rust: support 1.57

CHANGELOG.md

@@ -41,6 +41,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Fix undefined symbol for `PyObject_HasAttr` on PyPy. [#2025](https://github.com/PyO3/pyo3/pull/2025)
 - Fix memory leak in `PyErr::into_value`. [#2026](https://github.com/PyO3/pyo3/pull/2026)
+- Fix clippy warning `needless-option-as-deref` in code generated by `#[pyfunction]` and `#[pymethods]`. [#2040](https://github.com/PyO3/pyo3/pull/2040)
 
 ## [0.15.1] - 2021-11-19
 

pyo3-macros-backend/src/params.rs

@@ -292,6 +292,7 @@ fn impl_arg_param(
 
         Ok(quote_arg_span! {
             let #mut_ _tmp: #target_ty = #arg_value_or_default;
+            #[allow(clippy::needless_option_as_deref)]
             let #arg_name = #borrow_tmp;
         })
     } else {

src/buffer.rs

@@ -163,6 +163,10 @@ fn is_matching_endian(c: u8) -> bool {
 }
 
 /// Trait implemented for possible element types of `PyBuffer`.
+///
+/// # Safety
+///
+/// This trait must only be implemented for types which represent valid elements of Python buffers.
 pub unsafe trait Element: Copy {
     /// Gets whether the element specified in the format string is potentially compatible.
     /// Alignment and size are checked separately from this function.

src/conversion.rs

@@ -463,6 +463,10 @@ impl IntoPy<Py<PyTuple>> for () {
 }
 
 /// Raw level conversion between `*mut ffi::PyObject` and PyO3 types.
+///
+/// # Safety
+///
+/// See safety notes on individual functions.
 pub unsafe trait FromPyPointer<'p>: Sized {
     /// Convert from an arbitrary `PyObject`.
     ///

src/instance.rs

@@ -17,6 +17,10 @@ use std::ptr::NonNull;
 /// PyO3 is designed in a way that all references to those types are bound
 /// to the GIL, which is why you can get a token from all references of those
 /// types.
+///
+/// # Safety
+///
+/// This trait must only be implemented for types which cannot be accessed without the GIL.
 pub unsafe trait PyNativeType: Sized {
     /// Returns a GIL marker constrained to the lifetime of this type.
     #[inline]

src/type_object.rs

@@ -16,6 +16,10 @@ use std::thread::{self, ThreadId};
 /// is of `PyAny`.
 ///
 /// This trait is intended to be used internally.
+///
+/// # Safety
+///
+/// This trait must only be implemented for types which represent valid layouts of Python objects.
 pub unsafe trait PyLayout<T> {}
 
 /// `T: PySizedLayout<U>` represents that `T` is not a instance of
@@ -31,6 +35,11 @@ pub trait PySizedLayout<T>: PyLayout<T> + Sized {}
 ///  - the return value of type_object must always point to the same PyTypeObject instance
 ///
 /// It is safely implemented by the `pyclass` macro.
+///
+/// # Safety
+///
+/// Implementations must provide an implementation for `type_object_raw` which infallibly produces a
+/// non-null pointer to the corresponding Python type object.
 pub unsafe trait PyTypeInfo: Sized {
     /// Class name.
     const NAME: &'static str;
@@ -57,6 +66,8 @@ pub unsafe trait PyTypeInfo: Sized {
 
 /// Python object types that have a corresponding type object.
 ///
+/// # Safety
+///
 /// This trait is marked unsafe because not fulfilling the contract for type_object
 /// leads to UB.
 ///

tests/test_compile_error.rs

@@ -25,15 +25,13 @@ fn _test_compile_errors() {
     t.compile_fail("tests/ui/invalid_pymethods.rs");
     t.compile_fail("tests/ui/invalid_pymethod_names.rs");
     t.compile_fail("tests/ui/invalid_pymodule_args.rs");
-    t.compile_fail("tests/ui/invalid_argument_attributes.rs");
     t.compile_fail("tests/ui/missing_clone.rs");
     t.compile_fail("tests/ui/reject_generics.rs");
-    t.compile_fail("tests/ui/wrong_aspyref_lifetimes.rs");
 
     tests_rust_1_49(&t);
-    tests_rust_1_54(&t);
     tests_rust_1_55(&t);
     tests_rust_1_56(&t);
+    tests_rust_1_57(&t);
 
     #[rustversion::since(1.49)]
     fn tests_rust_1_49(t: &trybuild::TestCases) {
@@ -42,14 +40,6 @@ fn _test_compile_errors() {
     #[rustversion::before(1.49)]
     fn tests_rust_1_49(_t: &trybuild::TestCases) {}
 
-    #[rustversion::since(1.54)]
-    fn tests_rust_1_54(t: &trybuild::TestCases) {
-        t.compile_fail("tests/ui/invalid_frompy_derive.rs");
-        t.compile_fail("tests/ui/static_ref.rs");
-    }
-    #[rustversion::before(1.54)]
-    fn tests_rust_1_54(_t: &trybuild::TestCases) {}
-
     #[rustversion::since(1.55)]
     fn tests_rust_1_55(t: &trybuild::TestCases) {
         t.compile_fail("tests/ui/invalid_pymethod_receiver.rs");
@@ -70,4 +60,15 @@ fn _test_compile_errors() {
 
     #[rustversion::before(1.56)]
     fn tests_rust_1_56(_t: &trybuild::TestCases) {}
+
+    #[rustversion::since(1.57)]
+    fn tests_rust_1_57(t: &trybuild::TestCases) {
+        t.compile_fail("tests/ui/invalid_argument_attributes.rs");
+        t.compile_fail("tests/ui/invalid_frompy_derive.rs");
+        t.compile_fail("tests/ui/static_ref.rs");
+        t.compile_fail("tests/ui/wrong_aspyref_lifetimes.rs");
+    }
+
+    #[rustversion::before(1.57)]
+    fn tests_rust_1_57(_t: &trybuild::TestCases) {}
 }

tests/ui/invalid_argument_attributes.stderr

@@ -5,10 +5,10 @@ error: expected `from_py_with`
   |                             ^^^
 
 error: expected `=`
- --> tests/ui/invalid_argument_attributes.rs:7:32
+ --> tests/ui/invalid_argument_attributes.rs:7:45
   |
 7 | fn from_py_with_no_value(#[pyo3(from_py_with)] param: String) {}
-  |                                ^^^^^^^^^^^^^^
+  |                                             ^
 
 error: expected `from_py_with`
   --> tests/ui/invalid_argument_attributes.rs:10:31

tests/ui/invalid_frompy_derive.stderr

@@ -109,10 +109,10 @@ error: attribute name cannot be empty
    |                      ^^
 
 error: unexpected end of input, expected string literal
-   --> tests/ui/invalid_frompy_derive.rs:100:21
+   --> tests/ui/invalid_frompy_derive.rs:100:22
     |
 100 |     #[pyo3(attribute())]
-    |                     ^^
+    |                      ^
 
 error: expected at most one argument: `item` or `item(key)`
    --> tests/ui/invalid_frompy_derive.rs:106:20
@@ -121,10 +121,10 @@ error: expected at most one argument: `item` or `item(key)`
     |                    ^
 
 error: unexpected end of input, expected literal
-   --> tests/ui/invalid_frompy_derive.rs:112:16
+   --> tests/ui/invalid_frompy_derive.rs:112:17
     |
 112 |     #[pyo3(item())]
-    |                ^^
+    |                 ^
 
 error: only one of `attribute` or `item` can be provided
    --> tests/ui/invalid_frompy_derive.rs:118:5
@@ -171,10 +171,10 @@ error: cannot derive FromPyObject for empty structs and variants
     = note: this error originates in the derive macro `FromPyObject` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: expected `=`
-   --> tests/ui/invalid_frompy_derive.rs:158:11
+   --> tests/ui/invalid_frompy_derive.rs:158:24
     |
 158 |     #[pyo3(from_py_with)]
-    |           ^^^^^^^^^^^^^^
+    |                        ^
 
 error: expected string literal
    --> tests/ui/invalid_frompy_derive.rs:164:27

tests/ui/static_ref.stderr

@@ -4,7 +4,7 @@ error[E0495]: cannot infer an appropriate lifetime for lifetime parameter `'py`
 4 | #[pyfunction]
   | ^^^^^^^^^^^^^
   |
-note: first, the lifetime cannot outlive the anonymous lifetime #1 defined on the body at 4:1...
+note: first, the lifetime cannot outlive the anonymous lifetime #1 defined here...
  --> tests/ui/static_ref.rs:4:1
   |
 4 | #[pyfunction]

tests/ui/wrong_aspyref_lifetimes.stderr

@@ -2,9 +2,9 @@ error[E0505]: cannot move out of `gil` because it is borrowed
  --> tests/ui/wrong_aspyref_lifetimes.rs:7:10
   |
 6 |     let dict: &PyDict = dict.as_ref(gil.python());
-  |                                     --- borrow of `gil` occurs here
+  |                                     ------------ borrow of `gil` occurs here
 7 |     drop(gil);
   |          ^^^ move out of `gil` occurs here
 8 |
 9 |     let _py: Python = dict.py(); // Obtain a Python<'p> without GIL.
-  |                       ---- borrow later used here
+  |                       --------- borrow later used here