Fix dataclass inference for marshmallow_dataclass (#1298)

ChangeLog

@@ -33,6 +33,9 @@ Release date: TBA
 
   Closes PyCQA/pylint#5461
 
+* Enable inference of dataclass import from marshmallow_dataclass.
+  This allows the dataclasses brain to recognize dataclasses annotated by marshmallow_dataclass.
+
 
 What's New in astroid 2.9.0?
 ============================

astroid/brain/brain_dataclasses.py

@@ -3,9 +3,12 @@
 """
 Astroid hook for the dataclasses library
 
-Support both built-in dataclasses and pydantic.dataclasses. References:
+Support built-in dataclasses, pydantic.dataclasses, and marshmallow_dataclass-annotated
+dataclasses. References:
 - https://docs.python.org/3/library/dataclasses.html
 - https://pydantic-docs.helpmanual.io/usage/dataclasses/
+- https://lovasoa.github.io/marshmallow_dataclass/
+
 """
 from typing import FrozenSet, Generator, List, Optional, Tuple
 
@@ -35,7 +38,9 @@
 
 DATACLASSES_DECORATORS = frozenset(("dataclass",))
 FIELD_NAME = "field"
-DATACLASS_MODULES = frozenset(("dataclasses", "pydantic.dataclasses"))
+DATACLASS_MODULES = frozenset(
+    ("dataclasses", "marshmallow_dataclass", "pydantic.dataclasses")
+)
 DEFAULT_FACTORY = "_HAS_DEFAULT_FACTORY"  # based on typing.py
 
 

tests/unittest_brain_dataclasses.py

@@ -11,7 +11,7 @@
 
 
 parametrize_module = pytest.mark.parametrize(
-    ("module",), (["dataclasses"], ["pydantic.dataclasses"])
+    ("module",), (["dataclasses"], ["pydantic.dataclasses"], ["marshmallow_dataclass"])
 )
 
 
@@ -304,6 +304,8 @@ class A:
         ("dataclasses", "typing"),
         ("pydantic.dataclasses", "typing"),
         ("pydantic.dataclasses", "collections.abc"),
+        ("marshmallow_dataclass", "typing"),
+        ("marshmallow_dataclass", "collections.abc"),
     ],
 )
 def test_inference_callable_attribute(module: str, typing_module: str):