}) {:?}",
[INFO] [stderr] 212 |                        name,
[INFO] [stderr] 213 |                        ty,
[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/method.rs:217:29
[INFO] [stderr]     |
[INFO] [stderr] 217 | /                             match &params.args[params.args.len() - 1] {
[INFO] [stderr] 218 | |                                 &syn::GenericArgument::Type(syn::Type::Reference(_)) => return true,
[INFO] [stderr] 219 | |                                 _ => (),
[INFO] [stderr] 220 | |                             }
[INFO] [stderr]     | |_____________________________^ help: try this: `if let &syn::GenericArgument::Type(syn::Type::Reference(_)) = &params.args[params.args.len() - 1] { return true }`
[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 don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/method.rs:217:29
[INFO] [stderr]     |
[INFO] [stderr] 217 | /                             match &params.args[params.args.len() - 1] {
[INFO] [stderr] 218 | |                                 &syn::GenericArgument::Type(syn::Type::Reference(_)) => return true,
[INFO] [stderr] 219 | |                                 _ => (),
[INFO] [stderr] 220 | |                             }
[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: try
[INFO] [stderr]     |
[INFO] [stderr] 217 |                             match params.args[params.args.len() - 1] {
[INFO] [stderr] 218 |                                 syn::GenericArgument::Type(syn::Type::Reference(_)) => return true,
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/method.rs:242:5
[INFO] [stderr]     |
[INFO] [stderr] 242 | /     match ty {
[INFO] [stderr] 243 | |         &syn::Type::Path(syn::TypePath { ref path, .. }) => {
[INFO] [stderr] 244 | |             //if let &Some(ref qs) = qs {
[INFO] [stderr] 245 | |             //    panic!("explicit Self type in a 'qualified path' is not supported: {:?} - {:?}",
[INFO] [stderr] ...   |
[INFO] [stderr] 286 | |         }
[INFO] [stderr] 287 | |     }
[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] 242 |     match *ty {
[INFO] [stderr] 243 |         syn::Type::Path(syn::TypePath { ref path, .. }) => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/method.rs:260:29
[INFO] [stderr]     |
[INFO] [stderr] 260 | /                             match &params.args[0] {
[INFO] [stderr] 261 | |                                     &syn::GenericArgument::Type(ref ty) => Some(ty),
[INFO] [stderr] 262 | |                                     _ => panic!("argument type is not supported by python method: {:?} ({:?}) {:?}",
[INFO] [stderr] 263 | |                                                     name,
[INFO] [stderr] 264 | |                                                     ty,
[INFO] [stderr] 265 | |                                                     path),
[INFO] [stderr] 266 | |                                 }
[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: try
[INFO] [stderr]     |
[INFO] [stderr] 260 |                             match params.args[0] {
[INFO] [stderr] 261 |                                     syn::GenericArgument::Type(ref ty) => Some(ty),
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/module.rs:68:5
[INFO] [stderr]    |
[INFO] [stderr] 68 | /     match input {
[INFO] [stderr] 69 | |         &syn::FnArg::SelfRef(_) | &syn::FnArg::SelfValue(_) => None,
[INFO] [stderr] 70 | |         &syn::FnArg::Captured(ref cap) => {
[INFO] [stderr] 71 | |             let (mutability, by_ref, ident) = match cap.pat {
[INFO] [stderr] ...  |
[INFO] [stderr] 98 | |         &syn::FnArg::Inferred(_) => panic!("inferred argument: {:?}", name),
[INFO] [stderr] 99 | |     }
[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] 68 |     match *input {
[INFO] [stderr] 69 |         syn::FnArg::SelfRef(_) | syn::FnArg::SelfValue(_) => None,
[INFO] [stderr] 70 |         syn::FnArg::Captured(ref cap) => {
[INFO] [stderr] 71 |             let (mutability, by_ref, ident) = match cap.pat {
[INFO] [stderr] 72 |                 syn::Pat::Ident(ref patid) => (&patid.mutability, &patid.by_ref, &patid.ident),
[INFO] [stderr] 73 |                 _ => panic!("unsupported argument: {:?}", cap.pat),
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/py_class.rs:10:58
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub fn build_py_class(class: &mut syn::ItemStruct, attr: &Vec<syn::Expr>) -> TokenStream {
[INFO] [stderr]    |                                                          ^^^^^^^^^^^^^^^ help: change this to: `&[syn::Expr]`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/py_class.rs:46:25
[INFO] [stderr]    |
[INFO] [stderr] 46 | /                         if let &syn::NestedMeta::Meta(ref metaitem) = meta {
[INFO] [stderr] 47 | |                             match metaitem.name().to_string().as_str() {
[INFO] [stderr] 48 | |                                 "get" => {
[INFO] [stderr] 49 | |                                     descs.push(FnType::Getter(None));
[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 |                         if let syn::NestedMeta::Meta(ref metaitem) = *meta {
[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/py_class.rs:341:5
[INFO] [stderr]     |
[INFO] [stderr] 341 | /     match field.ty {
[INFO] [stderr] 342 | |         syn::Type::Path(ref typath) => {
[INFO] [stderr] 343 | |             if let Some(segment) = typath.path.segments.last() {
[INFO] [stderr] 344 | |                 return segment.value().ident.to_string() == "PyToken";
[INFO] [stderr] ...   |
[INFO] [stderr] 347 | |         _ => (),
[INFO] [stderr] 348 | |     }
[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] 341 |     if let syn::Type::Path(ref typath) = field.ty {
[INFO] [stderr] 342 |     if let Some(segment) = typath.path.segments.last() {
[INFO] [stderr] 343 |         return segment.value().ident.to_string() == "PyToken";
[INFO] [stderr] 344 |     }
[INFO] [stderr] 345 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/py_class.rs:344:24
[INFO] [stderr]     |
[INFO] [stderr] 344 |                 return segment.value().ident.to_string() == "PyToken";
[INFO] [stderr]     |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `*segment.value().ident`
[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: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/py_class.rs:353:11
[INFO] [stderr]     |
[INFO] [stderr] 353 |     args: &Vec<syn::Expr>,
[INFO] [stderr]     |           ^^^^^^^^^^^^^^^ help: change this to: `&[syn::Expr]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: this lifetime isn't used in the function definition
[INFO] [stderr]   --> src/py_method.rs:10:22
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub fn gen_py_method<'a>(
[INFO] [stderr]    |                      ^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::extra_unused_lifetimes)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to one
[INFO] [stderr]    --> src/py_method.rs:336:8
[INFO] [stderr]     |
[INFO] [stderr] 336 |     if spec.args.len() < 1 {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `spec.args.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::len_zero)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: You are using an explicit closure for cloning elements
[INFO] [stderr]    --> src/py_method.rs:387:28
[INFO] [stderr]     |
[INFO] [stderr] 387 |       let args: Vec<FnArg> = spec
[INFO] [stderr]     |  ____________________________^
[INFO] [stderr] 388 | |         .args
[INFO] [stderr] 389 | |         .iter()
[INFO] [stderr] 390 | |         .filter(|item| !item.py)
[INFO] [stderr] 391 | |         .map(|item| item.clone())
[INFO] [stderr]     | |_________________________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::map_clone)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_clone
[INFO] [stderr] help: Consider calling the dedicated `cloned` method
[INFO] [stderr]     |
[INFO] [stderr] 387 |     let args: Vec<FnArg> = spec
[INFO] [stderr] 388 |         .args
[INFO] [stderr] 389 |         .iter()
[INFO] [stderr] 390 |         .filter(|item| !item.py).cloned()
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: redundant pattern matching, consider using `is_some()`
[INFO] [stderr]    --> src/py_method.rs:411:30
[INFO] [stderr]     |
[INFO] [stderr] 411 |               let opt = if let Some(_) = arg.optional {
[INFO] [stderr]     |  _______________________-      ^^^^^^^
[INFO] [stderr] 412 | |                 syn::Ident::new("true", Span::call_site())
[INFO] [stderr] 413 | |             } else if let Some(_) = spec.default_value(&arg.name) {
[INFO] [stderr] 414 | |                 syn::Ident::new("true", Span::call_site())
[INFO] [stderr] 415 | |             } else {
[INFO] [stderr] 416 | |                 syn::Ident::new("false", Span::call_site())
[INFO] [stderr] 417 | |             };
[INFO] [stderr]     | |_____________- help: try this: `if arg.optional.is_some()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::redundant_pattern_matching)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stderr] 
[INFO] [stderr] warning: redundant pattern matching, consider using `is_some()`
[INFO] [stderr]    --> src/py_method.rs:413:27
[INFO] [stderr]     |
[INFO] [stderr] 413 |               } else if let Some(_) = spec.default_value(&arg.name) {
[INFO] [stderr]     |  ____________________-      ^^^^^^^
[INFO] [stderr] 414 | |                 syn::Ident::new("true", Span::call_site())
[INFO] [stderr] 415 | |             } else {
[INFO] [stderr] 416 | |                 syn::Ident::new("false", Span::call_site())
[INFO] [stderr] 417 | |             };
[INFO] [stderr]     | |_____________- help: try this: `if spec.default_value(&arg.name).is_some()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stderr] 
[INFO] [stderr] warning: redundant pattern matching, consider using `is_some()`
[INFO] [stderr]    --> src/py_method.rs:498:16
[INFO] [stderr]     |
[INFO] [stderr] 498 |           if let Some(_) = arg.optional {
[INFO] [stderr]     |  _________-      ^^^^^^^
[INFO] [stderr] 499 | |             // default value
[INFO] [stderr] 500 | |             let mut default = TokenStream::new();
[INFO] [stderr] 501 | |             if let Some(d) = spec.default_value(name) {
[INFO] [stderr] ...   |
[INFO] [stderr] 553 | |             }
[INFO] [stderr] 554 | |         }
[INFO] [stderr]     | |_________- help: try this: `if arg.optional.is_some()`
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/args.rs:134:17
[INFO] [stderr]     |
[INFO] [stderr] 134 | /                 match lit {
[INFO] [stderr] 135 | |                     &syn::Lit::Str(ref lits) => {
[INFO] [stderr] 136 | |                         // #[args("*")]
[INFO] [stderr] 137 | |                         if lits.value() == "*" {
[INFO] [stderr] ...   |
[INFO] [stderr] 166 | |                     }
[INFO] [stderr] 167 | |                 }
[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] 134 |                 match *lit {
[INFO] [stderr] 135 |                     syn::Lit::Str(ref lits) => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/py_method.rs:695:13
[INFO] [stderr]     |
[INFO] [stderr] 695 |       let n = if let &Some(ref name) = setter {
[INFO] [stderr]     |  _____________^
[INFO] [stderr] 696 | |         name.to_string()
[INFO] [stderr] 697 | |     } else {
[INFO] [stderr] 698 | |         let n = name.to_string();
[INFO] [stderr] ...   |
[INFO] [stderr] 703 | |         }
[INFO] [stderr] 704 | |     };
[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] 695 |     let n = if let Some(ref name) = *setter {
[INFO] [stderr]     |                    ^^^^^^^^^^^^^^   ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/py_method.rs:725:13
[INFO] [stderr]     |
[INFO] [stderr] 725 |       let n = if let &Some(ref name) = getter {
[INFO] [stderr]     |  _____________^
[INFO] [stderr] 726 | |         name.to_string()
[INFO] [stderr] 727 | |     } else {
[INFO] [stderr] 728 | |         let n = name.to_string();
[INFO] [stderr] ...   |
[INFO] [stderr] 733 | |         }
[INFO] [stderr] 734 | |     };
[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] 725 |     let n = if let Some(ref name) = *getter {
[INFO] [stderr]     |                    ^^^^^^^^^^^^^^   ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: defining a method called `eq` on this type; consider implementing the `std::cmp::PartialEq` trait or choosing a less ambiguous name
[INFO] [stderr]   --> src/func.rs:58:5
[INFO] [stderr]    |
[INFO] [stderr] 58 | /     pub fn eq(&self, name: &str) -> bool {
[INFO] [stderr] 59 | |         match *self {
[INFO] [stderr] 60 | |             MethodProto::Free { name: n, .. } => n == name,
[INFO] [stderr] 61 | |             MethodProto::Unary { name: n, .. } => n == name,
[INFO] [stderr] ...  |
[INFO] [stderr] 67 | |         }
[INFO] [stderr] 68 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::should_implement_trait)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#should_implement_trait
[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/py_proto.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 | /         match iimpl {
[INFO] [stderr] 55 | |             syn::ImplItem::Method(ref mut met) => {
[INFO] [stderr] 56 | |                 for m in proto.methods {
[INFO] [stderr] 57 | |                     if m.eq(met.sig.ident.to_string().as_str()) {
[INFO] [stderr] ...  |
[INFO] [stderr] 88 | |             _ => (),
[INFO] [stderr] 89 | |         }
[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] 54 |         if let syn::ImplItem::Method(ref mut met) = iimpl {
[INFO] [stderr] 55 |     for m in proto.methods {
[INFO] [stderr] 56 |         if m.eq(met.sig.ident.to_string().as_str()) {
[INFO] [stderr] 57 |             impl_method_proto(ty, &mut met.sig, m).to_tokens(&mut tokens);
[INFO] [stderr] 58 |         }
[INFO] [stderr] 59 |     }
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: The function/method `<FnSpec>::parse` doesn't need a mutable reference
[INFO] [stderr]   --> src/py_proto.rs:67:61
[INFO] [stderr]    |
[INFO] [stderr] 67 |                         let fn_spec = FnSpec::parse(&ident, &mut met.sig, &mut met.attrs);
[INFO] [stderr]    |                                                             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::unnecessary_mut_passed)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_mut_passed
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/utils.rs:11:23
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub fn get_doc(attrs: &Vec<syn::Attribute>, null_terminated: bool) -> syn::Lit {
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^^^^^^ help: change this to: `&[syn::Attribute]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: single-character string constant used as pattern
[INFO] [stderr]   --> src/utils.rs:23:47
[INFO] [stderr]    |
[INFO] [stderr] 23 |                     doc.push(if d.starts_with(" ") {
[INFO] [stderr]    |                                               ^^^ help: try using a char instead: `' '`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::single_char_pattern)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `pyo3-derive-backend`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: using `clone` on a double-reference; this will copy the reference instead of cloning the inner type
[INFO] [stderr]    --> src/func.rs:374:31
[INFO] [stderr]     |
[INFO] [stderr] 374 |                     let seg = ty.path.segments.last().unwrap().value().clone();
[INFO] [stderr]     |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[deny(clippy::clone_double_ref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_double_ref
[INFO] [stderr] help: try dereferencing it
[INFO] [stderr]     |
[INFO] [stderr] 374 |                     let seg = &(*ty.path.segments.last().unwrap().value()).clone();
[INFO] [stderr]     |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] help: or try being explicit about what type to clone
[INFO] [stderr]     |
[INFO] [stderr] 374 |                     let seg = &syn::PathSegment::clone(ty.path.segments.last().unwrap().value());
[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/func.rs:376:25
[INFO] [stderr]     |
[INFO] [stderr] 376 | /                         match seg.arguments {
[INFO] [stderr] 377 | |                             syn::PathArguments::AngleBracketed(ref data) => {
[INFO] [stderr] 378 | |                                 if let Some(pair) = data.args.last() {
[INFO] [stderr] 379 | |                                     match pair.value() {
[INFO] [stderr] ...   |
[INFO] [stderr] 385 | |                             _ => (),
[INFO] [stderr] 386 | |                         }
[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] 376 |                         if let syn::PathArguments::AngleBracketed(ref data) = seg.arguments {
[INFO] [stderr] 377 |     if let Some(pair) = data.args.last() {
[INFO] [stderr] 378 |         match pair.value() {
[INFO] [stderr] 379 |             syn::GenericArgument::Type(ref ty) => return ty.clone(),
[INFO] [stderr] 380 |             _ => panic!("Option only accepted for concrete types"),
[INFO] [stderr] 381 |         }
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/func.rs:409:5
[INFO] [stderr]     |
[INFO] [stderr] 409 | /     match ty {
[INFO] [stderr] 410 | |         &syn::Type::Path(ref typath) => {
[INFO] [stderr] 411 | |             if let Some(segment) = typath.path.segments.last() {
[INFO] [stderr] 412 | |                 match segment.value().ident.to_string().as_str() {
[INFO] [stderr] ...   |
[INFO] [stderr] 450 | |         _ => panic!("not supported: {:?}", ty),
[INFO] [stderr] 451 | |     };
[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] 409 |     match *ty {
[INFO] [stderr] 410 |         syn::Type::Path(ref typath) => {
[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/func.rs:420:29
[INFO] [stderr]     |
[INFO] [stderr] 420 | /                             match data.args[0] {
[INFO] [stderr] 421 | |                                 syn::GenericArgument::Type(syn::Type::Path(ref typath)) => {
[INFO] [stderr] 422 | |                                     if let Some(segment) = typath.path.segments.last() {
[INFO] [stderr] 423 | |                                         match segment.value().ident.to_string().as_str() {
[INFO] [stderr] ...   |
[INFO] [stderr] 436 | |                                 _ => (),
[INFO] [stderr] 437 | |                             }
[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] 420 |                             if let syn::GenericArgument::Type(syn::Type::Path(ref typath)) = data.args[0] {
[INFO] [stderr] 421 |     if let Some(segment) = typath.path.segments.last() {
[INFO] [stderr] 422 |         match segment.value().ident.to_string().as_str() {
[INFO] [stderr] 423 |             // get T from Option<T>
[INFO] [stderr] 424 |             "Option" => match segment.value().arguments {
[INFO] [stderr] 425 |                 syn::PathArguments::AngleBracketed(ref data) => {
[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/func.rs:423:41
[INFO] [stderr]     |
[INFO] [stderr] 423 | /                                         match segment.value().ident.to_string().as_str() {
[INFO] [stderr] 424 | |                                             // get T from Option<T>
[INFO] [stderr] 425 | |                                             "Option" => match segment.value().arguments {
[INFO] [stderr] 426 | |                                                 syn::PathArguments::AngleBracketed(ref data) => {
[INFO] [stderr] ...   |
[INFO] [stderr] 432 | |                                             _ => (),
[INFO] [stderr] 433 | |                                         }
[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] 423 |                                         if let "Option" = segment.value().ident.to_string().as_str() { match segment.value().arguments {
[INFO] [stderr] 424 |     syn::PathArguments::AngleBracketed(ref data) => {
[INFO] [stderr] 425 |         result = false;
[INFO] [stderr] 426 |         succ = data.args[0].clone();
[INFO] [stderr] 427 |     }
[INFO] [stderr] 428 |     _ => (),
[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/func.rs:425:57
[INFO] [stderr]     |
[INFO] [stderr] 425 |                                               "Option" => match segment.value().arguments {
[INFO] [stderr]     |  _________________________________________________________^
[INFO] [stderr] 426 | |                                                 syn::PathArguments::AngleBracketed(ref data) => {
[INFO] [stderr] 427 | |                                                     result = false;
[INFO] [stderr] 428 | |                                                     succ = data.args[0].clone();
[INFO] [stderr] 429 | |                                                 }
[INFO] [stderr] 430 | |                                                 _ => (),
[INFO] [stderr] 431 | |                                             },
[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] 425 |                                             "Option" => if let syn::PathArguments::AngleBracketed(ref data) = segment.value().arguments {
[INFO] [stderr] 426 |     result = false;
[INFO] [stderr] 427 |     succ = data.args[0].clone();
[INFO] [stderr] 428 | },
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error: using `clone` on a double-reference; this will copy the reference instead of cloning the inner type
[INFO] [stderr]    --> src/func.rs:476:27
[INFO] [stderr]     |
[INFO] [stderr] 476 |                 let seg = typath.path.segments.last().unwrap().value().clone();
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_double_ref
[INFO] [stderr] help: try dereferencing it
[INFO] [stderr]     |
[INFO] [stderr] 476 |                 let seg = &(*typath.path.segments.last().unwrap().value()).clone();
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] help: or try being explicit about what type to clone
[INFO] [stderr]     |
[INFO] [stderr] 476 |                 let seg = &syn::PathSegment::clone(typath.path.segments.last().unwrap().value());
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/method.rs:60:13
[INFO] [stderr]     |
[INFO] [stderr] 60  | /             match input {
[INFO] [stderr] 61  | |                 &syn::FnArg::SelfRef(_) => {
[INFO] [stderr] 62  | |                     has_self = true;
[INFO] [stderr] 63  | |                 }
[INFO] [stderr] ...   |
[INFO] [stderr] 110 | |                 &syn::FnArg::Inferred(_) => panic!("ingerred argument: {:?}", name),
[INFO] [stderr] 111 | |             }
[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] 60  |             match *input {
[INFO] [stderr] 61  |                 syn::FnArg::SelfRef(_) => {
[INFO] [stderr] 62  |                     has_self = true;
[INFO] [stderr] 63  |                 }
[INFO] [stderr] 64  |                 syn::FnArg::SelfValue(_) => {
[INFO] [stderr] 65  |                     has_self = true;
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/method.rs:76:55
[INFO] [stderr]    |
[INFO] [stderr] 76 |                       let (ident, by_ref, mutability) = match pat {
[INFO] [stderr]    |  _______________________________________________________^
[INFO] [stderr] 77 | |                         &syn::Pat::Ident(syn::PatIdent {
[INFO] [stderr] 78 | |                             ref ident,
[INFO] [stderr] 79 | |                             ref by_ref,
[INFO] [stderr] ...  |
[INFO] [stderr] 83 | |                         _ => panic!("unsupported argument: {:?}", pat),
[INFO] [stderr] 84 | |                     };
[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] 76 |                     let (ident, by_ref, mutability) = match *pat {
[INFO] [stderr] 77 |                         syn::Pat::Ident(syn::PatIdent {
[INFO] [stderr] 78 |                             ref ident,
[INFO] [stderr] 79 |                             ref by_ref,
[INFO] [stderr] 80 |                             ref mutability,
[INFO] [stderr] 81 |                             ..
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/method.rs:86:30
[INFO] [stderr]    |
[INFO] [stderr] 86 |                       let py = match ty {
[INFO] [stderr]    |  ______________________________^
[INFO] [stderr] 87 | |                         &syn::Type::Path(syn::TypePath { ref path, .. }) => {
[INFO] [stderr] 88 | |                             if let Some(segment) = path.segments.last() {
[INFO] [stderr] 89 | |                                 segment.value().ident == "Python"
[INFO] [stderr] ...  |
[INFO] [stderr] 94 | |                         _ => false,
[INFO] [stderr] 95 | |                     };
[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] 86 |                     let py = match *ty {
[INFO] [stderr] 87 |                         syn::Type::Path(syn::TypePath { ref path, .. }) => {
[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/method.rs:126:13
[INFO] [stderr]     |
[INFO] [stderr] 126 | /             match *s {
[INFO] [stderr] 127 | |                 Argument::VarArgs(ref ident) => return name == ident,
[INFO] [stderr] 128 | |                 _ => (),
[INFO] [stderr] 129 | |             }
[INFO] [stderr]     | |_____________^ help: try this: `if let Argument::VarArgs(ref ident) = *s { return name == ident }`
[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/method.rs:147:13
[INFO] [stderr]     |
[INFO] [stderr] 147 | /             match *s {
[INFO] [stderr] 148 | |                 Argument::KeywordArgs(ref ident) => return name == ident,
[INFO] [stderr] 149 | |                 _ => (),
[INFO] [stderr] 150 | |             }
[INFO] [stderr]     | |_____________^ help: try this: `if let Argument::KeywordArgs(ref ident) = *s { return name == ident }`
[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/method.rs:157:13
[INFO] [stderr]     |
[INFO] [stderr] 157 | /             match *s {
[INFO] [stderr] 158 | |                 Argument::KeywordArgs(_) => return true,
[INFO] [stderr] 159 | |                 _ => (),
[INFO] [stderr] 160 | |             }
[INFO] [stderr]     | |_____________^ help: try this: `if let Argument::KeywordArgs(_) = *s { return true }`
[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 don't need to add `&` to all patterns
[INFO] [stderr]    --> src/method.rs:170:25
[INFO] [stderr]     |
[INFO] [stderr] 170 | /                         if let &Some(ref val) = opt {
[INFO] [stderr] 171 | |                             let i: syn::Expr = syn::parse_str(&val).unwrap();
[INFO] [stderr] 172 | |                             return Some(i.into_token_stream());
[INFO] [stderr] 173 | |                         }
[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] 170 |                         if let Some(ref val) = *opt {
[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/method.rs:190:13
[INFO] [stderr]     |
[INFO] [stderr] 190 | /             match *s {
[INFO] [stderr] 191 | |                 Argument::Kwarg(ref ident, _) => {
[INFO] [stderr] 192 | |                     if ident == name {
[INFO] [stderr] 193 | |                         return true;
[INFO] [stderr] ...   |
[INFO] [stderr] 196 | |                 _ => (),
[INFO] [stderr] 197 | |             }
[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] 190 |             if let Argument::Kwarg(ref ident, _) = *s {
[INFO] [stderr] 191 |     if ident == name {
[INFO] [stderr] 192 |         return true;
[INFO] [stderr] 193 |     }
[INFO] [stderr] 194 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/method.rs:204:5
[INFO] [stderr]     |
[INFO] [stderr] 204 | /     match ty {
[INFO] [stderr] 205 | |         &syn::Type::Reference(_) => return true,
[INFO] [stderr] 206 | |         &syn::Type::Path(syn::TypePath { ref path, .. }) => {
[INFO] [stderr] 207 | |             if let Some(segment) = path.segments.last() {
[INFO] [stderr] ...   |
[INFO] [stderr] 233 | |         _ => (),
[INFO] [stderr] 234 | |     }
[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] 204 |     match *ty {
[INFO] [stderr] 205 |         syn::Type::Reference(_) => return true,
[INFO] [stderr] 206 |         syn::Type::Path(syn::TypePath { ref path, .. }) => {
[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/method.rs:208:17
[INFO] [stderr]     |
[INFO] [stderr] 208 | /                 match segment.value().ident.to_string().as_str() {
[INFO] [stderr] 209 | |                     "Option" => match segment.value().arguments {
[INFO] [stderr] 210 | |                         syn::PathArguments::AngleBracketed(ref params) => {
[INFO] [stderr] 211 | |                             if params.args.len() != 1 {
[INFO] [stderr] ...   |
[INFO] [stderr] 229 | |                     _ => (),
[INFO] [stderr] 230 | |                 }
[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] 208 |                 if let "Option" = segment.value().ident.to_string().as_str() { match segment.value().arguments {
[INFO] [stderr] 209 |     syn::PathArguments::AngleBracketed(ref params) => {
[INFO] [stderr] 210 |         if params.args.len() != 1 {
[INFO] [stderr] 211 |             panic!("argument type is not supported by python method: {:?} ({:?}) {:?}",
[INFO] [stderr] 212 |                        name,
[INFO] [stderr] 213 |                        ty,
[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/method.rs:217:29
[INFO] [stderr]     |
[INFO] [stderr] 217 | /                             match &params.args[params.args.len() - 1] {
[INFO] [stderr] 218 | |                                 &syn::GenericArgument::Type(syn::Type::Reference(_)) => return true,
[INFO] [stderr] 219 | |                                 _ => (),
[INFO] [stderr] 220 | |                             }
[INFO] [stderr]     | |_____________________________^ help: try this: `if let &syn::GenericArgument::Type(syn::Type::Reference(_)) = &params.args[params.args.len() - 1] { return true }`
[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 don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/method.rs:217:29
[INFO] [stderr]     |
[INFO] [stderr] 217 | /                             match &params.args[params.args.len() - 1] {
[INFO] [stderr] 218 | |                                 &syn::GenericArgument::Type(syn::Type::Reference(_)) => return true,
[INFO] [stderr] 219 | |                                 _ => (),
[INFO] [stderr] 220 | |                             }
[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: try
[INFO] [stderr]     |
[INFO] [stderr] 217 |                             match params.args[params.args.len() - 1] {
[INFO] [stderr] 218 |                                 syn::GenericArgument::Type(syn::Type::Reference(_)) => return true,
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/method.rs:242:5
[INFO] [stderr]     |
[INFO] [stderr] 242 | /     match ty {
[INFO] [stderr] 243 | |         &syn::Type::Path(syn::TypePath { ref path, .. }) => {
[INFO] [stderr] 244 | |             //if let &Some(ref qs) = qs {
[INFO] [stderr] 245 | |             //    panic!("explicit Self type in a 'qualified path' is not supported: {:?} - {:?}",
[INFO] [stderr] ...   |
[INFO] [stderr] 286 | |         }
[INFO] [stderr] 287 | |     }
[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] 242 |     match *ty {
[INFO] [stderr] 243 |         syn::Type::Path(syn::TypePath { ref path, .. }) => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/method.rs:260:29
[INFO] [stderr]     |
[INFO] [stderr] 260 | /                             match &params.args[0] {
[INFO] [stderr] 261 | |                                     &syn::GenericArgument::Type(ref ty) => Some(ty),
[INFO] [stderr] 262 | |                                     _ => panic!("argument type is not supported by python method: {:?} ({:?}) {:?}",
[INFO] [stderr] 263 | |                                                     name,
[INFO] [stderr] 264 | |                                                     ty,
[INFO] [stderr] 265 | |                                                     path),
[INFO] [stderr] 266 | |                                 }
[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: try
[INFO] [stderr]     |
[INFO] [stderr] 260 |                             match params.args[0] {
[INFO] [stderr] 261 |                                     syn::GenericArgument::Type(ref ty) => Some(ty),
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/module.rs:68:5
[INFO] [stderr]    |
[INFO] [stderr] 68 | /     match input {
[INFO] [stderr] 69 | |         &syn::FnArg::SelfRef(_) | &syn::FnArg::SelfValue(_) => None,
[INFO] [stderr] 70 | |         &syn::FnArg::Captured(ref cap) => {
[INFO] [stderr] 71 | |             let (mutability, by_ref, ident) = match cap.pat {
[INFO] [stderr] ...  |
[INFO] [stderr] 98 | |         &syn::FnArg::Inferred(_) => panic!("inferred argument: {:?}", name),
[INFO] [stderr] 99 | |     }
[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] 68 |     match *input {
[INFO] [stderr] 69 |         syn::FnArg::SelfRef(_) | syn::FnArg::SelfValue(_) => None,
[INFO] [stderr] 70 |         syn::FnArg::Captured(ref cap) => {
[INFO] [stderr] 71 |             let (mutability, by_ref, ident) = match cap.pat {
[INFO] [stderr] 72 |                 syn::Pat::Ident(ref patid) => (&patid.mutability, &patid.by_ref, &patid.ident),
[INFO] [stderr] 73 |                 _ => panic!("unsupported argument: {:?}", cap.pat),
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/py_class.rs:10:58
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub fn build_py_class(class: &mut syn::ItemStruct, attr: &Vec<syn::Expr>) -> TokenStream {
[INFO] [stderr]    |                                                          ^^^^^^^^^^^^^^^ help: change this to: `&[syn::Expr]`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/py_class.rs:46:25
[INFO] [stderr]    |
[INFO] [stderr] 46 | /                         if let &syn::NestedMeta::Meta(ref metaitem) = meta {
[INFO] [stderr] 47 | |                             match metaitem.name().to_string().as_str() {
[INFO] [stderr] 48 | |                                 "get" => {
[INFO] [stderr] 49 | |                                     descs.push(FnType::Getter(None));
[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 |                         if let syn::NestedMeta::Meta(ref metaitem) = *meta {
[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/py_class.rs:341:5
[INFO] [stderr]     |
[INFO] [stderr] 341 | /     match field.ty {
[INFO] [stderr] 342 | |         syn::Type::Path(ref typath) => {
[INFO] [stderr] 343 | |             if let Some(segment) = typath.path.segments.last() {
[INFO] [stderr] 344 | |                 return segment.value().ident.to_string() == "PyToken";
[INFO] [stderr] ...   |
[INFO] [stderr] 347 | |         _ => (),
[INFO] [stderr] 348 | |     }
[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] 341 |     if let syn::Type::Path(ref typath) = field.ty {
[INFO] [stderr] 342 |     if let Some(segment) = typath.path.segments.last() {
[INFO] [stderr] 343 |         return segment.value().ident.to_string() == "PyToken";
[INFO] [stderr] 344 |     }
[INFO] [stderr] 345 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/py_class.rs:344:24
[INFO] [stderr]     |
[INFO] [stderr] 344 |                 return segment.value().ident.to_string() == "PyToken";
[INFO] [stderr]     |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `*segment.value().ident`
[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: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/py_class.rs:353:11
[INFO] [stderr]     |
[INFO] [stderr] 353 |     args: &Vec<syn::Expr>,
[INFO] [stderr]     |           ^^^^^^^^^^^^^^^ help: change this to: `&[syn::Expr]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: this lifetime isn't used in the function definition
[INFO] [stderr]   --> src/py_method.rs:10:22
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub fn gen_py_method<'a>(
[INFO] [stderr]    |                      ^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::extra_unused_lifetimes)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to one
[INFO] [stderr]    --> src/py_method.rs:336:8
[INFO] [stderr]     |
[INFO] [stderr] 336 |     if spec.args.len() < 1 {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `spec.args.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::len_zero)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: You are using an explicit closure for cloning elements
[INFO] [stderr]    --> src/py_method.rs:387:28
[INFO] [stderr]     |
[INFO] [stderr] 387 |       let args: Vec<FnArg> = spec
[INFO] [stderr]     |  ____________________________^
[INFO] [stderr] 388 | |         .args
[INFO] [stderr] 389 | |         .iter()
[INFO] [stderr] 390 | |         .filter(|item| !item.py)
[INFO] [stderr] 391 | |         .map(|item| item.clone())
[INFO] [stderr]     | |_________________________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::map_clone)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_clone
[INFO] [stderr] help: Consider calling the dedicated `cloned` method
[INFO] [stderr]     |
[INFO] [stderr] 387 |     let args: Vec<FnArg> = spec
[INFO] [stderr] 388 |         .args
[INFO] [stderr] 389 |         .iter()
[INFO] [stderr] 390 |         .filter(|item| !item.py).cloned()
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: redundant pattern matching, consider using `is_some()`
[INFO] [stderr]    --> src/py_method.rs:411:30
[INFO] [stderr]     |
[INFO] [stderr] 411 |               let opt = if let Some(_) = arg.optional {
[INFO] [stderr]     |  _______________________-      ^^^^^^^
[INFO] [stderr] 412 | |                 syn::Ident::new("true", Span::call_site())
[INFO] [stderr] 413 | |             } else if let Some(_) = spec.default_value(&arg.name) {
[INFO] [stderr] 414 | |                 syn::Ident::new("true", Span::call_site())
[INFO] [stderr] 415 | |             } else {
[INFO] [stderr] 416 | |                 syn::Ident::new("false", Span::call_site())
[INFO] [stderr] 417 | |             };
[INFO] [stderr]     | |_____________- help: try this: `if arg.optional.is_some()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::redundant_pattern_matching)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stderr] 
[INFO] [stderr] warning: redundant pattern matching, consider using `is_some()`
[INFO] [stderr]    --> src/py_method.rs:413:27
[INFO] [stderr]     |
[INFO] [stderr] 413 |               } else if let Some(_) = spec.default_value(&arg.name) {
[INFO] [stderr]     |  ____________________-      ^^^^^^^
[INFO] [stderr] 414 | |                 syn::Ident::new("true", Span::call_site())
[INFO] [stderr] 415 | |             } else {
[INFO] [stderr] 416 | |                 syn::Ident::new("false", Span::call_site())
[INFO] [stderr] 417 | |             };
[INFO] [stderr]     | |_____________- help: try this: `if spec.default_value(&arg.name).is_some()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stderr] 
[INFO] [stderr] warning: redundant pattern matching, consider using `is_some()`
[INFO] [stderr]    --> src/py_method.rs:498:16
[INFO] [stderr]     |
[INFO] [stderr] 498 |           if let Some(_) = arg.optional {
[INFO] [stderr]     |  _________-      ^^^^^^^
[INFO] [stderr] 499 | |             // default value
[INFO] [stderr] 500 | |             let mut default = TokenStream::new();
[INFO] [stderr] 501 | |             if let Some(d) = spec.default_value(name) {
[INFO] [stderr] ...   |
[INFO] [stderr] 553 | |             }
[INFO] [stderr] 554 | |         }
[INFO] [stderr]     | |_________- help: try this: `if arg.optional.is_some()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/py_method.rs:695:13
[INFO] [stderr]     |
[INFO] [stderr] 695 |       let n = if let &Some(ref name) = setter {
[INFO] [stderr]     |  _____________^
[INFO] [stderr] 696 | |         name.to_string()
[INFO] [stderr] 697 | |     } else {
[INFO] [stderr] 698 | |         let n = name.to_string();
[INFO] [stderr] ...   |
[INFO] [stderr] 703 | |         }
[INFO] [stderr] 704 | |     };
[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] 695 |     let n = if let Some(ref name) = *setter {
[INFO] [stderr]     |                    ^^^^^^^^^^^^^^   ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/py_method.rs:725:13
[INFO] [stderr]     |
[INFO] [stderr] 725 |       let n = if let &Some(ref name) = getter {
[INFO] [stderr]     |  _____________^
[INFO] [stderr] 726 | |         name.to_string()
[INFO] [stderr] 727 | |     } else {
[INFO] [stderr] 728 | |         let n = name.to_string();
[INFO] [stderr] ...   |
[INFO] [stderr] 733 | |         }
[INFO] [stderr] 734 | |     };
[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] 725 |     let n = if let Some(ref name) = *getter {
[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/py_proto.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 | /         match iimpl {
[INFO] [stderr] 55 | |             syn::ImplItem::Method(ref mut met) => {
[INFO] [stderr] 56 | |                 for m in proto.methods {
[INFO] [stderr] 57 | |                     if m.eq(met.sig.ident.to_string().as_str()) {
[INFO] [stderr] ...  |
[INFO] [stderr] 88 | |             _ => (),
[INFO] [stderr] 89 | |         }
[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] 54 |         if let syn::ImplItem::Method(ref mut met) = iimpl {
[INFO] [stderr] 55 |     for m in proto.methods {
[INFO] [stderr] 56 |         if m.eq(met.sig.ident.to_string().as_str()) {
[INFO] [stderr] 57 |             impl_method_proto(ty, &mut met.sig, m).to_tokens(&mut tokens);
[INFO] [stderr] 58 |         }
[INFO] [stderr] 59 |     }
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: The function/method `<FnSpec>::parse` doesn't need a mutable reference
[INFO] [stderr]   --> src/py_proto.rs:67:61
[INFO] [stderr]    |
[INFO] [stderr] 67 |                         let fn_spec = FnSpec::parse(&ident, &mut met.sig, &mut met.attrs);
[INFO] [stderr]    |                                                             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::unnecessary_mut_passed)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_mut_passed
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/utils.rs:11:23
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub fn get_doc(attrs: &Vec<syn::Attribute>, null_terminated: bool) -> syn::Lit {
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^^^^^^ help: change this to: `&[syn::Attribute]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: single-character string constant used as pattern
[INFO] [stderr]   --> src/utils.rs:23:47
[INFO] [stderr]    |
[INFO] [stderr] 23 |                     doc.push(if d.starts_with(" ") {
[INFO] [stderr]    |                                               ^^^ help: try using a char instead: `' '`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::single_char_pattern)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `pyo3-derive-backend`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "833753d2c1d016235723dae6479c6cdb7d4c813159dcbc42e56b98667d7ac3b1"`
[INFO] running `"docker" "rm" "-f" "833753d2c1d016235723dae6479c6cdb7d4c813159dcbc42e56b98667d7ac3b1"`
[INFO] [stdout] 833753d2c1d016235723dae6479c6cdb7d4c813159dcbc42e56b98667d7ac3b1