B027 ignore @overload decorator

bugbear.py

@@ -666,6 +666,14 @@ def is_abstract_decorator(expr):
                 isinstance(expr, ast.Attribute) and expr.attr[:8] == "abstract"
             )
 
+        def is_overload(expr):
+            return (isinstance(expr, ast.Name) and expr.id == "overload") or (
+                isinstance(expr, ast.Attribute)
+                and isinstance(expr.value, ast.Name)
+                and expr.value.id == "typing"
+                and expr.attr == "overload"
+            )
+
         def empty_body(body) -> bool:
             def is_str_or_ellipsis(node):
                 # ast.Ellipsis and ast.Str used in python<3.8
@@ -709,7 +717,11 @@ def is_str_or_ellipsis(node):
 
             has_abstract_method |= has_abstract_decorator
 
-            if not has_abstract_decorator and empty_body(stmt.body):
+            if (
+                not has_abstract_decorator
+                and empty_body(stmt.body)
+                and not any(map(is_overload, stmt.decorator_list))
+            ):
                 self.errors.append(
                     B027(stmt.lineno, stmt.col_offset, vars=(stmt.name,))
                 )

tests/b027.py

@@ -5,7 +5,7 @@
 
 """
 Should emit:
-B025 - on lines 13, 16, 19, 23, 31
+B027 - on lines 13, 16, 19, 23, 31
 """
 
 
@@ -57,3 +57,22 @@ def empty_1(self):  # safe
 
     def empty_2(self):  # safe
         pass
+
+
+# ignore @overload, fixes issue #304
+import typing
+from typing import Union, overload
+
+
+class AstractClass(ABC):
+    @overload
+    def empty_1(self, foo: str):
+        ...
+
+    @typing.overload
+    def empty_1(self, foo: int):
+        ...
+
+    @abstractmethod
+    def empty_1(self, foo: Union[str, int]):
+        ...