Stabilize declarative modules (#4257)

Cargo.toml

@@ -75,9 +75,6 @@ experimental-async = ["macros", "pyo3-macros/experimental-async"]
 # and IntoPy traits
 experimental-inspect = []
 
-# Enables annotating Rust inline modules with #[pymodule] to build Python modules declaratively
-experimental-declarative-modules = ["pyo3-macros/experimental-declarative-modules", "macros"]
-
 # Enables macros: #[pyclass], #[pymodule], #[pyfunction] etc.
 macros = ["pyo3-macros", "indoc", "unindent"]
 
@@ -125,7 +122,6 @@ full = [
     "chrono-tz",
     "either",
     "experimental-async",
-    "experimental-declarative-modules",
     "experimental-inspect",
     "eyre",
     "hashbrown",

guide/src/features.md

@@ -57,12 +57,6 @@ This feature adds support for `async fn` in `#[pyfunction]` and `#[pymethods]`.
 
 The feature has some unfinished refinements and performance improvements. To help finish this off, see [issue #1632](https://github.com/PyO3/pyo3/issues/1632) and its associated draft PRs.
 
-### `experimental-declarative-modules`
-
-This feature allows to declare Python modules using `#[pymodule] mod my_module { ... }` syntax. 
-
-The feature has some unfinished refinements and edge cases. To help finish this off, see [issue #3900](https://github.com/PyO3/pyo3/issues/3900).
-
 ### `experimental-inspect`
 
 This feature adds the `pyo3::inspect` module, as well as `IntoPy::type_output` and `FromPyObject::type_input` APIs to produce Python type "annotations" for Rust types.

guide/src/module.md

@@ -106,14 +106,12 @@ submodules by using `from parent_module import child_module`. For more informati
 
 It is not necessary to add `#[pymodule]` on nested modules, which is only required on the top-level module.
 
-## Declarative modules (experimental)
+## Declarative modules
 
 Another syntax based on Rust inline modules is also available to declare modules.
-The `experimental-declarative-modules` feature must be enabled to use it.
 
 For example:
 ```rust
-# #[cfg(feature = "experimental-declarative-modules")]
 # mod declarative_module_test {
 use pyo3::prelude::*;
 
@@ -157,7 +155,6 @@ For nested modules, the name of the parent module is automatically added.
 In the following example, the `Unit` class will have for `module` `my_extension.submodule` because it is properly nested
 but the `Ext` class will have for `module` the default `builtins` because it not nested.
 ```rust
-# #[cfg(feature = "experimental-declarative-modules")]
 # mod declarative_module_module_attr_test {
 use pyo3::prelude::*;
 
@@ -184,7 +181,3 @@ mod my_extension {
 ```
 It is possible to customize the `module` value for a `#[pymodule]` with the `#[pyo3(module = "MY_MODULE")]` option.
 
-Some changes are planned to this feature before stabilization, like automatically
-filling submodules into `sys.modules` to allow easier imports (see [issue #759](https://github.com/PyO3/pyo3/issues/759)).
-Macro names might also change.
-See [issue #3900](https://github.com/PyO3/pyo3/issues/3900) to track this feature progress.

newsfragments/4257.changed.md

@@ -0,0 +1 @@
+The `experimental-declarative-modules` feature is now stabilized and available by default

pyo3-macros/Cargo.toml

@@ -16,7 +16,6 @@ proc-macro = true
 [features]
 multiple-pymethods = []
 experimental-async = ["pyo3-macros-backend/experimental-async"]
-experimental-declarative-modules = []
 gil-refs = ["pyo3-macros-backend/gil-refs"]
 
 [dependencies]

pyo3-macros/src/lib.rs

@@ -37,14 +37,7 @@ use syn::{parse::Nothing, parse_macro_input, Item};
 pub fn pymodule(args: TokenStream, input: TokenStream) -> TokenStream {
     parse_macro_input!(args as Nothing);
     match parse_macro_input!(input as Item) {
-        Item::Mod(module) => if cfg!(feature = "experimental-declarative-modules") {
+        Item::Mod(module) => pymodule_module_impl(module),
-            pymodule_module_impl(module)
-        } else {
-            Err(syn::Error::new_spanned(
-                module,
-                "#[pymodule] requires the 'experimental-declarative-modules' feature to be used on Rust modules.",
-            ))
-        },
         Item::Fn(function) => pymodule_function_impl(function),
         unsupported => Err(syn::Error::new_spanned(
             unsupported,

tests/test_append_to_inittab.rs

@@ -13,7 +13,6 @@ fn module_fn_with_functions(m: &Bound<'_, PyModule>) -> PyResult<()> {
     Ok(())
 }
 
-#[cfg(feature = "experimental-declarative-modules")]
 #[pymodule]
 mod module_mod_with_functions {
     #[pymodule_export]
@@ -27,7 +26,6 @@ fn test_module_append_to_inittab() {
 
     append_to_inittab!(module_fn_with_functions);
 
-    #[cfg(feature = "experimental-declarative-modules")]
     append_to_inittab!(module_mod_with_functions);
 
     Python::with_gil(|py| {
@@ -43,7 +41,6 @@ assert module_fn_with_functions.foo() == 123
         .unwrap();
     });
 
-    #[cfg(feature = "experimental-declarative-modules")]
     Python::with_gil(|py| {
         py.run_bound(
             r#"

tests/test_compile_error.rs

@@ -52,13 +52,9 @@ fn test_compile_errors() {
     t.compile_fail("tests/ui/not_send2.rs");
     t.compile_fail("tests/ui/get_set_all.rs");
     t.compile_fail("tests/ui/traverse.rs");
-    #[cfg(feature = "experimental-declarative-modules")]
     t.compile_fail("tests/ui/invalid_pymodule_in_root.rs");
-    #[cfg(feature = "experimental-declarative-modules")]
     t.compile_fail("tests/ui/invalid_pymodule_glob.rs");
-    #[cfg(feature = "experimental-declarative-modules")]
     t.compile_fail("tests/ui/invalid_pymodule_trait.rs");
-    #[cfg(feature = "experimental-declarative-modules")]
     t.compile_fail("tests/ui/invalid_pymodule_two_pymodule_init.rs");
     #[cfg(feature = "experimental-async")]
     #[cfg(any(not(Py_LIMITED_API), Py_3_10))] // to avoid PyFunctionArgument for &str

tests/test_declarative_module.rs

@@ -1,4 +1,4 @@
-#![cfg(feature = "experimental-declarative-modules")]
+#![cfg(feature = "macros")]
 
 use pyo3::create_exception;
 use pyo3::exceptions::PyException;

tests/ui/pymodule_missing_docs.rs

@@ -9,7 +9,6 @@ pub fn python_module(_m: &Bound<'_, PyModule>) -> PyResult<()> {
     Ok(())
 }
 
-#[cfg(feature = "experimental-declarative-modules")]
 /// Some module documentation
 #[pymodule]
 pub mod declarative_python_module {}