Add more lints

.cargo/config

@@ -15,4 +15,7 @@ rustflags = [
     "-Dclippy::todo",
     "-Dclippy::unnecessary_wraps",
     "-Dclippy::useless_transmute",
+    "-Delided_lifetimes_in_paths",
+    "-Dunused_lifetimes",
+    "-Drust_2021_prelude_collisions"
 ]

README.md

@@ -86,7 +86,7 @@ fn sum_as_string(a: usize, b: usize) -> PyResult<String> {
 /// the `lib.name` setting in the `Cargo.toml`, else Python will not be able to
 /// import the module.
 #[pymodule]
-fn string_sum(_py: Python, m: &PyModule) -> PyResult<()> {
+fn string_sum(_py: Python<'_>, m: &PyModule) -> PyResult<()> {
     m.add_function(wrap_pyfunction!(sum_as_string, m)?)?;
     Ok(())
 }

benches/bench_call.rs

@@ -8,7 +8,7 @@ macro_rules! test_module {
     };
 }
 
-fn bench_call_0(b: &mut Bencher) {
+fn bench_call_0(b: &mut Bencher<'_>) {
     Python::with_gil(|py| {
         let module = test_module!(py, "def foo(): pass");
 
@@ -22,7 +22,7 @@ fn bench_call_0(b: &mut Bencher) {
     })
 }
 
-fn bench_call_method_0(b: &mut Bencher) {
+fn bench_call_method_0(b: &mut Bencher<'_>) {
     Python::with_gil(|py| {
         let module = test_module!(
             py,

benches/bench_dict.rs

@@ -4,7 +4,7 @@ use pyo3::prelude::*;
 use pyo3::types::IntoPyDict;
 use std::collections::{BTreeMap, HashMap};
 
-fn iter_dict(b: &mut Bencher) {
+fn iter_dict(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 100_000;
@@ -18,14 +18,14 @@ fn iter_dict(b: &mut Bencher) {
     });
 }
 
-fn dict_new(b: &mut Bencher) {
+fn dict_new(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 50_000;
     b.iter(|| (0..LEN as u64).map(|i| (i, i * 2)).into_py_dict(py));
 }
 
-fn dict_get_item(b: &mut Bencher) {
+fn dict_get_item(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 50_000;
@@ -38,15 +38,15 @@ fn dict_get_item(b: &mut Bencher) {
     });
 }
 
-fn extract_hashmap(b: &mut Bencher) {
+fn extract_hashmap(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 100_000;
     let dict = (0..LEN as u64).map(|i| (i, i * 2)).into_py_dict(py);
     b.iter(|| HashMap::<u64, u64>::extract(dict));
 }
 
-fn extract_btreemap(b: &mut Bencher) {
+fn extract_btreemap(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 100_000;
@@ -55,7 +55,7 @@ fn extract_btreemap(b: &mut Bencher) {
 }
 
 #[cfg(feature = "hashbrown")]
-fn extract_hashbrown_map(b: &mut Bencher) {
+fn extract_hashbrown_map(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 100_000;

benches/bench_err.rs

@@ -2,7 +2,7 @@ use criterion::{criterion_group, criterion_main, Bencher, Criterion};
 
 use pyo3::{exceptions::PyValueError, prelude::*};
 
-fn err_new_restore_and_fetch(b: &mut Bencher) {
+fn err_new_restore_and_fetch(b: &mut Bencher<'_>) {
     Python::with_gil(|py| {
         b.iter(|| {
             PyValueError::new_err("some exception message").restore(py);
@@ -11,7 +11,7 @@ fn err_new_restore_and_fetch(b: &mut Bencher) {
     })
 }
 
-fn err_new_without_gil(b: &mut Bencher) {
+fn err_new_without_gil(b: &mut Bencher<'_>) {
     b.iter(|| PyValueError::new_err("some exception message"))
 }
 

benches/bench_frompyobject.rs

@@ -9,7 +9,7 @@ enum ManyTypes {
     String(String),
 }
 
-fn enum_from_pyobject(b: &mut Bencher) {
+fn enum_from_pyobject(b: &mut Bencher<'_>) {
     Python::with_gil(|py| {
         let obj = PyString::new(py, "hello world");
         b.iter(|| {

benches/bench_gil.rs

@@ -2,22 +2,22 @@ use criterion::{criterion_group, criterion_main, BatchSize, Bencher, Criterion};
 
 use pyo3::{prelude::*, GILPool};
 
-fn bench_clean_gilpool_new(b: &mut Bencher) {
+fn bench_clean_gilpool_new(b: &mut Bencher<'_>) {
     Python::with_gil(|_py| {
         b.iter(|| {
             let _ = unsafe { GILPool::new() };
         });
     });
 }
 
-fn bench_clean_acquire_gil(b: &mut Bencher) {
+fn bench_clean_acquire_gil(b: &mut Bencher<'_>) {
     // Acquiring first GIL will also create a "clean" GILPool, so this measures the Python overhead.
     b.iter(|| {
         let _ = Python::acquire_gil();
     });
 }
 
-fn bench_dirty_acquire_gil(b: &mut Bencher) {
+fn bench_dirty_acquire_gil(b: &mut Bencher<'_>) {
     let obj = Python::with_gil(|py| py.None());
     b.iter_batched(
         || {

benches/bench_list.rs

@@ -3,7 +3,7 @@ use criterion::{criterion_group, criterion_main, Bencher, Criterion};
 use pyo3::prelude::*;
 use pyo3::types::PyList;
 
-fn iter_list(b: &mut Bencher) {
+fn iter_list(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 100_000;
@@ -17,14 +17,14 @@ fn iter_list(b: &mut Bencher) {
     });
 }
 
-fn list_new(b: &mut Bencher) {
+fn list_new(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 50_000;
     b.iter(|| PyList::new(py, 0..LEN));
 }
 
-fn list_get_item(b: &mut Bencher) {
+fn list_get_item(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 50_000;
@@ -38,7 +38,7 @@ fn list_get_item(b: &mut Bencher) {
 }
 
 #[cfg(not(Py_LIMITED_API))]
-fn list_get_item_unchecked(b: &mut Bencher) {
+fn list_get_item_unchecked(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 50_000;

benches/bench_pyclass.rs

@@ -26,7 +26,7 @@ impl MyClass {
     }
 }
 
-pub fn first_time_init(b: &mut criterion::Bencher) {
+pub fn first_time_init(b: &mut criterion::Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     b.iter(|| {

benches/bench_pyobject.rs

@@ -2,7 +2,7 @@ use criterion::{criterion_group, criterion_main, Bencher, Criterion};
 
 use pyo3::prelude::*;
 
-fn drop_many_objects(b: &mut Bencher) {
+fn drop_many_objects(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     b.iter(|| {

benches/bench_set.rs

@@ -4,7 +4,7 @@ use pyo3::prelude::*;
 use pyo3::types::PySet;
 use std::collections::{BTreeSet, HashSet};
 
-fn iter_set(b: &mut Bencher) {
+fn iter_set(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 100_000;
@@ -18,15 +18,15 @@ fn iter_set(b: &mut Bencher) {
     });
 }
 
-fn extract_hashset(b: &mut Bencher) {
+fn extract_hashset(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 100_000;
     let set = PySet::new(py, &(0..LEN).collect::<Vec<_>>()).unwrap();
     b.iter(|| HashSet::<u64>::extract(set));
 }
 
-fn extract_btreeset(b: &mut Bencher) {
+fn extract_btreeset(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 100_000;
@@ -35,7 +35,7 @@ fn extract_btreeset(b: &mut Bencher) {
 }
 
 #[cfg(feature = "hashbrown")]
-fn extract_hashbrown_set(b: &mut Bencher) {
+fn extract_hashbrown_set(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 100_000;

benches/bench_tuple.rs

@@ -3,7 +3,7 @@ use criterion::{criterion_group, criterion_main, Bencher, Criterion};
 use pyo3::prelude::*;
 use pyo3::types::PyTuple;
 
-fn iter_tuple(b: &mut Bencher) {
+fn iter_tuple(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 100_000;
@@ -17,14 +17,14 @@ fn iter_tuple(b: &mut Bencher) {
     });
 }
 
-fn tuple_new(b: &mut Bencher) {
+fn tuple_new(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 50_000;
     b.iter(|| PyTuple::new(py, 0..LEN));
 }
 
-fn tuple_get_item(b: &mut Bencher) {
+fn tuple_get_item(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 50_000;
@@ -38,7 +38,7 @@ fn tuple_get_item(b: &mut Bencher) {
 }
 
 #[cfg(not(Py_LIMITED_API))]
-fn tuple_get_item_unchecked(b: &mut Bencher) {
+fn tuple_get_item_unchecked(b: &mut Bencher<'_>) {
     let gil = Python::acquire_gil();
     let py = gil.python();
     const LEN: usize = 50_000;

examples/decorator/src/lib.rs

@@ -29,7 +29,7 @@ impl PyCounter {
     #[args(args = "*", kwargs = "**")]
     fn __call__(
         &mut self,
-        py: Python,
+        py: Python<'_>,
         args: &PyTuple,
         kwargs: Option<&PyDict>,
     ) -> PyResult<Py<PyAny>> {
@@ -48,7 +48,7 @@ impl PyCounter {
 }
 
 #[pymodule]
-pub fn decorator(_py: Python, module: &PyModule) -> PyResult<()> {
+pub fn decorator(_py: Python<'_>, module: &PyModule) -> PyResult<()> {
     module.add_class::<PyCounter>()?;
     Ok(())
 }

examples/maturin-starter/src/lib.rs

@@ -21,7 +21,7 @@ impl ExampleClass {
 
 /// An example module implemented in Rust using PyO3.
 #[pymodule]
-fn maturin_starter(py: Python, m: &PyModule) -> PyResult<()> {
+fn maturin_starter(py: Python<'_>, m: &PyModule) -> PyResult<()> {
     m.add_class::<ExampleClass>()?;
     m.add_wrapped(wrap_pymodule!(submodule))?;
 

examples/maturin-starter/src/submodule.rs

@@ -16,7 +16,7 @@ impl SubmoduleClass {
 }
 
 #[pymodule]
-pub fn submodule(_py: Python, m: &PyModule) -> PyResult<()> {
+pub fn submodule(_py: Python<'_>, m: &PyModule) -> PyResult<()> {
     m.add_class::<SubmoduleClass>()?;
     Ok(())
 }

examples/setuptools-rust-starter/src/lib.rs

@@ -21,7 +21,7 @@ impl ExampleClass {
 
 /// An example module implemented in Rust using PyO3.
 #[pymodule]
-fn _setuptools_rust_starter(py: Python, m: &PyModule) -> PyResult<()> {
+fn _setuptools_rust_starter(py: Python<'_>, m: &PyModule) -> PyResult<()> {
     m.add_class::<ExampleClass>()?;
     m.add_wrapped(wrap_pymodule!(submodule))?;
 

examples/setuptools-rust-starter/src/submodule.rs

@@ -16,7 +16,7 @@ impl SubmoduleClass {
 }
 
 #[pymodule]
-pub fn submodule(_py: Python, m: &PyModule) -> PyResult<()> {
+pub fn submodule(_py: Python<'_>, m: &PyModule) -> PyResult<()> {
     m.add_class::<SubmoduleClass>()?;
     Ok(())
 }

examples/word-count/src/lib.rs

@@ -17,7 +17,7 @@ fn search_sequential(contents: &str, needle: &str) -> usize {
 }
 
 #[pyfunction]
-fn search_sequential_allow_threads(py: Python, contents: &str, needle: &str) -> usize {
+fn search_sequential_allow_threads(py: Python<'_>, contents: &str, needle: &str) -> usize {
     py.allow_threads(|| search_sequential(contents, needle))
 }
 

guide/src/class.md

@@ -113,7 +113,7 @@ The next step is to create the module initializer and add our class to it
 # struct Number(i32);
 #
 #[pymodule]
-fn my_module(_py: Python, m: &PyModule) -> PyResult<()> {
+fn my_module(_py: Python<'_>, m: &PyModule) -> PyResult<()> {
     m.add_class::<Number>()?;
     Ok(())
 }
@@ -267,7 +267,7 @@ impl SubClass {
         (SubClass { val2: 15 }, BaseClass::new())
     }
 
-    fn method2(self_: PyRef<Self>) -> PyResult<usize> {
+    fn method2(self_: PyRef<'_, Self>) -> PyResult<usize> {
         let super_ = self_.as_ref();  // Get &BaseClass
         super_.method().map(|x| x * self_.val2)
     }
@@ -286,9 +286,9 @@ impl SubSubClass {
             .add_subclass(SubSubClass{val3: 20})
     }
 
-    fn method3(self_: PyRef<Self>) -> PyResult<usize> {
+    fn method3(self_: PyRef<'_, Self>) -> PyResult<usize> {
         let v = self_.val3;
-        let super_ = self_.into_super();  // Get PyRef<SubClass>
+        let super_ = self_.into_super();  // Get PyRef<'_, SubClass>
         SubClass::method2(super_).map(|x| x * v)
     }
 }
@@ -323,7 +323,7 @@ impl DictWithCounter {
     fn new() -> Self {
         Self::default()
     }
-    fn set(mut self_: PyRefMut<Self>, key: String, value: &PyAny) -> PyResult<()> {
+    fn set(mut self_: PyRefMut<'_, Self>, key: String, value: &PyAny) -> PyResult<()> {
         self_.counter.entry(key.clone()).or_insert(0);
         let py = self_.py();
         let dict: &PyDict = unsafe { py.from_borrowed_ptr_or_err(self_.as_ptr())? };
@@ -518,7 +518,7 @@ gets injected by the method wrapper, e.g.
 # }
 #[pymethods]
 impl MyClass {
-    fn method2(&self, py: Python) -> PyResult<i32> {
+    fn method2(&self, py: Python<'_>) -> PyResult<i32> {
         Ok(10)
     }
 }
@@ -953,7 +953,7 @@ unsafe impl pyo3::PyTypeInfo for MyClass {
     const MODULE: Option<&'static str> = None;
 
     #[inline]
-    fn type_object_raw(py: pyo3::Python) -> *mut pyo3::ffi::PyTypeObject {
+    fn type_object_raw(py: pyo3::Python<'_>) -> *mut pyo3::ffi::PyTypeObject {
         use pyo3::type_object::LazyStaticType;
         static TYPE_OBJECT: LazyStaticType = LazyStaticType::new();
         TYPE_OBJECT.get_or_init::<Self>(py)
@@ -967,7 +967,7 @@ impl pyo3::pyclass::PyClass for MyClass {
 }
 
 impl pyo3::IntoPy<PyObject> for MyClass {
-    fn into_py(self, py: pyo3::Python) -> pyo3::PyObject {
+    fn into_py(self, py: pyo3::Python<'_>) -> pyo3::PyObject {
         pyo3::IntoPy::into_py(pyo3::Py::new(py, self).unwrap(), py)
     }
 }