add support for RustPython under posix

pyproject.toml

@@ -94,6 +94,7 @@ entry-points."virtualenv.create".graalpy-posix = "virtualenv.create.via_global_r
 entry-points."virtualenv.create".graalpy-win = "virtualenv.create.via_global_ref.builtin.graalpy:GraalPyWindows"
 entry-points."virtualenv.create".pypy3-posix = "virtualenv.create.via_global_ref.builtin.pypy.pypy3:PyPy3Posix"
 entry-points."virtualenv.create".pypy3-win = "virtualenv.create.via_global_ref.builtin.pypy.pypy3:Pypy3Windows"
+entry-points."virtualenv.create".rustpython-posix = "virtualenv.create.via_global_ref.builtin.rustpython:RustPythonPosix"
 entry-points."virtualenv.create".venv = "virtualenv.create.via_global_ref.venv:Venv"
 entry-points."virtualenv.discovery".builtin = "virtualenv.discovery.builtin:Builtin"
 entry-points."virtualenv.seed".app-data = "virtualenv.seed.embed.via_app_data.via_app_data:FromAppData"

src/virtualenv/create/via_global_ref/builtin/rustpython/__init__.py

@@ -0,0 +1,16 @@
+from __future__ import annotations
+
+from virtualenv.create.via_global_ref.builtin.cpython.cpython3 import CPython3Posix
+
+
+class RustPythonPosix(CPython3Posix):
+    """
+    Creator for RustPython.
+
+    RustPython is mostly compatible with CPython3,
+    so we can reuse cpython creator code.
+    """
+
+    @classmethod
+    def can_describe(cls, interpreter):
+        return interpreter.implementation == "RustPython"

tests/unit/create/via_global_ref/builtin/rustpython/test_rustpython.py

@@ -0,0 +1,19 @@
+from __future__ import annotations
+
+from virtualenv.create.via_global_ref.builtin.rustpython import RustPythonPosix
+from virtualenv.discovery.py_info import PythonInfo
+
+
+def test_can_describe():
+    """
+    Test RustPythonPosix.can_describe() class method.
+    """
+    interpreter = PythonInfo()
+
+    # check that RustPython implementation is supported
+    interpreter.implementation = "RustPython"
+    assert RustPythonPosix.can_describe(interpreter)
+
+    # check that non-RustPython implementation is not supported
+    interpreter.implementation = "CPython"
+    assert not RustPythonPosix.can_describe(interpreter)